Taking the address of a field in a packed struct is a bad idea, because
it might not be actually aligned enough for that pointer type (and
thus cause a crash on dereference on some host architectures). Newer
versions of clang warn about this. Avoid the bug by not using the
"modify in place" byte swapping functions.
This patch was produced with the following simple spatch script:
@@
expression E;
@@
-le16_to_cpus(&E);
+E = le16_to_cpu(E);
@@
expression E;
@@
-le32_to_cpus(&E);
+E = le32_to_cpu(E);
@@
expression E;
@@
-le64_to_cpus(&E);
+E = le64_to_cpu(E);
@@
expression E;
@@
-cpu_to_le16s(&E);
+E = cpu_to_le16(E);
@@
expression E;
@@
-cpu_to_le32s(&E);
+E = cpu_to_le32(E);
@@
expression E;
@@
-cpu_to_le64s(&E);
+E = cpu_to_le64(E);
followed by some minor tidying of overlong lines and bad indent.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
NB: tested with qemu-system-x86_64 -cpu host -enable-kvm -m 4096
-device mptsas1068 -drive id=mydisk,if=none,file=harddisk.qcow2
-device scsi-disk,drive=mydisk
which behaves no differently before or after the patch, though
the guest I have (an x86 ubuntu) seems to detect the controller
but not find any disks attached to it. Maybe my command line is wrong?
hw/scsi/mptendian.c | 163 ++++++++++++++++++++++----------------------
1 file changed, 83 insertions(+), 80 deletions(-)
diff --git a/hw/scsi/mptendian.c b/hw/scsi/mptendian.c
index 8ae39a76f42..79f99734d21 100644
--- a/hw/scsi/mptendian.c
+++ b/hw/scsi/mptendian.c
@@ -35,152 +35,155 @@
static void mptsas_fix_sgentry_endianness(MPISGEntry *sge)
{
- le32_to_cpus(&sge->FlagsLength);
+ sge->FlagsLength = le32_to_cpu(sge->FlagsLength);
if (sge->FlagsLength & MPI_SGE_FLAGS_64_BIT_ADDRESSING) {
- le64_to_cpus(&sge->u.Address64);
+ sge->u.Address64 = le64_to_cpu(sge->u.Address64);
} else {
- le32_to_cpus(&sge->u.Address32);
+ sge->u.Address32 = le32_to_cpu(sge->u.Address32);
}
}
static void mptsas_fix_sgentry_endianness_reply(MPISGEntry *sge)
{
if (sge->FlagsLength & MPI_SGE_FLAGS_64_BIT_ADDRESSING) {
- cpu_to_le64s(&sge->u.Address64);
+ sge->u.Address64 = cpu_to_le64(sge->u.Address64);
} else {
- cpu_to_le32s(&sge->u.Address32);
+ sge->u.Address32 = cpu_to_le32(sge->u.Address32);
}
- cpu_to_le32s(&sge->FlagsLength);
+ sge->FlagsLength = cpu_to_le32(sge->FlagsLength);
}
void mptsas_fix_scsi_io_endianness(MPIMsgSCSIIORequest *req)
{
- le32_to_cpus(&req->MsgContext);
- le32_to_cpus(&req->Control);
- le32_to_cpus(&req->DataLength);
- le32_to_cpus(&req->SenseBufferLowAddr);
+ req->MsgContext = le32_to_cpu(req->MsgContext);
+ req->Control = le32_to_cpu(req->Control);
+ req->DataLength = le32_to_cpu(req->DataLength);
+ req->SenseBufferLowAddr = le32_to_cpu(req->SenseBufferLowAddr);
}
void mptsas_fix_scsi_io_reply_endianness(MPIMsgSCSIIOReply *reply)
{
- cpu_to_le32s(&reply->MsgContext);
- cpu_to_le16s(&reply->IOCStatus);
- cpu_to_le32s(&reply->IOCLogInfo);
- cpu_to_le32s(&reply->TransferCount);
- cpu_to_le32s(&reply->SenseCount);
- cpu_to_le32s(&reply->ResponseInfo);
- cpu_to_le16s(&reply->TaskTag);
+ reply->MsgContext = cpu_to_le32(reply->MsgContext);
+ reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
+ reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
+ reply->TransferCount = cpu_to_le32(reply->TransferCount);
+ reply->SenseCount = cpu_to_le32(reply->SenseCount);
+ reply->ResponseInfo = cpu_to_le32(reply->ResponseInfo);
+ reply->TaskTag = cpu_to_le16(reply->TaskTag);
}
void mptsas_fix_scsi_task_mgmt_endianness(MPIMsgSCSITaskMgmt *req)
{
- le32_to_cpus(&req->MsgContext);
- le32_to_cpus(&req->TaskMsgContext);
+ req->MsgContext = le32_to_cpu(req->MsgContext);
+ req->TaskMsgContext = le32_to_cpu(req->TaskMsgContext);
}
void mptsas_fix_scsi_task_mgmt_reply_endianness(MPIMsgSCSITaskMgmtReply *reply)
{
- cpu_to_le32s(&reply->MsgContext);
- cpu_to_le16s(&reply->IOCStatus);
- cpu_to_le32s(&reply->IOCLogInfo);
- cpu_to_le32s(&reply->TerminationCount);
+ reply->MsgContext = cpu_to_le32(reply->MsgContext);
+ reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
+ reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
+ reply->TerminationCount = cpu_to_le32(reply->TerminationCount);
}
void mptsas_fix_ioc_init_endianness(MPIMsgIOCInit *req)
{
- le32_to_cpus(&req->MsgContext);
- le16_to_cpus(&req->ReplyFrameSize);
- le32_to_cpus(&req->HostMfaHighAddr);
- le32_to_cpus(&req->SenseBufferHighAddr);
- le32_to_cpus(&req->ReplyFifoHostSignalingAddr);
+ req->MsgContext = le32_to_cpu(req->MsgContext);
+ req->ReplyFrameSize = le16_to_cpu(req->ReplyFrameSize);
+ req->HostMfaHighAddr = le32_to_cpu(req->HostMfaHighAddr);
+ req->SenseBufferHighAddr = le32_to_cpu(req->SenseBufferHighAddr);
+ req->ReplyFifoHostSignalingAddr =
+ le32_to_cpu(req->ReplyFifoHostSignalingAddr);
mptsas_fix_sgentry_endianness(&req->HostPageBufferSGE);
- le16_to_cpus(&req->MsgVersion);
- le16_to_cpus(&req->HeaderVersion);
+ req->MsgVersion = le16_to_cpu(req->MsgVersion);
+ req->HeaderVersion = le16_to_cpu(req->HeaderVersion);
}
void mptsas_fix_ioc_init_reply_endianness(MPIMsgIOCInitReply *reply)
{
- cpu_to_le32s(&reply->MsgContext);
- cpu_to_le16s(&reply->IOCStatus);
- cpu_to_le32s(&reply->IOCLogInfo);
+ reply->MsgContext = cpu_to_le32(reply->MsgContext);
+ reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
+ reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
}
void mptsas_fix_ioc_facts_endianness(MPIMsgIOCFacts *req)
{
- le32_to_cpus(&req->MsgContext);
+ req->MsgContext = le32_to_cpu(req->MsgContext);
}
void mptsas_fix_ioc_facts_reply_endianness(MPIMsgIOCFactsReply *reply)
{
- cpu_to_le16s(&reply->MsgVersion);
- cpu_to_le16s(&reply->HeaderVersion);
- cpu_to_le32s(&reply->MsgContext);
- cpu_to_le16s(&reply->IOCExceptions);
- cpu_to_le16s(&reply->IOCStatus);
- cpu_to_le32s(&reply->IOCLogInfo);
- cpu_to_le16s(&reply->ReplyQueueDepth);
- cpu_to_le16s(&reply->RequestFrameSize);
- cpu_to_le16s(&reply->ProductID);
- cpu_to_le32s(&reply->CurrentHostMfaHighAddr);
- cpu_to_le16s(&reply->GlobalCredits);
- cpu_to_le32s(&reply->CurrentSenseBufferHighAddr);
- cpu_to_le16s(&reply->CurReplyFrameSize);
- cpu_to_le32s(&reply->FWImageSize);
- cpu_to_le32s(&reply->IOCCapabilities);
- cpu_to_le16s(&reply->HighPriorityQueueDepth);
+ reply->MsgVersion = cpu_to_le16(reply->MsgVersion);
+ reply->HeaderVersion = cpu_to_le16(reply->HeaderVersion);
+ reply->MsgContext = cpu_to_le32(reply->MsgContext);
+ reply->IOCExceptions = cpu_to_le16(reply->IOCExceptions);
+ reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
+ reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
+ reply->ReplyQueueDepth = cpu_to_le16(reply->ReplyQueueDepth);
+ reply->RequestFrameSize = cpu_to_le16(reply->RequestFrameSize);
+ reply->ProductID = cpu_to_le16(reply->ProductID);
+ reply->CurrentHostMfaHighAddr = cpu_to_le32(reply->CurrentHostMfaHighAddr);
+ reply->GlobalCredits = cpu_to_le16(reply->GlobalCredits);
+ reply->CurrentSenseBufferHighAddr =
+ cpu_to_le32(reply->CurrentSenseBufferHighAddr);
+ reply->CurReplyFrameSize = cpu_to_le16(reply->CurReplyFrameSize);
+ reply->FWImageSize = cpu_to_le32(reply->FWImageSize);
+ reply->IOCCapabilities = cpu_to_le32(reply->IOCCapabilities);
+ reply->HighPriorityQueueDepth = cpu_to_le16(reply->HighPriorityQueueDepth);
mptsas_fix_sgentry_endianness_reply(&reply->HostPageBufferSGE);
- cpu_to_le32s(&reply->ReplyFifoHostSignalingAddr);
+ reply->ReplyFifoHostSignalingAddr =
+ cpu_to_le32(reply->ReplyFifoHostSignalingAddr);
}
void mptsas_fix_config_endianness(MPIMsgConfig *req)
{
- le16_to_cpus(&req->ExtPageLength);
- le32_to_cpus(&req->MsgContext);
- le32_to_cpus(&req->PageAddress);
+ req->ExtPageLength = le16_to_cpu(req->ExtPageLength);
+ req->MsgContext = le32_to_cpu(req->MsgContext);
+ req->PageAddress = le32_to_cpu(req->PageAddress);
mptsas_fix_sgentry_endianness(&req->PageBufferSGE);
}
void mptsas_fix_config_reply_endianness(MPIMsgConfigReply *reply)
{
- cpu_to_le16s(&reply->ExtPageLength);
- cpu_to_le32s(&reply->MsgContext);
- cpu_to_le16s(&reply->IOCStatus);
- cpu_to_le32s(&reply->IOCLogInfo);
+ reply->ExtPageLength = cpu_to_le16(reply->ExtPageLength);
+ reply->MsgContext = cpu_to_le32(reply->MsgContext);
+ reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
+ reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
}
void mptsas_fix_port_facts_endianness(MPIMsgPortFacts *req)
{
- le32_to_cpus(&req->MsgContext);
+ req->MsgContext = le32_to_cpu(req->MsgContext);
}
void mptsas_fix_port_facts_reply_endianness(MPIMsgPortFactsReply *reply)
{
- cpu_to_le32s(&reply->MsgContext);
- cpu_to_le16s(&reply->IOCStatus);
- cpu_to_le32s(&reply->IOCLogInfo);
- cpu_to_le16s(&reply->MaxDevices);
- cpu_to_le16s(&reply->PortSCSIID);
- cpu_to_le16s(&reply->ProtocolFlags);
- cpu_to_le16s(&reply->MaxPostedCmdBuffers);
- cpu_to_le16s(&reply->MaxPersistentIDs);
- cpu_to_le16s(&reply->MaxLanBuckets);
+ reply->MsgContext = cpu_to_le32(reply->MsgContext);
+ reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
+ reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
+ reply->MaxDevices = cpu_to_le16(reply->MaxDevices);
+ reply->PortSCSIID = cpu_to_le16(reply->PortSCSIID);
+ reply->ProtocolFlags = cpu_to_le16(reply->ProtocolFlags);
+ reply->MaxPostedCmdBuffers = cpu_to_le16(reply->MaxPostedCmdBuffers);
+ reply->MaxPersistentIDs = cpu_to_le16(reply->MaxPersistentIDs);
+ reply->MaxLanBuckets = cpu_to_le16(reply->MaxLanBuckets);
}
void mptsas_fix_port_enable_endianness(MPIMsgPortEnable *req)
{
- le32_to_cpus(&req->MsgContext);
+ req->MsgContext = le32_to_cpu(req->MsgContext);
}
void mptsas_fix_port_enable_reply_endianness(MPIMsgPortEnableReply *reply)
{
- cpu_to_le32s(&reply->MsgContext);
- cpu_to_le16s(&reply->IOCStatus);
- cpu_to_le32s(&reply->IOCLogInfo);
+ reply->MsgContext = cpu_to_le32(reply->MsgContext);
+ reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
+ reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
}
void mptsas_fix_event_notification_endianness(MPIMsgEventNotify *req)
{
- le32_to_cpus(&req->MsgContext);
+ req->MsgContext = le32_to_cpu(req->MsgContext);
}
void mptsas_fix_event_notification_reply_endianness(MPIMsgEventNotifyReply *reply)
@@ -188,16 +191,16 @@ void mptsas_fix_event_notification_reply_endianness(MPIMsgEventNotifyReply *repl
int length = reply->EventDataLength;
int i;
- cpu_to_le16s(&reply->EventDataLength);
- cpu_to_le32s(&reply->MsgContext);
- cpu_to_le16s(&reply->IOCStatus);
- cpu_to_le32s(&reply->IOCLogInfo);
- cpu_to_le32s(&reply->Event);
- cpu_to_le32s(&reply->EventContext);
+ reply->EventDataLength = cpu_to_le16(reply->EventDataLength);
+ reply->MsgContext = cpu_to_le32(reply->MsgContext);
+ reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
+ reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
+ reply->Event = cpu_to_le32(reply->Event);
+ reply->EventContext = cpu_to_le32(reply->EventContext);
/* Really depends on the event kind. This will do for now. */
for (i = 0; i < length; i++) {
- cpu_to_le32s(&reply->Data[i]);
+ reply->Data[i] = cpu_to_le32(reply->Data[i]);
}
}
--
2.19.0
On Thu, 09/27 14:48, Peter Maydell wrote: > NB: tested with qemu-system-x86_64 -cpu host -enable-kvm -m 4096 > -device mptsas1068 -drive id=mydisk,if=none,file=harddisk.qcow2 > -device scsi-disk,drive=mydisk > which behaves no differently before or after the patch, though > the guest I have (an x86 ubuntu) seems to detect the controller > but not find any disks attached to it. Maybe my command line is wrong? But do you see a /dev/sda in guest (or does it boot at all)? Anyway the patch looks correct, so Reviewed-by: Fam Zheng <famz@redhat.com>
On 28 September 2018 at 09:15, Fam Zheng <famz@redhat.com> wrote: > On Thu, 09/27 14:48, Peter Maydell wrote: >> NB: tested with qemu-system-x86_64 -cpu host -enable-kvm -m 4096 >> -device mptsas1068 -drive id=mydisk,if=none,file=harddisk.qcow2 >> -device scsi-disk,drive=mydisk >> which behaves no differently before or after the patch, though >> the guest I have (an x86 ubuntu) seems to detect the controller >> but not find any disks attached to it. Maybe my command line is wrong? > > But do you see a /dev/sda in guest (or does it boot at all)? No, it doesn't boot -- it can't find a disk so it dumps me to an initrd prompt, where there's nothing in /dev/disk/by-id/ except the cdrom drive. thanks -- PMM
On Fri, 09/28 11:25, Peter Maydell wrote: > On 28 September 2018 at 09:15, Fam Zheng <famz@redhat.com> wrote: > > On Thu, 09/27 14:48, Peter Maydell wrote: > >> NB: tested with qemu-system-x86_64 -cpu host -enable-kvm -m 4096 > >> -device mptsas1068 -drive id=mydisk,if=none,file=harddisk.qcow2 > >> -device scsi-disk,drive=mydisk > >> which behaves no differently before or after the patch, though > >> the guest I have (an x86 ubuntu) seems to detect the controller > >> but not find any disks attached to it. Maybe my command line is wrong? > > > > But do you see a /dev/sda in guest (or does it boot at all)? > > No, it doesn't boot -- it can't find a disk so it dumps > me to an initrd prompt, where there's nothing in > /dev/disk/by-id/ except the cdrom drive. Maybe it's because the initrd has mptsas.ko but not sd_mod.ko? Fam
On 27/09/2018 15:48, Peter Maydell wrote:
> Taking the address of a field in a packed struct is a bad idea, because
> it might not be actually aligned enough for that pointer type (and
> thus cause a crash on dereference on some host architectures). Newer
> versions of clang warn about this. Avoid the bug by not using the
> "modify in place" byte swapping functions.
>
> This patch was produced with the following simple spatch script:
> @@
> expression E;
> @@
> -le16_to_cpus(&E);
> +E = le16_to_cpu(E);
> @@
> expression E;
> @@
> -le32_to_cpus(&E);
> +E = le32_to_cpu(E);
> @@
> expression E;
> @@
> -le64_to_cpus(&E);
> +E = le64_to_cpu(E);
> @@
> expression E;
> @@
> -cpu_to_le16s(&E);
> +E = cpu_to_le16(E);
> @@
> expression E;
> @@
> -cpu_to_le32s(&E);
> +E = cpu_to_le32(E);
> @@
> expression E;
> @@
> -cpu_to_le64s(&E);
> +E = cpu_to_le64(E);
>
> followed by some minor tidying of overlong lines and bad indent.
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
> NB: tested with qemu-system-x86_64 -cpu host -enable-kvm -m 4096
> -device mptsas1068 -drive id=mydisk,if=none,file=harddisk.qcow2
> -device scsi-disk,drive=mydisk
> which behaves no differently before or after the patch, though
> the guest I have (an x86 ubuntu) seems to detect the controller
> but not find any disks attached to it. Maybe my command line is wrong?
I think you need to specify the WWN, port WWN and port index of the disk.
Paolo
> hw/scsi/mptendian.c | 163 ++++++++++++++++++++++----------------------
> 1 file changed, 83 insertions(+), 80 deletions(-)
>
> diff --git a/hw/scsi/mptendian.c b/hw/scsi/mptendian.c
> index 8ae39a76f42..79f99734d21 100644
> --- a/hw/scsi/mptendian.c
> +++ b/hw/scsi/mptendian.c
> @@ -35,152 +35,155 @@
>
> static void mptsas_fix_sgentry_endianness(MPISGEntry *sge)
> {
> - le32_to_cpus(&sge->FlagsLength);
> + sge->FlagsLength = le32_to_cpu(sge->FlagsLength);
> if (sge->FlagsLength & MPI_SGE_FLAGS_64_BIT_ADDRESSING) {
> - le64_to_cpus(&sge->u.Address64);
> + sge->u.Address64 = le64_to_cpu(sge->u.Address64);
> } else {
> - le32_to_cpus(&sge->u.Address32);
> + sge->u.Address32 = le32_to_cpu(sge->u.Address32);
> }
> }
>
> static void mptsas_fix_sgentry_endianness_reply(MPISGEntry *sge)
> {
> if (sge->FlagsLength & MPI_SGE_FLAGS_64_BIT_ADDRESSING) {
> - cpu_to_le64s(&sge->u.Address64);
> + sge->u.Address64 = cpu_to_le64(sge->u.Address64);
> } else {
> - cpu_to_le32s(&sge->u.Address32);
> + sge->u.Address32 = cpu_to_le32(sge->u.Address32);
> }
> - cpu_to_le32s(&sge->FlagsLength);
> + sge->FlagsLength = cpu_to_le32(sge->FlagsLength);
> }
>
> void mptsas_fix_scsi_io_endianness(MPIMsgSCSIIORequest *req)
> {
> - le32_to_cpus(&req->MsgContext);
> - le32_to_cpus(&req->Control);
> - le32_to_cpus(&req->DataLength);
> - le32_to_cpus(&req->SenseBufferLowAddr);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> + req->Control = le32_to_cpu(req->Control);
> + req->DataLength = le32_to_cpu(req->DataLength);
> + req->SenseBufferLowAddr = le32_to_cpu(req->SenseBufferLowAddr);
> }
>
> void mptsas_fix_scsi_io_reply_endianness(MPIMsgSCSIIOReply *reply)
> {
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> - cpu_to_le32s(&reply->TransferCount);
> - cpu_to_le32s(&reply->SenseCount);
> - cpu_to_le32s(&reply->ResponseInfo);
> - cpu_to_le16s(&reply->TaskTag);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> + reply->TransferCount = cpu_to_le32(reply->TransferCount);
> + reply->SenseCount = cpu_to_le32(reply->SenseCount);
> + reply->ResponseInfo = cpu_to_le32(reply->ResponseInfo);
> + reply->TaskTag = cpu_to_le16(reply->TaskTag);
> }
>
> void mptsas_fix_scsi_task_mgmt_endianness(MPIMsgSCSITaskMgmt *req)
> {
> - le32_to_cpus(&req->MsgContext);
> - le32_to_cpus(&req->TaskMsgContext);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> + req->TaskMsgContext = le32_to_cpu(req->TaskMsgContext);
> }
>
> void mptsas_fix_scsi_task_mgmt_reply_endianness(MPIMsgSCSITaskMgmtReply *reply)
> {
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> - cpu_to_le32s(&reply->TerminationCount);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> + reply->TerminationCount = cpu_to_le32(reply->TerminationCount);
> }
>
> void mptsas_fix_ioc_init_endianness(MPIMsgIOCInit *req)
> {
> - le32_to_cpus(&req->MsgContext);
> - le16_to_cpus(&req->ReplyFrameSize);
> - le32_to_cpus(&req->HostMfaHighAddr);
> - le32_to_cpus(&req->SenseBufferHighAddr);
> - le32_to_cpus(&req->ReplyFifoHostSignalingAddr);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> + req->ReplyFrameSize = le16_to_cpu(req->ReplyFrameSize);
> + req->HostMfaHighAddr = le32_to_cpu(req->HostMfaHighAddr);
> + req->SenseBufferHighAddr = le32_to_cpu(req->SenseBufferHighAddr);
> + req->ReplyFifoHostSignalingAddr =
> + le32_to_cpu(req->ReplyFifoHostSignalingAddr);
> mptsas_fix_sgentry_endianness(&req->HostPageBufferSGE);
> - le16_to_cpus(&req->MsgVersion);
> - le16_to_cpus(&req->HeaderVersion);
> + req->MsgVersion = le16_to_cpu(req->MsgVersion);
> + req->HeaderVersion = le16_to_cpu(req->HeaderVersion);
> }
>
> void mptsas_fix_ioc_init_reply_endianness(MPIMsgIOCInitReply *reply)
> {
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> }
>
> void mptsas_fix_ioc_facts_endianness(MPIMsgIOCFacts *req)
> {
> - le32_to_cpus(&req->MsgContext);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> }
>
> void mptsas_fix_ioc_facts_reply_endianness(MPIMsgIOCFactsReply *reply)
> {
> - cpu_to_le16s(&reply->MsgVersion);
> - cpu_to_le16s(&reply->HeaderVersion);
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCExceptions);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> - cpu_to_le16s(&reply->ReplyQueueDepth);
> - cpu_to_le16s(&reply->RequestFrameSize);
> - cpu_to_le16s(&reply->ProductID);
> - cpu_to_le32s(&reply->CurrentHostMfaHighAddr);
> - cpu_to_le16s(&reply->GlobalCredits);
> - cpu_to_le32s(&reply->CurrentSenseBufferHighAddr);
> - cpu_to_le16s(&reply->CurReplyFrameSize);
> - cpu_to_le32s(&reply->FWImageSize);
> - cpu_to_le32s(&reply->IOCCapabilities);
> - cpu_to_le16s(&reply->HighPriorityQueueDepth);
> + reply->MsgVersion = cpu_to_le16(reply->MsgVersion);
> + reply->HeaderVersion = cpu_to_le16(reply->HeaderVersion);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCExceptions = cpu_to_le16(reply->IOCExceptions);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> + reply->ReplyQueueDepth = cpu_to_le16(reply->ReplyQueueDepth);
> + reply->RequestFrameSize = cpu_to_le16(reply->RequestFrameSize);
> + reply->ProductID = cpu_to_le16(reply->ProductID);
> + reply->CurrentHostMfaHighAddr = cpu_to_le32(reply->CurrentHostMfaHighAddr);
> + reply->GlobalCredits = cpu_to_le16(reply->GlobalCredits);
> + reply->CurrentSenseBufferHighAddr =
> + cpu_to_le32(reply->CurrentSenseBufferHighAddr);
> + reply->CurReplyFrameSize = cpu_to_le16(reply->CurReplyFrameSize);
> + reply->FWImageSize = cpu_to_le32(reply->FWImageSize);
> + reply->IOCCapabilities = cpu_to_le32(reply->IOCCapabilities);
> + reply->HighPriorityQueueDepth = cpu_to_le16(reply->HighPriorityQueueDepth);
> mptsas_fix_sgentry_endianness_reply(&reply->HostPageBufferSGE);
> - cpu_to_le32s(&reply->ReplyFifoHostSignalingAddr);
> + reply->ReplyFifoHostSignalingAddr =
> + cpu_to_le32(reply->ReplyFifoHostSignalingAddr);
> }
>
> void mptsas_fix_config_endianness(MPIMsgConfig *req)
> {
> - le16_to_cpus(&req->ExtPageLength);
> - le32_to_cpus(&req->MsgContext);
> - le32_to_cpus(&req->PageAddress);
> + req->ExtPageLength = le16_to_cpu(req->ExtPageLength);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> + req->PageAddress = le32_to_cpu(req->PageAddress);
> mptsas_fix_sgentry_endianness(&req->PageBufferSGE);
> }
>
> void mptsas_fix_config_reply_endianness(MPIMsgConfigReply *reply)
> {
> - cpu_to_le16s(&reply->ExtPageLength);
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> + reply->ExtPageLength = cpu_to_le16(reply->ExtPageLength);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> }
>
> void mptsas_fix_port_facts_endianness(MPIMsgPortFacts *req)
> {
> - le32_to_cpus(&req->MsgContext);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> }
>
> void mptsas_fix_port_facts_reply_endianness(MPIMsgPortFactsReply *reply)
> {
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> - cpu_to_le16s(&reply->MaxDevices);
> - cpu_to_le16s(&reply->PortSCSIID);
> - cpu_to_le16s(&reply->ProtocolFlags);
> - cpu_to_le16s(&reply->MaxPostedCmdBuffers);
> - cpu_to_le16s(&reply->MaxPersistentIDs);
> - cpu_to_le16s(&reply->MaxLanBuckets);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> + reply->MaxDevices = cpu_to_le16(reply->MaxDevices);
> + reply->PortSCSIID = cpu_to_le16(reply->PortSCSIID);
> + reply->ProtocolFlags = cpu_to_le16(reply->ProtocolFlags);
> + reply->MaxPostedCmdBuffers = cpu_to_le16(reply->MaxPostedCmdBuffers);
> + reply->MaxPersistentIDs = cpu_to_le16(reply->MaxPersistentIDs);
> + reply->MaxLanBuckets = cpu_to_le16(reply->MaxLanBuckets);
> }
>
> void mptsas_fix_port_enable_endianness(MPIMsgPortEnable *req)
> {
> - le32_to_cpus(&req->MsgContext);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> }
>
> void mptsas_fix_port_enable_reply_endianness(MPIMsgPortEnableReply *reply)
> {
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> }
>
> void mptsas_fix_event_notification_endianness(MPIMsgEventNotify *req)
> {
> - le32_to_cpus(&req->MsgContext);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> }
>
> void mptsas_fix_event_notification_reply_endianness(MPIMsgEventNotifyReply *reply)
> @@ -188,16 +191,16 @@ void mptsas_fix_event_notification_reply_endianness(MPIMsgEventNotifyReply *repl
> int length = reply->EventDataLength;
> int i;
>
> - cpu_to_le16s(&reply->EventDataLength);
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> - cpu_to_le32s(&reply->Event);
> - cpu_to_le32s(&reply->EventContext);
> + reply->EventDataLength = cpu_to_le16(reply->EventDataLength);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> + reply->Event = cpu_to_le32(reply->Event);
> + reply->EventContext = cpu_to_le32(reply->EventContext);
>
> /* Really depends on the event kind. This will do for now. */
> for (i = 0; i < length; i++) {
> - cpu_to_le32s(&reply->Data[i]);
> + reply->Data[i] = cpu_to_le32(reply->Data[i]);
> }
> }
>
>
Hi Peter,
On 27/09/2018 15:48, Peter Maydell wrote:
> Taking the address of a field in a packed struct is a bad idea, because
> it might not be actually aligned enough for that pointer type (and
> thus cause a crash on dereference on some host architectures). Newer
> versions of clang warn about this. Avoid the bug by not using the
> "modify in place" byte swapping functions.
The goal of this cleanup is to eventually get rid of the X_to_cpus() and
cpu_to_Xs()? Or uniquely when the field belong to a packed struct?
> This patch was produced with the following simple spatch script:
> @@
> expression E;
> @@
> -le16_to_cpus(&E);
> +E = le16_to_cpu(E);
> @@
> expression E;
> @@
> -le32_to_cpus(&E);
> +E = le32_to_cpu(E);
> @@
> expression E;
> @@
> -le64_to_cpus(&E);
> +E = le64_to_cpu(E);
> @@
> expression E;
> @@
> -cpu_to_le16s(&E);
> +E = cpu_to_le16(E);
> @@
> expression E;
> @@
> -cpu_to_le32s(&E);
> +E = cpu_to_le32(E);
> @@
> expression E;
> @@
> -cpu_to_le64s(&E);
> +E = cpu_to_le64(E);
>
> followed by some minor tidying of overlong lines and bad indent.
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
> NB: tested with qemu-system-x86_64 -cpu host -enable-kvm -m 4096
> -device mptsas1068 -drive id=mydisk,if=none,file=harddisk.qcow2
> -device scsi-disk,drive=mydisk
> which behaves no differently before or after the patch, though
> the guest I have (an x86 ubuntu) seems to detect the controller
> but not find any disks attached to it. Maybe my command line is wrong?
>
> hw/scsi/mptendian.c | 163 ++++++++++++++++++++++----------------------
> 1 file changed, 83 insertions(+), 80 deletions(-)
>
> diff --git a/hw/scsi/mptendian.c b/hw/scsi/mptendian.c
> index 8ae39a76f42..79f99734d21 100644
> --- a/hw/scsi/mptendian.c
> +++ b/hw/scsi/mptendian.c
> @@ -35,152 +35,155 @@
>
> static void mptsas_fix_sgentry_endianness(MPISGEntry *sge)
> {
> - le32_to_cpus(&sge->FlagsLength);
> + sge->FlagsLength = le32_to_cpu(sge->FlagsLength);
> if (sge->FlagsLength & MPI_SGE_FLAGS_64_BIT_ADDRESSING) {
> - le64_to_cpus(&sge->u.Address64);
> + sge->u.Address64 = le64_to_cpu(sge->u.Address64);
> } else {
> - le32_to_cpus(&sge->u.Address32);
> + sge->u.Address32 = le32_to_cpu(sge->u.Address32);
> }
> }
>
> static void mptsas_fix_sgentry_endianness_reply(MPISGEntry *sge)
> {
> if (sge->FlagsLength & MPI_SGE_FLAGS_64_BIT_ADDRESSING) {
> - cpu_to_le64s(&sge->u.Address64);
> + sge->u.Address64 = cpu_to_le64(sge->u.Address64);
> } else {
> - cpu_to_le32s(&sge->u.Address32);
> + sge->u.Address32 = cpu_to_le32(sge->u.Address32);
> }
> - cpu_to_le32s(&sge->FlagsLength);
> + sge->FlagsLength = cpu_to_le32(sge->FlagsLength);
> }
>
> void mptsas_fix_scsi_io_endianness(MPIMsgSCSIIORequest *req)
> {
> - le32_to_cpus(&req->MsgContext);
> - le32_to_cpus(&req->Control);
> - le32_to_cpus(&req->DataLength);
> - le32_to_cpus(&req->SenseBufferLowAddr);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> + req->Control = le32_to_cpu(req->Control);
> + req->DataLength = le32_to_cpu(req->DataLength);
> + req->SenseBufferLowAddr = le32_to_cpu(req->SenseBufferLowAddr);
> }
>
> void mptsas_fix_scsi_io_reply_endianness(MPIMsgSCSIIOReply *reply)
> {
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> - cpu_to_le32s(&reply->TransferCount);
> - cpu_to_le32s(&reply->SenseCount);
> - cpu_to_le32s(&reply->ResponseInfo);
> - cpu_to_le16s(&reply->TaskTag);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> + reply->TransferCount = cpu_to_le32(reply->TransferCount);
> + reply->SenseCount = cpu_to_le32(reply->SenseCount);
> + reply->ResponseInfo = cpu_to_le32(reply->ResponseInfo);
> + reply->TaskTag = cpu_to_le16(reply->TaskTag);
> }
>
> void mptsas_fix_scsi_task_mgmt_endianness(MPIMsgSCSITaskMgmt *req)
> {
> - le32_to_cpus(&req->MsgContext);
> - le32_to_cpus(&req->TaskMsgContext);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> + req->TaskMsgContext = le32_to_cpu(req->TaskMsgContext);
> }
>
> void mptsas_fix_scsi_task_mgmt_reply_endianness(MPIMsgSCSITaskMgmtReply *reply)
> {
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> - cpu_to_le32s(&reply->TerminationCount);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> + reply->TerminationCount = cpu_to_le32(reply->TerminationCount);
> }
>
> void mptsas_fix_ioc_init_endianness(MPIMsgIOCInit *req)
> {
> - le32_to_cpus(&req->MsgContext);
> - le16_to_cpus(&req->ReplyFrameSize);
> - le32_to_cpus(&req->HostMfaHighAddr);
> - le32_to_cpus(&req->SenseBufferHighAddr);
> - le32_to_cpus(&req->ReplyFifoHostSignalingAddr);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> + req->ReplyFrameSize = le16_to_cpu(req->ReplyFrameSize);
> + req->HostMfaHighAddr = le32_to_cpu(req->HostMfaHighAddr);
> + req->SenseBufferHighAddr = le32_to_cpu(req->SenseBufferHighAddr);
> + req->ReplyFifoHostSignalingAddr =
> + le32_to_cpu(req->ReplyFifoHostSignalingAddr);
> mptsas_fix_sgentry_endianness(&req->HostPageBufferSGE);
> - le16_to_cpus(&req->MsgVersion);
> - le16_to_cpus(&req->HeaderVersion);
> + req->MsgVersion = le16_to_cpu(req->MsgVersion);
> + req->HeaderVersion = le16_to_cpu(req->HeaderVersion);
> }
>
> void mptsas_fix_ioc_init_reply_endianness(MPIMsgIOCInitReply *reply)
> {
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> }
>
> void mptsas_fix_ioc_facts_endianness(MPIMsgIOCFacts *req)
> {
> - le32_to_cpus(&req->MsgContext);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> }
>
> void mptsas_fix_ioc_facts_reply_endianness(MPIMsgIOCFactsReply *reply)
> {
> - cpu_to_le16s(&reply->MsgVersion);
> - cpu_to_le16s(&reply->HeaderVersion);
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCExceptions);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> - cpu_to_le16s(&reply->ReplyQueueDepth);
> - cpu_to_le16s(&reply->RequestFrameSize);
> - cpu_to_le16s(&reply->ProductID);
> - cpu_to_le32s(&reply->CurrentHostMfaHighAddr);
> - cpu_to_le16s(&reply->GlobalCredits);
> - cpu_to_le32s(&reply->CurrentSenseBufferHighAddr);
> - cpu_to_le16s(&reply->CurReplyFrameSize);
> - cpu_to_le32s(&reply->FWImageSize);
> - cpu_to_le32s(&reply->IOCCapabilities);
> - cpu_to_le16s(&reply->HighPriorityQueueDepth);
> + reply->MsgVersion = cpu_to_le16(reply->MsgVersion);
> + reply->HeaderVersion = cpu_to_le16(reply->HeaderVersion);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCExceptions = cpu_to_le16(reply->IOCExceptions);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> + reply->ReplyQueueDepth = cpu_to_le16(reply->ReplyQueueDepth);
> + reply->RequestFrameSize = cpu_to_le16(reply->RequestFrameSize);
> + reply->ProductID = cpu_to_le16(reply->ProductID);
> + reply->CurrentHostMfaHighAddr = cpu_to_le32(reply->CurrentHostMfaHighAddr);
> + reply->GlobalCredits = cpu_to_le16(reply->GlobalCredits);
> + reply->CurrentSenseBufferHighAddr =
> + cpu_to_le32(reply->CurrentSenseBufferHighAddr);
> + reply->CurReplyFrameSize = cpu_to_le16(reply->CurReplyFrameSize);
> + reply->FWImageSize = cpu_to_le32(reply->FWImageSize);
> + reply->IOCCapabilities = cpu_to_le32(reply->IOCCapabilities);
> + reply->HighPriorityQueueDepth = cpu_to_le16(reply->HighPriorityQueueDepth);
> mptsas_fix_sgentry_endianness_reply(&reply->HostPageBufferSGE);
> - cpu_to_le32s(&reply->ReplyFifoHostSignalingAddr);
> + reply->ReplyFifoHostSignalingAddr =
> + cpu_to_le32(reply->ReplyFifoHostSignalingAddr);
> }
>
> void mptsas_fix_config_endianness(MPIMsgConfig *req)
> {
> - le16_to_cpus(&req->ExtPageLength);
> - le32_to_cpus(&req->MsgContext);
> - le32_to_cpus(&req->PageAddress);
> + req->ExtPageLength = le16_to_cpu(req->ExtPageLength);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> + req->PageAddress = le32_to_cpu(req->PageAddress);
> mptsas_fix_sgentry_endianness(&req->PageBufferSGE);
> }
>
> void mptsas_fix_config_reply_endianness(MPIMsgConfigReply *reply)
> {
> - cpu_to_le16s(&reply->ExtPageLength);
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> + reply->ExtPageLength = cpu_to_le16(reply->ExtPageLength);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> }
>
> void mptsas_fix_port_facts_endianness(MPIMsgPortFacts *req)
> {
> - le32_to_cpus(&req->MsgContext);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> }
>
> void mptsas_fix_port_facts_reply_endianness(MPIMsgPortFactsReply *reply)
> {
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> - cpu_to_le16s(&reply->MaxDevices);
> - cpu_to_le16s(&reply->PortSCSIID);
> - cpu_to_le16s(&reply->ProtocolFlags);
> - cpu_to_le16s(&reply->MaxPostedCmdBuffers);
> - cpu_to_le16s(&reply->MaxPersistentIDs);
> - cpu_to_le16s(&reply->MaxLanBuckets);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> + reply->MaxDevices = cpu_to_le16(reply->MaxDevices);
> + reply->PortSCSIID = cpu_to_le16(reply->PortSCSIID);
> + reply->ProtocolFlags = cpu_to_le16(reply->ProtocolFlags);
> + reply->MaxPostedCmdBuffers = cpu_to_le16(reply->MaxPostedCmdBuffers);
> + reply->MaxPersistentIDs = cpu_to_le16(reply->MaxPersistentIDs);
> + reply->MaxLanBuckets = cpu_to_le16(reply->MaxLanBuckets);
> }
>
> void mptsas_fix_port_enable_endianness(MPIMsgPortEnable *req)
> {
> - le32_to_cpus(&req->MsgContext);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> }
>
> void mptsas_fix_port_enable_reply_endianness(MPIMsgPortEnableReply *reply)
> {
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> }
>
> void mptsas_fix_event_notification_endianness(MPIMsgEventNotify *req)
> {
> - le32_to_cpus(&req->MsgContext);
> + req->MsgContext = le32_to_cpu(req->MsgContext);
> }
>
> void mptsas_fix_event_notification_reply_endianness(MPIMsgEventNotifyReply *reply)
> @@ -188,16 +191,16 @@ void mptsas_fix_event_notification_reply_endianness(MPIMsgEventNotifyReply *repl
> int length = reply->EventDataLength;
> int i;
>
> - cpu_to_le16s(&reply->EventDataLength);
> - cpu_to_le32s(&reply->MsgContext);
> - cpu_to_le16s(&reply->IOCStatus);
> - cpu_to_le32s(&reply->IOCLogInfo);
> - cpu_to_le32s(&reply->Event);
> - cpu_to_le32s(&reply->EventContext);
> + reply->EventDataLength = cpu_to_le16(reply->EventDataLength);
> + reply->MsgContext = cpu_to_le32(reply->MsgContext);
> + reply->IOCStatus = cpu_to_le16(reply->IOCStatus);
> + reply->IOCLogInfo = cpu_to_le32(reply->IOCLogInfo);
> + reply->Event = cpu_to_le32(reply->Event);
> + reply->EventContext = cpu_to_le32(reply->EventContext);
>
> /* Really depends on the event kind. This will do for now. */
> for (i = 0; i < length; i++) {
> - cpu_to_le32s(&reply->Data[i]);
> + reply->Data[i] = cpu_to_le32(reply->Data[i]);
> }
> }
>
>
On 28 September 2018 at 13:04, Philippe Mathieu-Daudé <philmd@redhat.com> wrote: > Hi Peter, > > On 27/09/2018 15:48, Peter Maydell wrote: >> Taking the address of a field in a packed struct is a bad idea, because >> it might not be actually aligned enough for that pointer type (and >> thus cause a crash on dereference on some host architectures). Newer >> versions of clang warn about this. Avoid the bug by not using the >> "modify in place" byte swapping functions. > > The goal of this cleanup is to eventually get rid of the X_to_cpus() and > cpu_to_Xs()? Or uniquely when the field belong to a packed struct? The goal of the cleanup is to fix the warnings. I suspect when we've finished doing that we'll find there are very few uses of the in-place conversion functions remaining, so maybe we'll want to get rid of the rest just to reduce the number of byte-swapping APIs we'll have -- but that's something we can think about when we get there. thanks -- PMM
© 2016 - 2024 Red Hat, Inc.