[v1] Misc patches for 2020-09-24

[PULL 26/92] hw: megasas: return -1 when 'megasas_map_sgl' fails

Paolo Bonzini posted 92 patches 5 years, 4 months ago

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Maintainers: Fam Zheng <fam@euphon.net>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Stefan Hajnoczi <stefanha@redhat.com>, "Alex Bennée" <alex.bennee@linaro.org>, Thomas Huth <thuth@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>, Christian Borntraeger <borntraeger@de.ibm.com>, Markus Armbruster <armbru@redhat.com>, Bandan Das <bsd@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>, Michael Roth <mdroth@linux.vnet.ibm.com>, Peter Maydell <peter.maydell@linaro.org>, Jason Wang <jasowang@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Sergio Lopez <slp@redhat.com>, Igor Mammedov <imammedo@redhat.com>, Laurent Vivier <lvivier@redhat.com>, Hannes Reinecke <hare@suse.com>, Stefan Weil <sw@weilnetz.de>, Cleber Rosa <crosa@redhat.com>, Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>, David Hildenbrand <david@redhat.com>, Aurelien Jarno <aurelien@aurel32.net>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Eric Blake <eblake@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>, Alexander Bulekov <alxndr@bu.edu>, "Michael S. Tsirkin" <mst@redhat.com>, David Gibson <david@gibson.dropbear.id.au>, Max Reitz <mreitz@redhat.com>, Eduardo Habkost <ehabkost@redhat.com>, Sunil Muthuswamy <sunilmut@microsoft.com>, Richard Henderson <rth@twiddle.net>, Jiaxun Yang <jiaxun.yang@flygoat.com>, Kevin Wolf <kwolf@redhat.com>, Cornelia Huck <cohuck@redhat.com>, Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>, Halil Pasic <pasic@linux.ibm.com>

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[PULL 26/92] hw: megasas: return -1 when 'megasas_map_sgl' fails

Posted by Paolo Bonzini 5 years, 4 months ago

From: Li Qiang <liq3ea@163.com>

The caller of 'megasas_map_sgl' will only check if the return
is zero or not. If it return 0 it means success, as in the next
patch we will consider 'iov_count=0' is an error, so let's
return -1 to indicate a failure.

Signed-off-by: Li Qiang <liq3ea@163.com>
Message-Id: <20200815141940.44025-2-liq3ea@163.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/scsi/megasas.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index e90c00823a..4cc709d2c6 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -280,7 +280,7 @@ static int megasas_map_sgl(MegasasState *s, MegasasCmd *cmd, union mfi_sgl *sgl)
     if (iov_count > MEGASAS_MAX_SGE) {
         trace_megasas_iovec_sgl_overflow(cmd->index, iov_count,
                                          MEGASAS_MAX_SGE);
-        return iov_count;
+        return -1;
     }
     pci_dma_sglist_init(&cmd->qsg, PCI_DEVICE(s), iov_count);
     for (i = 0; i < iov_count; i++) {
@@ -310,7 +310,7 @@ static int megasas_map_sgl(MegasasState *s, MegasasCmd *cmd, union mfi_sgl *sgl)
     return 0;
 unmap:
     qemu_sglist_destroy(&cmd->qsg);
-    return iov_count - i;
+    return -1;
 }
 
 /*
-- 
2.26.2