From: Kevin Wolf <kwolf@redhat.com>

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
---
 tests/ide-test.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/tests/ide-test.c b/tests/ide-test.c
index bfd79dd..ffbfb04 100644
--- a/tests/ide-test.c
+++ b/tests/ide-test.c
@@ -689,6 +689,24 @@ static void test_flush_nodev(void)
     ide_test_quit();
 }
 
+static void test_flush_empty_drive(void)
+{
+    QPCIDevice *dev;
+    QPCIBar bmdma_bar, ide_bar;
+
+    ide_test_start("-device ide-cd,bus=ide.0");
+    dev = get_pci_device(&bmdma_bar, &ide_bar);
+
+    /* FLUSH CACHE command on device 0*/
+    qpci_io_writeb(dev, ide_bar, reg_device, 0);
+    qpci_io_writeb(dev, ide_bar, reg_command, CMD_FLUSH_CACHE);
+
+    /* Just testing that qemu doesn't crash... */
+
+    free_pci_device(dev);
+    ide_test_quit();
+}
+
 static void test_pci_retry_flush(void)
 {
     test_retry_flush("pc");
@@ -954,6 +972,7 @@ int main(int argc, char **argv)
 
     qtest_add_func("/ide/flush", test_flush);
     qtest_add_func("/ide/flush/nodev", test_flush_nodev);
+    qtest_add_func("/ide/flush/empty_drive", test_flush_empty_drive);
     qtest_add_func("/ide/flush/retry_pci", test_pci_retry_flush);
     qtest_add_func("/ide/flush/retry_isa", test_isa_retry_flush);
 
-- 
2.9.4

On 08/08/2017 12:57 PM, John Snow wrote:
> From: Kevin Wolf <kwolf@redhat.com>
> 
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> Signed-off-by: John Snow <jsnow@redhat.com>
> ---
>  tests/ide-test.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 

> +static void test_flush_empty_drive(void)
> +{
> +    QPCIDevice *dev;
> +    QPCIBar bmdma_bar, ide_bar;
> +
> +    ide_test_start("-device ide-cd,bus=ide.0");
> +    dev = get_pci_device(&bmdma_bar, &ide_bar);
> +
> +    /* FLUSH CACHE command on device 0*/

Space before */

Reviewed-by: Eric Blake <eblake@redhat.com>

I agree with your assessment of 1 and 2 being 2.10 material.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

On 08/08/2017 03:20 PM, Eric Blake wrote:
> On 08/08/2017 12:57 PM, John Snow wrote:
>> From: Kevin Wolf <kwolf@redhat.com>
>>
>> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
>> Signed-off-by: John Snow <jsnow@redhat.com>
>> ---
>>  tests/ide-test.c | 19 +++++++++++++++++++
>>  1 file changed, 19 insertions(+)
>>
> 
>> +static void test_flush_empty_drive(void)
>> +{
>> +    QPCIDevice *dev;
>> +    QPCIBar bmdma_bar, ide_bar;
>> +
>> +    ide_test_start("-device ide-cd,bus=ide.0");
>> +    dev = get_pci_device(&bmdma_bar, &ide_bar);
>> +
>> +    /* FLUSH CACHE command on device 0*/
> 
> Space before */
> 
> Reviewed-by: Eric Blake <eblake@redhat.com>
> 
> I agree with your assessment of 1 and 2 being 2.10 material.
> 

Yep, thanks. I just wanted to include Kevin's attempt at fixing the root
problem to make it clear that:

(A) The root problem is known and being worked on, but
(B) Is evidently not ready for prime time.

I'll stage 1 & 2 with your minor typo edit here, thank you.

--js

On Tue, Aug 08, 2017 at 01:57:09PM -0400, John Snow wrote:
> From: Kevin Wolf <kwolf@redhat.com>
> 
> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
> Signed-off-by: John Snow <jsnow@redhat.com>
> ---
>  tests/ide-test.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>