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scsi-disk: release AioContext in unaligned WRITE SAME case

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scsi_write_same_complete() can retry the write if the request was
unaligned.  Make sure to release the AioContext when that code path is
taken!

This patch fixes a hang when QEMU terminates after an unaligned WRITE
SAME request has been processed with dataplane.  The hang occurs because
iothread_stop_all() cannot acquire the AioContext lock that was leaked
by the IOThread in scsi_write_same_complete().

Fixes: b9e413dd37 ("block: explicitly acquire aiocontext in aio callbacks that need it").
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-stable@nongnu.org
Reported-by: Cong Li <coli@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20180104142502.15175-1-stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2018-01-04 14:25:02 +00:00 committed by Paolo Bonzini
parent 02a2ad217b
commit 24355b79bd
1 changed files with 1 additions and 0 deletions
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hw/scsi/scsi-disk.c
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@ -1755,6 +1755,7 @@ static void scsi_write_same_complete(void *opaque, int ret)
data->sector << BDRV_SECTOR_BITS,
&data->qiov, 0,
scsi_write_same_complete, data);
aio_context_release(blk_get_aio_context(s->qdev.conf.blk));
return;
}