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scsi: fix cancellation when I/O was completed but DMA was not.
Commit d577646 (scsi: Introduce scsi_req_cancel_complete, 2014-09-25) was supposed to have no semantic change, but it missed a case. When r->aiocb has already been NULLed, but DMA was not complete and the SCSI layer was waiting for scsi_req_continue, after the patch the SCSI layer will not call the .cancel callback of SCSIBusInfo. Fixes: d577646 Cc: qemu-stable@nongnu.org Reported-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Tested-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> (cherry picked from commit 488eef2) Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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