[Qemu-devel] [PULL 2/5] virtio-scsi: Cleanup of I/Os that never started

[Paolo Bonzini <pbonzini@redhat.com>]

From: Eric Farman <farman@linux.vnet.ibm.com>

There is still a small window that occurs when a cancel I/O affects
an asynchronous I/O operation that hasn't started.  In other words,
when the residual data length equals the expected data length.

Today, the routine virtio_scsi_command_complete fails because the
VirtIOSCSIReq pointer (from the hba_private field in SCSIRequest)
was cleared earlier when virtio_scsi_complete_req was called by
the virtio_scsi_request_cancelled routine.  As a result, the
virtio_scsi_command_complete routine needs to simply return when
it is processing a SCSIRequest block that was marked canceled.

Signed-off-by: Eric Farman <farman@linux.vnet.ibm.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/scsi/virtio-scsi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
index 6dcdd1b..1da98cd 100644
--- a/hw/scsi/virtio-scsi.c
+++ b/hw/scsi/virtio-scsi.c
@@ -306,6 +306,10 @@ static void virtio_scsi_command_complete(SCSIRequest *r, uint32_t status,
     VirtIOSCSIReq *req = r->hba_private;
     uint32_t sense_len;
 
+    if (r->io_canceled) {
+        return;
+    }
+
     req->resp.cmd->response = VIRTIO_SCSI_S_OK;
     req->resp.cmd->status = status;
     if (req->resp.cmd->status == GOOD) {
-- 
1.8.3.1