scsi: Introduce scsi_req_cancel_complete

Let the aio cb do the clean up and notification job after scsi_req_cancel, in
preparation for asynchronous cancellation.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 10 insertions, 4 deletions

diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
index 764f6cf3b5..c91db63696 100644
--- a/hw/scsi/scsi-bus.c
+++ b/hw/scsi/scsi-bus.c
@@ -1718,6 +1718,16 @@ void scsi_req_complete(SCSIRequest *req, int status)
     scsi_req_unref(req);
 }
 
+/* Called by the devices when the request is canceled. */
+void scsi_req_cancel_complete(SCSIRequest *req)
+{
+    assert(req->io_canceled);
+    if (req->bus->info->cancel) {
+        req->bus->info->cancel(req);
+    }
+    scsi_req_unref(req);
+}
+
 void scsi_req_cancel(SCSIRequest *req)
 {
     trace_scsi_req_cancel(req->dev->id, req->lun, req->tag);
@@ -1730,10 +1740,6 @@ void scsi_req_cancel(SCSIRequest *req)
     if (req->aiocb) {
         bdrv_aio_cancel(req->aiocb);
     }
-    if (req->bus->info->cancel) {
-        req->bus->info->cancel(req);
-    }
-    scsi_req_unref(req);
 }
 
 static int scsi_ua_precedence(SCSISense sense)