scsi: introduce scsi_req_cancel

This is for when the request must be dropped in the void,
but still memory should be freed.  To this end, the devices
register a second callback in SCSIBusOps.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/hw/scsi.h b/hw/scsi.h
index 970e8129c9..e2dc7cb5e1 100644
--- a/hw/scsi.h
+++ b/hw/scsi.h
@@ -78,6 +78,7 @@ struct SCSIDeviceInfo {
 
 struct SCSIBusOps {
     void (*complete)(SCSIRequest *req, int reason, uint32_t arg);
+    void (*cancel)(SCSIRequest *req);
 };
 
 struct SCSIBus {
@@ -115,6 +116,7 @@ void scsi_req_print(SCSIRequest *req);
 void scsi_req_data(SCSIRequest *req, int len);
 void scsi_req_complete(SCSIRequest *req);
 void scsi_req_abort(SCSIRequest *req, int status);
+void scsi_req_cancel(SCSIRequest *req);
 void scsi_device_purge_requests(SCSIDevice *sdev);
 
 #endif