[PATCH] xen_pvscsi: reclaim the ring request when mapping data failed

[Bin Wu]

During scsi command queueing, if mapping data fails, we need to
reclaim the failed request. Otherwise, the garbage request will
be pushed into the ring for the backend to work.

Signed-off-by: Bin Wu <wu.wubin@xxxxxxxxxx>
---
 drivers/scsi/xen-scsifront.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/xen-scsifront.c b/drivers/scsi/xen-scsifront.c
index 9dc8687..655163d 100644
--- a/drivers/scsi/xen-scsifront.c
+++ b/drivers/scsi/xen-scsifront.c
@@ -565,6 +565,7 @@ static int scsifront_queuecommand(struct Scsi_Host *shost,
     err = map_data_for_request(info, sc, ring_req, shadow);
     if (err < 0) {
         pr_debug("%s: err %d\n", __func__, err);
+        info->ring.req_prod_pvt--;
         scsifront_put_rqid(info, rqid);
         scsifront_return(info);
         spin_unlock_irqrestore(shost->host_lock, flags);
--
2.3.2 (Apple Git-55)