fnic: IOMMU Fault occurs when IO and abort IO is out of order

When I/O is aborted by mid-layer, fnic FW will complete the I/O before
completing the abort task. In some cases abort request is completed before
the I/O, which could lead to inconsistent driver and firmware states.
In this case firmware reset would clear the inconsistent state.

Signed-off-by: Anil Chintalapati <achintal@cisco.com>
Signed-off-by: Sesidhar Baddela <sebaddel@cisco.com>
Signed-off-by: Hiral Shah <hishah@cisco.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

2 files changed, 16 insertions, 1 deletions

diff --git a/drivers/scsi/fnic/fnic.h b/drivers/scsi/fnic/fnic.h
index 3b73b96619e2..26270c351624 100644
--- a/drivers/scsi/fnic/fnic.h
+++ b/drivers/scsi/fnic/fnic.h
@@ -39,7 +39,7 @@
 
 #define DRV_NAME                "fnic"
 #define DRV_DESCRIPTION         "Cisco FCoE HBA Driver"
-#define DRV_VERSION             "1.6.0.16"
+#define DRV_VERSION             "1.6.0.17"
 #define PFX                     DRV_NAME ": "
 #define DFX                     DRV_NAME "%d: "
 
diff --git a/drivers/scsi/fnic/fnic_scsi.c b/drivers/scsi/fnic/fnic_scsi.c
index 2097de42a147..155b286f1a9d 100644
--- a/drivers/scsi/fnic/fnic_scsi.c
+++ b/drivers/scsi/fnic/fnic_scsi.c
@@ -1892,6 +1892,21 @@ int fnic_abort_cmd(struct scsi_cmnd *sc)
                 goto fnic_abort_cmd_end;
         }
 
+        /* IO out of order */
+
+        if (!(CMD_FLAGS(sc) & (FNIC_IO_ABORTED | FNIC_IO_DONE))) {
+                spin_unlock_irqrestore(io_lock, flags);
+                FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
+                        "Issuing Host reset due to out of order IO\n");
+
+                if (fnic_host_reset(sc) == FAILED) {
+                        FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
+                                "fnic_host_reset failed.\n");
+                }
+                ret = FAILED;
+                goto fnic_abort_cmd_end;
+        }
+
         CMD_STATE(sc) = FNIC_IOREQ_ABTS_COMPLETE;
 
         /*