[SCSI] libsas: Start I_T recovery if ABORT TASK fails

The EH should fall into I_T recovery (and potentially stronger
remedies) if ABORT TASK fails.

Signed-off-by: Alexis Bruemmer <alexisb@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 8a1b98e3943c..9ffe7605fb9d 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -281,6 +281,7 @@ enum task_disposition {
         TASK_IS_ABORTED,
         TASK_IS_AT_LU,
         TASK_IS_NOT_AT_LU,
+        TASK_ABORT_FAILED,
 };
 
 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
@@ -331,15 +332,21 @@ static enum task_disposition sas_scsi_find_task(struct sas_task *task)
                         SAS_DPRINTK("%s: querying task 0x%p\n",
                                     __FUNCTION__, task);
                         res = si->dft->lldd_query_task(task);
-                        if (res == TMF_RESP_FUNC_SUCC) {
+                        switch (res) {
+                        case TMF_RESP_FUNC_SUCC:
                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
                                             __FUNCTION__, task);
                                 return TASK_IS_AT_LU;
-                        } else if (res == TMF_RESP_FUNC_COMPLETE) {
+                        case TMF_RESP_FUNC_COMPLETE:
                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
                                             __FUNCTION__, task);
                                 return TASK_IS_NOT_AT_LU;
-                        }
+                        case TMF_RESP_FUNC_FAILED:
+                                SAS_DPRINTK("%s: task 0x%p failed to abort\n",
+                                                __FUNCTION__, task);
+                                return TASK_ABORT_FAILED;
+                        }
+
                 }
         }
         return res;
@@ -475,6 +482,7 @@ Again:
                         }
                         /* fallthrough */
                 case TASK_IS_NOT_AT_LU:
+                case TASK_ABORT_FAILED:
                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
                                     task);
                         tmf_resp = sas_recover_I_T(task->dev);