[SCSI] hpsa: retry driver initiated commands on busy status

In shared SAS configurations we might get a busy status
during driver initiated commands (e.g. during rescan for
devices).  We should retry the command in such cases rather
than giving up.

Signed-off-by: Matt Bondurant <Matthew.dav.bondurant@hp.com>
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 5e8c7ca02be8..cc586972dd9c 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -234,6 +234,16 @@ static int check_for_unit_attention(struct ctlr_info *h,
         return 1;
 }
 
+static int check_for_busy(struct ctlr_info *h, struct CommandList *c)
+{
+        if (c->err_info->CommandStatus != CMD_TARGET_STATUS ||
+                (c->err_info->ScsiStatus != SAM_STAT_BUSY &&
+                 c->err_info->ScsiStatus != SAM_STAT_TASK_SET_FULL))
+                return 0;
+        dev_warn(&h->pdev->dev, HPSA "device busy");
+        return 1;
+}
+
 static ssize_t host_store_rescan(struct device *dev,
                                  struct device_attribute *attr,
                                  const char *buf, size_t count)
@@ -1379,7 +1389,8 @@ static void hpsa_scsi_do_simple_cmd_with_retry(struct ctlr_info *h,
                 memset(c->err_info, 0, sizeof(*c->err_info));
                 hpsa_scsi_do_simple_cmd_core(h, c);
                 retry_count++;
-        } while (check_for_unit_attention(h, c) && retry_count <= 3);
+        } while ((check_for_unit_attention(h, c) ||
+                        check_for_busy(h, c)) && retry_count <= 3);
         hpsa_pci_unmap(h->pdev, c, 1, data_direction);
 }