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

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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>
This commit is contained in:
Matt Bondurant 2012-05-01 11:42:35 -05:00 committed by James Bottomley
parent 2c17d2da8c
commit 852af20aa6
1 changed files with 12 additions and 1 deletions
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13
drivers/scsi/hpsa.c
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@ -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);
}