linux-kernel - [PATCH 06/17] hpsa: retry driver initiated commands on busy status

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Message-ID: <20120501164235.11705.46187.stgit@beardog.cce.hp.com>
Date:	Tue, 01 May 2012 11:42:35 -0500
From:	"Stephen M. Cameron" <scameron@...rdog.cce.hp.com>
To:	james.bottomley@...senpartnership.com
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	stephenmcameron@...il.com, thenzl@...hat.com,
	akpm@...ux-foundation.org, mikem@...rdog.cce.hp.com
Subject: [PATCH 06/17] hpsa: retry driver initiated commands on busy status

From: Matt Bondurant <Matthew.dav.bondurant@...com>

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@...com>
Signed-off-by: Stephen M. Cameron <scameron@...rdog.cce.hp.com>
---
 drivers/scsi/hpsa.c |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 9e09717..5015ac4 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);
 }
 

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