linux-kernel - [115/117] [SCSI] Enable retries for SYNCRONIZE

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Message-Id: <20100510223327.761015986@kvm.kroah.org>
Date:	Mon, 10 May 2010 15:33:26 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Hannes Reinecke <hare@...e.de>,
	James Bottomley <James.Bottomley@...e.de>
Subject: [115/117] [SCSI] Enable retries for SYNCRONIZE_CACHE commands to fix I/O error

2.6.33-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Hannes Reinecke <hare@...e.de>

commit c213e1407be6b04b144794399a91472e0ef92aec upstream.

Some arrays are giving I/O errors with ext3 filesystems when
SYNCHRONIZE_CACHE gets a UNIT_ATTENTION.  What is happening is that
these commands have no retries, so the UNIT_ATTENTION causes the
barrier to fail.  We should be enable retries here to clear any
transient error and allow the barrier to succeed.

Signed-off-by: Hannes Reinecke <hare@...e.de>
Signed-off-by: James Bottomley <James.Bottomley@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/scsi/sd.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1039,6 +1039,7 @@ static void sd_prepare_flush(struct requ
 {
 	rq->cmd_type = REQ_TYPE_BLOCK_PC;
 	rq->timeout = SD_TIMEOUT;
+	rq->retries = SD_MAX_RETRIES;
 	rq->cmd[0] = SYNCHRONIZE_CACHE;
 	rq->cmd_len = 10;
 }


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