From: Hannes Reinecke Date: Tue, 4 May 2010 14:49:21 +0000 (+0200) Subject: [SCSI] Enable retries for SYNCRONIZE_CACHE commands to fix I/O error X-Git-Tag: v2.6.34-rc7~1^2~1 X-Git-Url: https://git.kernelconcepts.de/?a=commitdiff_plain;h=c213e1407be6b04b144794399a91472e0ef92aec;p=karo-tx-linux.git [SCSI] Enable retries for SYNCRONIZE_CACHE commands to fix I/O error 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 Cc: Stable Tree Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 8b827f37b03e..de6c60320f6f 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1040,6 +1040,7 @@ static void sd_prepare_flush(struct request_queue *q, struct request *rq) { 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; }