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Commit c213e140 authored by Hannes Reinecke's avatar Hannes Reinecke Committed by James Bottomley
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[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: default avatarHannes Reinecke <hare@suse.de>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
parent 5447ed6c

drivers/scsi/sd.c

+1 −0
Original line number Diff line number Diff line
@@ -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;

}