From: Mike Christie Date: Wed, 11 Aug 2010 16:06:25 +0000 (-0500) Subject: [SCSI] scsi/block: increase flush/sync timeout X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=e3b3e6246726cd05950677ed843010b8e8c5884c;p=linux-beck.git [SCSI] scsi/block: increase flush/sync timeout We have been seeing the flush request timeout with a wide range of hardware from tgt+iser to FC targets from a major vendor. After discussions about if the value should be configurable and what the best value should be, this patch just increases the flush/sync cache timeout to 1 minute. 2 minutes was determined to be too long, and making it configurable was troublesome for users. This patch was made over Linus's tree. It is not made over scsi-misc or scsi-rc-fixes, because Linus's had block layer changes that my patch was built over. Signed-off-by: Mike Christie Acked-by: Jens Axboe Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 2714becc2eaf..8c9b275f71a7 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -477,7 +477,7 @@ static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq) static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq) { - rq->timeout = SD_TIMEOUT; + rq->timeout = SD_FLUSH_TIMEOUT; rq->retries = SD_MAX_RETRIES; rq->cmd[0] = SYNCHRONIZE_CACHE; rq->cmd_len = 10; @@ -1072,7 +1072,7 @@ static int sd_sync_cache(struct scsi_disk *sdkp) * flush everything. */ res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, - SD_TIMEOUT, SD_MAX_RETRIES, NULL); + SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL); if (res == 0) break; } diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h index f81a9309e6de..315ce9d96b1f 100644 --- a/drivers/scsi/sd.h +++ b/drivers/scsi/sd.h @@ -19,6 +19,7 @@ */ #define SD_TIMEOUT (30 * HZ) #define SD_MOD_TIMEOUT (75 * HZ) +#define SD_FLUSH_TIMEOUT (60 * HZ) /* * Number of allowed retries