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authorJames Bottomley <jbottomley@parallels.com>2013-10-04 21:42:24 (GMT)
committerJames Bottomley <JBottomley@Parallels.com>2013-10-25 08:58:16 (GMT)
commit7e660100d85af860e7ad763202fff717adcdaacd (patch)
tree851008ff72523b38313ddc4609001904e7d400d9 /drivers/scsi/sd.c
parentd078b5117f18dce57b895df640d9bf2614864829 (diff)
downloadlinux-7e660100d85af860e7ad763202fff717adcdaacd.tar.xz
[SCSI] Derive the FLUSH_TIMEOUT from the basic I/O timeout
Rather than having a separate constant for specifying the timeout on FLUSH operations, use the basic I/O timeout value that is already configurable on a per target basis to derive the FLUSH timeout. Looking at the current definitions of these timeout values, the FLUSH operation is supposed to have a value that is twice the normal timeout value. This patch preserves this relationship while leveraging the flexibility of specifying the I/O timeout. Based on a prior patch by KY Srinivasan <kys@microsoft.com> Reviewed-by: KY Srinivasan <kys@microsoft.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/sd.c')
-rw-r--r--drivers/scsi/sd.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 3824e75..fd874b8 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -830,7 +830,7 @@ static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
{
- rq->timeout = SD_FLUSH_TIMEOUT;
+ rq->timeout *= SD_FLUSH_TIMEOUT_MULTIPLIER;
rq->retries = SD_MAX_RETRIES;
rq->cmd[0] = SYNCHRONIZE_CACHE;
rq->cmd_len = 10;
@@ -1434,6 +1434,8 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
{
int retries, res;
struct scsi_device *sdp = sdkp->device;
+ const int timeout = sdp->request_queue->rq_timeout
+ * SD_FLUSH_TIMEOUT_MULTIPLIER;
struct scsi_sense_hdr sshdr;
if (!scsi_device_online(sdp))
@@ -1448,8 +1450,8 @@ static int sd_sync_cache(struct scsi_disk *sdkp)
* flush everything.
*/
res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
- &sshdr, SD_FLUSH_TIMEOUT,
- SD_MAX_RETRIES, NULL, REQ_PM);
+ &sshdr, timeout, SD_MAX_RETRIES,
+ NULL, REQ_PM);
if (res == 0)
break;
}