This has sd_sync_cache have scsi-ml retry errors instead of driving them
itself.
There is one behavior change where we no longer retry when
scsi_execute_cmd returns < 0, but we should be ok. We don't need to retry
for failures like the queue being removed, and for the case where there
are no tags/reqs the block layer waits/retries for us. For possible memory
allocation failures from blk_rq_map_kern we use GFP_NOIO, so retrying
will probably not help.
Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx>
---
drivers/scsi/sd.c | 35 +++++++++++++++++------------------
1 file changed, 17 insertions(+), 18 deletions(-)
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index cda0d029ab7f..0d73145430a4 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1645,36 +1645,35 @@ static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
static int sd_sync_cache(struct scsi_disk *sdkp)
{
- int retries, res;
+ int res;
struct scsi_device *sdp = sdkp->device;
const int timeout = sdp->request_queue->rq_timeout
* SD_FLUSH_TIMEOUT_MULTIPLIER;
+ /* Leave the rest of the command zero to indicate flush everything. */
+ const unsigned char cmd[16] = { sdp->use_16_for_sync ?
+ SYNCHRONIZE_CACHE_16 : SYNCHRONIZE_CACHE };
struct scsi_sense_hdr sshdr;
+ struct scsi_failure failure_defs[] = {
+ {
+ .allowed = 3,
+ .result = SCMD_FAILURE_RESULT_ANY,
+ },
+ {}
+ };
+ struct scsi_failures failures = {
+ .failure_definitions = failure_defs,
+ };
const struct scsi_exec_args exec_args = {
.req_flags = BLK_MQ_REQ_PM,
.sshdr = &sshdr,
+ .failures = &failures,
};
if (!scsi_device_online(sdp))
return -ENODEV;
- for (retries = 3; retries > 0; --retries) {
- unsigned char cmd[16] = { 0 };
-
- if (sdp->use_16_for_sync)
- cmd[0] = SYNCHRONIZE_CACHE_16;
- else
- cmd[0] = SYNCHRONIZE_CACHE;
- /*
- * Leave the rest of the command zero to indicate
- * flush everything.
- */
- res = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0,
- timeout, sdkp->max_retries, &exec_args);
- if (res == 0)
- break;
- }
-
+ res = scsi_execute_cmd(sdp, cmd, REQ_OP_DRV_IN, NULL, 0, timeout,
+ sdkp->max_retries, &exec_args);
if (res) {
sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
--
2.34.1
