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| author | Chandra Seetharaman <sekharan@us.ibm.com> | 2008-11-05 20:06:37 -0800 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-12-29 11:24:15 -0600 |
| commit | c85f8cb9254e60cd25a094329c9dc9185c2140e7 (patch) | |
| tree | 9e1ebf4f6d8b0cdf3264f8a49bc97c36bf17c753 /drivers/scsi/device_handler | |
| parent | 9eece961fc646e2652086dae42650d002e2d27e2 (diff) | |
| download | linux-c85f8cb9254e60cd25a094329c9dc9185c2140e7.tar.gz | |
[SCSI] scsi_dh: Retry mode select in rdac device handler
When the mode select sent to the controller fails with the retryable error, it is better to retry the mode_select from the hardware handler itself, instead of propagating the failure to dm-multipath. Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/device_handler')
| -rw-r--r-- | drivers/scsi/device_handler/scsi_dh_rdac.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c index ff07559c5fcd..3e16a33927cf 100644 --- a/drivers/scsi/device_handler/scsi_dh_rdac.c +++ b/drivers/scsi/device_handler/scsi_dh_rdac.c @@ -24,6 +24,7 @@ #include <scsi/scsi_dh.h> #define RDAC_NAME "rdac" +#define RDAC_RETRY_COUNT 5 /* * LSI mode page stuff @@ -478,21 +479,27 @@ static int send_mode_select(struct scsi_device *sdev, struct rdac_dh_data *h) { struct request *rq; struct request_queue *q = sdev->request_queue; - int err = SCSI_DH_RES_TEMP_UNAVAIL; + int err, retry_cnt = RDAC_RETRY_COUNT; +retry: + err = SCSI_DH_RES_TEMP_UNAVAIL; rq = rdac_failover_get(sdev, h); if (!rq) goto done; - sdev_printk(KERN_INFO, sdev, "queueing MODE_SELECT command.\n"); + sdev_printk(KERN_INFO, sdev, "%s MODE_SELECT command.\n", + (retry_cnt == RDAC_RETRY_COUNT) ? "queueing" : "retrying"); err = blk_execute_rq(q, NULL, rq, 1); - if (err != SCSI_DH_OK) + blk_put_request(rq); + if (err != SCSI_DH_OK) { err = mode_select_handle_sense(sdev, h->sense); + if (err == SCSI_DH_RETRY && retry_cnt--) + goto retry; + } if (err == SCSI_DH_OK) h->state = RDAC_STATE_ACTIVE; - blk_put_request(rq); done: return err; } |