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| author | Mike Christie <michaelc@cs.wisc.edu> | 2009-10-16 04:46:44 +0400 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2009-12-04 21:00:42 +0300 |
| commit | 42a6a91833f1e0f5ee5b5ef98e9f00167b615f46 (patch) | |
| tree | 6173edb1fd2e4579d3223c7e3be1d0cc8430457c /drivers/scsi | |
| parent | e881a172dac4d9ea3b2a1540041d872963c269bd (diff) | |
| download | linux-42a6a91833f1e0f5ee5b5ef98e9f00167b615f46.tar.xz | |
[SCSI] scsi error: have scsi-ml call change_queue_depth to handle QUEUE_FULL
This has scsi-ml call the change_queue_depth functions when
we get a QUEUE_FULL. It will only change the queue depth if
change_queue_depth is set because the LLD may have to
modify some internal resources, so I thought this would
be the safest route.
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
-v2
Limits change_queue_depth to only all luns of target by adding
channel check while iterating for all luns of Scsi_Host. This is
same as currently qla2xxx FC HBA does on QUEUE_FULL event.
Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/scsi_error.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index 1b0060b791e8..7b1e20fee906 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -331,6 +331,28 @@ static int scsi_check_sense(struct scsi_cmnd *scmd) } } +static void scsi_handle_queue_full(struct scsi_device *sdev) +{ + struct scsi_host_template *sht = sdev->host->hostt; + struct scsi_device *tmp_sdev; + + if (!sht->change_queue_depth) + return; + + shost_for_each_device(tmp_sdev, sdev->host) { + if (tmp_sdev->channel != sdev->channel || + tmp_sdev->id != sdev->id) + continue; + /* + * We do not know the number of commands that were at + * the device when we got the queue full so we start + * from the highest possible value and work our way down. + */ + sht->change_queue_depth(tmp_sdev, tmp_sdev->queue_depth - 1, + SCSI_QDEPTH_QFULL); + } +} + /** * scsi_eh_completed_normally - Disposition a eh cmd on return from LLD. * @scmd: SCSI cmd to examine. @@ -387,8 +409,10 @@ static int scsi_eh_completed_normally(struct scsi_cmnd *scmd) * let issuer deal with this, it could be just fine */ return SUCCESS; - case BUSY: case QUEUE_FULL: + scsi_handle_queue_full(scmd->device); + /* fall through */ + case BUSY: default: return FAILED; } @@ -1387,6 +1411,7 @@ int scsi_decide_disposition(struct scsi_cmnd *scmd) */ switch (status_byte(scmd->result)) { case QUEUE_FULL: + scsi_handle_queue_full(scmd->device); /* * the case of trying to send too many commands to a * tagged queueing device. |