diff options
| author | Christoph Hellwig <hch@lst.de> | 2014-01-22 15:29:29 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2014-07-25 07:43:43 -0400 |
| commit | 74665016086615bbaa3fa6f83af410a0a4e029ee (patch) | |
| tree | 9f9d8a692bec91dce69fd303eeedf16c35b41ac6 /drivers/scsi/scsi.c | |
| parent | 7ae65c0f9646c29432b69580b80e08632e6cd813 (diff) | |
scsi: convert host_busy to atomic_t
Avoid taking the host-wide host_lock to check the per-host queue limit.
Instead we do an atomic_inc_return early on to grab our slot in the queue,
and if necessary decrement it after finishing all checks.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Webb Scales <webbnh@hp.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Tested-by: Bart Van Assche <bvanassche@acm.org>
Tested-by: Robert Elliott <elliott@hp.com>
Diffstat (limited to 'drivers/scsi/scsi.c')
| -rw-r--r-- | drivers/scsi/scsi.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 6200a2615436..21fb97b01dd6 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -600,7 +600,7 @@ void scsi_log_completion(struct scsi_cmnd *cmd, int disposition) if (level > 3) scmd_printk(KERN_INFO, cmd, "scsi host busy %d failed %d\n", - cmd->device->host->host_busy, + atomic_read(&cmd->device->host->host_busy), cmd->device->host->host_failed); } } |