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| 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/advansys.c | |
| parent | 7ae65c0f9646c29432b69580b80e08632e6cd813 (diff) | |
| download | linux-74665016086615bbaa3fa6f83af410a0a4e029ee.tar.gz linux-74665016086615bbaa3fa6f83af410a0a4e029ee.tar.bz2 linux-74665016086615bbaa3fa6f83af410a0a4e029ee.zip | |
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/advansys.c')
| -rw-r--r-- | drivers/scsi/advansys.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/scsi/advansys.c b/drivers/scsi/advansys.c index e716d0aef194..43761c1c46f0 100644 --- a/drivers/scsi/advansys.c +++ b/drivers/scsi/advansys.c @@ -2512,7 +2512,7 @@ static void asc_prt_scsi_host(struct Scsi_Host *s) printk("Scsi_Host at addr 0x%p, device %s\n", s, dev_name(boardp->dev)); printk(" host_busy %u, host_no %d,\n", - s->host_busy, s->host_no); + atomic_read(&s->host_busy), s->host_no); printk(" base 0x%lx, io_port 0x%lx, irq %d,\n", (ulong)s->base, (ulong)s->io_port, boardp->irq); @@ -3346,7 +3346,7 @@ static void asc_prt_driver_conf(struct seq_file *m, struct Scsi_Host *shost) seq_printf(m, " host_busy %u, max_id %u, max_lun %llu, max_channel %u\n", - shost->host_busy, shost->max_id, + atomic_read(&shost->host_busy), shost->max_id, shost->max_lun, shost->max_channel); seq_printf(m, |