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authorChristoph Hellwig <hch@lst.de>2014-01-22 18:29:29 +0400
committerChristoph Hellwig <hch@lst.de>2014-07-25 15:43:43 +0400
commit74665016086615bbaa3fa6f83af410a0a4e029ee (patch)
tree9f9d8a692bec91dce69fd303eeedf16c35b41ac6 /drivers/scsi/advansys.c
parent7ae65c0f9646c29432b69580b80e08632e6cd813 (diff)
downloadlinux-74665016086615bbaa3fa6f83af410a0a4e029ee.tar.xz
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.c4
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,