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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-06-29 23:10:47 +0300
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-08-17 18:08:58 +0300
commita4f08141d0b876407ca4e4b0ae1b2dec35851532 (patch)
treeaee8baf463c6af954a7ba76b070800795651b60c /drivers/ata
parente0892e086aae8d86e33dc8fb87f3d36c901df574 (diff)
downloadlinux-a4f08141d0b876407ca4e4b0ae1b2dec35851532.tar.xz
drivers/ata: Replace spin_unlock_wait() with lock/unlock pair
There is no agreed-upon definition of spin_unlock_wait()'s semantics, and it appears that all callers could do just as well with a lock/unlock pair. This commit therefore eliminates the spin_unlock_wait() call and associated else-clause and hoists the then-clause's lock and unlock out of the "if" statement. This should be safe from a performance perspective because according to Tejun there should be few if any drivers that don't set their own error handler. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Tejun Heo <tj@kernel.org> Cc: <linux-ide@vger.kernel.org> Cc: Will Deacon <will.deacon@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Andrea Parri <parri.andrea@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/libata-eh.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index b70bcf6d2914..b325db27eb8c 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -645,12 +645,11 @@ void ata_scsi_cmd_error_handler(struct Scsi_Host *host, struct ata_port *ap,
* completions are honored. A scmd is determined to have
* timed out iff its associated qc is active and not failed.
*/
+ spin_lock_irqsave(ap->lock, flags);
if (ap->ops->error_handler) {
struct scsi_cmnd *scmd, *tmp;
int nr_timedout = 0;
- spin_lock_irqsave(ap->lock, flags);
-
/* This must occur under the ap->lock as we don't want
a polled recovery to race the real interrupt handler
@@ -700,12 +699,11 @@ void ata_scsi_cmd_error_handler(struct Scsi_Host *host, struct ata_port *ap,
if (nr_timedout)
__ata_port_freeze(ap);
- spin_unlock_irqrestore(ap->lock, flags);
/* initialize eh_tries */
ap->eh_tries = ATA_EH_MAX_TRIES;
- } else
- spin_unlock_wait(ap->lock);
+ }
+ spin_unlock_irqrestore(ap->lock, flags);
}
EXPORT_SYMBOL(ata_scsi_cmd_error_handler);