diff mbox

[3/7,linux-next] powerpc/pmac: replace current->state by set_current_state()

Message ID 1424455977-21903-3-git-send-email-fabf@skynet.be (mailing list archive)
State Accepted
Commit 111fbc68fd895ba437bcb03d5dcc4dd21bc61df8
Headers show

Commit Message

Fabian Frederick Feb. 20, 2015, 6:12 p.m. UTC 
Use helper functions to access current->state.
Direct assignments are prone to races and therefore buggy.

current->state = TASK_RUNNING can be replaced by __set_current_state()

Thanks to Peter Zijlstra for the exact definition of the problem.

Suggested-By: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Fabian Frederick <fabf@skynet.be>
---
 drivers/macintosh/via-pmu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c
index dee88e5..3c608d4 100644
--- a/drivers/macintosh/via-pmu.c
+++ b/drivers/macintosh/via-pmu.c
@@ -2109,7 +2109,7 @@  pmu_read(struct file *file, char __user *buf,
 
 	spin_lock_irqsave(&pp->lock, flags);
 	add_wait_queue(&pp->wait, &wait);
-	current->state = TASK_INTERRUPTIBLE;
+	set_current_state(TASK_INTERRUPTIBLE);
 
 	for (;;) {
 		ret = -EAGAIN;
@@ -2138,7 +2138,7 @@  pmu_read(struct file *file, char __user *buf,
 		schedule();
 		spin_lock_irqsave(&pp->lock, flags);
 	}
-	current->state = TASK_RUNNING;
+	__set_current_state(TASK_RUNNING);
 	remove_wait_queue(&pp->wait, &wait);
 	spin_unlock_irqrestore(&pp->lock, flags);