input: replace spin_lock_bh with spin_lock_irqsave in ml_ff_playback
ml_ff_playback() uses spin_(un)lock_bh. However this function is called
with interrupts disabled from erase_effect() in drivers/input/ff-core.c:196.
This is not permitted, and will result in a WARN_ON in the bottom half handling code.
This patch changes this function to just use spin_lock_irqsave() instead, solving
the problem and simplifying the locking logic.
This was reported as entry #106559 in kerneloops.org
Reported-by: kerneloops.org
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/input/ff-memless.c b/drivers/input/ff-memless.c
index 6790e97..bc4e40f 100644
--- a/drivers/input/ff-memless.c
+++ b/drivers/input/ff-memless.c
@@ -397,8 +397,9 @@
{
struct ml_device *ml = dev->ff->private;
struct ml_effect_state *state = &ml->states[effect_id];
+ unsigned long flags;
- spin_lock_bh(&ml->timer_lock);
+ spin_lock_irqsave(&ml->timer_lock, flags);
if (value > 0) {
debug("initiated play");
@@ -424,7 +425,7 @@
ml_play_effects(ml);
}
- spin_unlock_bh(&ml->timer_lock);
+ spin_unlock_irqrestore(&ml->timer_lock, flags);
return 0;
}