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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2009-11-06 21:39:07 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2009-11-10 21:13:32 -0800
commitbf3204cbff7d2606e758afb0994e8da6ae1c6c26 (patch)
tree01951b829d2af6a52b82bec35cc05261dcf77fe2 /drivers/input
parent558a5e296a02266ef43d6e933ee35df9976de987 (diff)
Input: fix locking in memoryless force-feedback devices
Now that input core acquires dev->event_lock spinlock and disables interrupts when propagating input events, using spin_lock_bh() in ff-memless driver is not allowed. Actually, the timer_lock itself is not needed anymore, we should simply use dev->event_lock as well. Also do a small cleanup in force-feedback core. Reported-by: kerneloops.org Reported-by: http://www.kerneloops.org/searchweek.php?search=ml_ff_set_gain Reported-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/ff-core.c20
-rw-r--r--drivers/input/ff-memless.c26
2 files changed, 22 insertions, 24 deletions
diff --git a/drivers/input/ff-core.c b/drivers/input/ff-core.c
index 72c63e5dd630..38df81fcdc3a 100644
--- a/drivers/input/ff-core.c
+++ b/drivers/input/ff-core.c
@@ -337,16 +337,16 @@ int input_ff_create(struct input_dev *dev, int max_effects)
dev->ff = ff;
dev->flush = flush_effects;
dev->event = input_ff_event;
- set_bit(EV_FF, dev->evbit);
+ __set_bit(EV_FF, dev->evbit);
/* Copy "true" bits into ff device bitmap */
for (i = 0; i <= FF_MAX; i++)
if (test_bit(i, dev->ffbit))
- set_bit(i, ff->ffbit);
+ __set_bit(i, ff->ffbit);
/* we can emulate RUMBLE with periodic effects */
if (test_bit(FF_PERIODIC, ff->ffbit))
- set_bit(FF_RUMBLE, dev->ffbit);
+ __set_bit(FF_RUMBLE, dev->ffbit);
return 0;
}
@@ -362,12 +362,14 @@ EXPORT_SYMBOL_GPL(input_ff_create);
*/
void input_ff_destroy(struct input_dev *dev)
{
- clear_bit(EV_FF, dev->evbit);
- if (dev->ff) {
- if (dev->ff->destroy)
- dev->ff->destroy(dev->ff);
- kfree(dev->ff->private);
- kfree(dev->ff);
+ struct ff_device *ff = dev->ff;
+
+ __clear_bit(EV_FF, dev->evbit);
+ if (ff) {
+ if (ff->destroy)
+ ff->destroy(ff);
+ kfree(ff->private);
+ kfree(ff);
dev->ff = NULL;
}
}
diff --git a/drivers/input/ff-memless.c b/drivers/input/ff-memless.c
index 2d1415e16834..b483b2995fa9 100644
--- a/drivers/input/ff-memless.c
+++ b/drivers/input/ff-memless.c
@@ -61,7 +61,6 @@ struct ml_device {
struct ml_effect_state states[FF_MEMLESS_EFFECTS];
int gain;
struct timer_list timer;
- spinlock_t timer_lock;
struct input_dev *dev;
int (*play_effect)(struct input_dev *dev, void *data,
@@ -368,38 +367,38 @@ static void ml_effect_timer(unsigned long timer_data)
{
struct input_dev *dev = (struct input_dev *)timer_data;
struct ml_device *ml = dev->ff->private;
+ unsigned long flags;
debug("timer: updating effects");
- spin_lock(&ml->timer_lock);
+ spin_lock_irqsave(&dev->event_lock, flags);
ml_play_effects(ml);
- spin_unlock(&ml->timer_lock);
+ spin_unlock_irqrestore(&dev->event_lock, flags);
}
+/*
+ * Sets requested gain for FF effects. Called with dev->event_lock held.
+ */
static void ml_ff_set_gain(struct input_dev *dev, u16 gain)
{
struct ml_device *ml = dev->ff->private;
int i;
- spin_lock_bh(&ml->timer_lock);
-
ml->gain = gain;
for (i = 0; i < FF_MEMLESS_EFFECTS; i++)
__clear_bit(FF_EFFECT_PLAYING, &ml->states[i].flags);
ml_play_effects(ml);
-
- spin_unlock_bh(&ml->timer_lock);
}
+/*
+ * Start/stop specified FF effect. Called with dev->event_lock held.
+ */
static int ml_ff_playback(struct input_dev *dev, int effect_id, int value)
{
struct ml_device *ml = dev->ff->private;
struct ml_effect_state *state = &ml->states[effect_id];
- unsigned long flags;
-
- spin_lock_irqsave(&ml->timer_lock, flags);
if (value > 0) {
debug("initiated play");
@@ -425,8 +424,6 @@ static int ml_ff_playback(struct input_dev *dev, int effect_id, int value)
ml_play_effects(ml);
}
- spin_unlock_irqrestore(&ml->timer_lock, flags);
-
return 0;
}
@@ -436,7 +433,7 @@ static int ml_ff_upload(struct input_dev *dev,
struct ml_device *ml = dev->ff->private;
struct ml_effect_state *state = &ml->states[effect->id];
- spin_lock_bh(&ml->timer_lock);
+ spin_lock_irq(&dev->event_lock);
if (test_bit(FF_EFFECT_STARTED, &state->flags)) {
__clear_bit(FF_EFFECT_PLAYING, &state->flags);
@@ -448,7 +445,7 @@ static int ml_ff_upload(struct input_dev *dev,
ml_schedule_timer(ml);
}
- spin_unlock_bh(&ml->timer_lock);
+ spin_unlock_irq(&dev->event_lock);
return 0;
}
@@ -482,7 +479,6 @@ int input_ff_create_memless(struct input_dev *dev, void *data,
ml->private = data;
ml->play_effect = play_effect;
ml->gain = 0xffff;
- spin_lock_init(&ml->timer_lock);
setup_timer(&ml->timer, ml_effect_timer, (unsigned long)dev);
set_bit(FF_GAIN, dev->ffbit);