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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2008-06-26 11:30:02 -0400 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2008-06-30 09:26:02 -0400 |
| commit | 656acd2bbc4ce7f224de499ee255698701396c48 (patch) | |
| tree | 8a6b0077d0bec8fec96ae3dfe28389c2909e6051 /drivers/input/ff-core.c | |
| parent | 4bbff7e408a54cce88d26191191e8bcda2a60d55 (diff) | |
| download | linux-656acd2bbc4ce7f224de499ee255698701396c48.tar.gz linux-656acd2bbc4ce7f224de499ee255698701396c48.tar.bz2 linux-656acd2bbc4ce7f224de499ee255698701396c48.zip | |
Input: fix locking in force-feedback core
The newly added event_lock spinlock in the input core disallows sleeping
and therefore using mutexes in event handlers. Convert force-feedback
core to rely on event_lock instead of mutex to protect slots allocated
for fore-feedback effects. The original mutex is still used to serialize
uploading and erasing of effects.
Reported-by: Anssi Hannula <anssi.hannula@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input/ff-core.c')
| -rw-r--r-- | drivers/input/ff-core.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/input/ff-core.c b/drivers/input/ff-core.c index eebc72465fc9..4c01464ec8f3 100644 --- a/drivers/input/ff-core.c +++ b/drivers/input/ff-core.c @@ -166,8 +166,10 @@ int input_ff_upload(struct input_dev *dev, struct ff_effect *effect, if (ret) goto out; + spin_lock_irq(&dev->event_lock); ff->effects[id] = *effect; ff->effect_owners[id] = file; + spin_unlock_irq(&dev->event_lock); out: mutex_unlock(&ff->mutex); @@ -189,16 +191,22 @@ static int erase_effect(struct input_dev *dev, int effect_id, if (error) return error; + spin_lock_irq(&dev->event_lock); ff->playback(dev, effect_id, 0); + ff->effect_owners[effect_id] = NULL; + spin_unlock_irq(&dev->event_lock); if (ff->erase) { error = ff->erase(dev, effect_id); - if (error) + if (error) { + spin_lock_irq(&dev->event_lock); + ff->effect_owners[effect_id] = file; + spin_unlock_irq(&dev->event_lock); + return error; + } } - ff->effect_owners[effect_id] = NULL; - return 0; } @@ -263,8 +271,6 @@ int input_ff_event(struct input_dev *dev, unsigned int type, if (type != EV_FF) return 0; - mutex_lock(&ff->mutex); - switch (code) { case FF_GAIN: if (!test_bit(FF_GAIN, dev->ffbit) || value > 0xffff) @@ -286,7 +292,6 @@ int input_ff_event(struct input_dev *dev, unsigned int type, break; } - mutex_unlock(&ff->mutex); return 0; } EXPORT_SYMBOL_GPL(input_ff_event); |