From 656acd2bbc4ce7f224de499ee255698701396c48 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Thu, 26 Jun 2008 11:30:02 -0400 Subject: [PATCH] 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 Signed-off-by: Dmitry Torokhov --- drivers/input/ff-core.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/drivers/input/ff-core.c b/drivers/input/ff-core.c index eebc72465f..4c01464ec8 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); -- 2.39.5