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| author | Aaro Koskinen <aaro.koskinen@nokia.com> | 2011-03-23 23:48:19 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2011-03-23 23:50:36 -0700 |
| commit | a0fa2206f550066d6948d43c5401e973e5f7d320 (patch) | |
| tree | 48afd4cf19e8b552e9f0a2c68eea87e4b662a680 /drivers | |
| parent | 903427955b9ffe1ca4b76c510089774c3b7a4a8a (diff) | |
| download | linux-a0fa2206f550066d6948d43c5401e973e5f7d320.tar.bz2 | |
Input: tsc2005 - fix locking issue
Commit 0b950d3 (Input: tsc2005 - add open/close) introduced a
locking issue with the ESD watchdog: __tsc2005_disable() is calling
cancel_delayed_work_sync() with mutex held, and the work also needs the
same mutex.
Fix the problem by using mutex_trylock() in tsc2005_esd_work(). If the
mutex is taken, we know we are in the middle of disable or enable and
the watchdog check can be skipped.
Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/input/touchscreen/tsc2005.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/input/touchscreen/tsc2005.c b/drivers/input/touchscreen/tsc2005.c index 2a9a7260fe8e..cbf0ff322676 100644 --- a/drivers/input/touchscreen/tsc2005.c +++ b/drivers/input/touchscreen/tsc2005.c @@ -477,7 +477,14 @@ static void tsc2005_esd_work(struct work_struct *work) int error; u16 r; - mutex_lock(&ts->mutex); + if (!mutex_trylock(&ts->mutex)) { + /* + * If the mutex is taken, it means that disable or enable is in + * progress. In that case just reschedule the work. If the work + * is not needed, it will be canceled by disable. + */ + goto reschedule; + } if (time_is_after_jiffies(ts->last_valid_interrupt + msecs_to_jiffies(ts->esd_timeout))) @@ -510,11 +517,12 @@ static void tsc2005_esd_work(struct work_struct *work) tsc2005_start_scan(ts); out: + mutex_unlock(&ts->mutex); +reschedule: /* re-arm the watchdog */ schedule_delayed_work(&ts->esd_work, round_jiffies_relative( msecs_to_jiffies(ts->esd_timeout))); - mutex_unlock(&ts->mutex); } static int tsc2005_open(struct input_dev *input) |