diff options
| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2008-04-17 09:24:39 -0400 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2008-04-17 09:24:39 -0400 |
| commit | d808fbe5b404854374917bd0d1db937a0a524665 (patch) | |
| tree | 936191d9dd7266444367a3029e121ed32665aa75 /drivers/input/touchscreen | |
| parent | 4db8a5f21e5149e09949516eef98b78b68880075 (diff) | |
Input: wm97xx-core - only schedule interrupt handler if not already scheduled
As well as clarifying the fact that the driver can cope if a second
interrupt occurs before the IRQ work is scheduled this also ensures
that calls to the machine irq_enable() are balanced, making that easier
to implement. Normally this is redundant due to the interrupt disabling
but some unusal board configurations can trigger it.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input/touchscreen')
| -rw-r--r-- | drivers/input/touchscreen/wm97xx-core.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/input/touchscreen/wm97xx-core.c b/drivers/input/touchscreen/wm97xx-core.c index 2910999e05a..e27b1e060b3 100644 --- a/drivers/input/touchscreen/wm97xx-core.c +++ b/drivers/input/touchscreen/wm97xx-core.c @@ -328,18 +328,18 @@ static void wm97xx_pen_irq_worker(struct work_struct *work) * * We have to disable the codec interrupt in the handler because it * can take upto 1ms to clear the interrupt source. We schedule a task - * in a work queue to do the actual interaction with the chip (it - * doesn't matter if we end up reenqueing it before it is executed - * since we don't touch the chip until it has run). The interrupt is - * then enabled again in the slow handler when the source has been - * cleared. + * in a work queue to do the actual interaction with the chip. The + * interrupt is then enabled again in the slow handler when the source + * has been cleared. */ static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id) { struct wm97xx *wm = dev_id; - wm->mach_ops->irq_enable(wm, 0); - queue_work(wm->ts_workq, &wm->pen_event_work); + if (!work_pending(&wm->pen_event_work)) { + wm->mach_ops->irq_enable(wm, 0); + queue_work(wm->ts_workq, &wm->pen_event_work); + } return IRQ_HANDLED; } |