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authorMark Brown <broonie@opensource.wolfsonmicro.com>2008-04-17 09:24:39 -0400
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2008-04-17 09:24:39 -0400
commitd808fbe5b404854374917bd0d1db937a0a524665 (patch)
tree936191d9dd7266444367a3029e121ed32665aa75 /drivers/input/touchscreen
parent4db8a5f21e5149e09949516eef98b78b68880075 (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.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/drivers/input/touchscreen/wm97xx-core.c b/drivers/input/touchscreen/wm97xx-core.c
index 2910999e05a0..e27b1e060b33 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;
}