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Subject[PATCH 30/37] Input: wm97xx-core - only schedule interrupt handler if not already scheduled
From
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>
---
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 2910999..e27b1e0 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;
}
--
1.5.5.rc2.6.gf58d



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