[media] saa7134: simplify timer activation
This simplies the code and resolves a possible race condition between
ir_raw_decode_timer_end() and saa7134_raw_decode_irq().
If the interrupt handler is called after ir_raw_decode_timer_end()
calls ir_raw_event_handle() but before clearing ir->active, then the
timer won't be rearmed.
Compile tested only.
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/saa7134/saa7134-input.c b/drivers/media/video/saa7134/saa7134-input.c
index 05c6e21..0f78f5e 100644
--- a/drivers/media/video/saa7134/saa7134-input.c
+++ b/drivers/media/video/saa7134/saa7134-input.c
@@ -446,11 +446,8 @@
static void ir_raw_decode_timer_end(unsigned long data)
{
struct saa7134_dev *dev = (struct saa7134_dev *)data;
- struct saa7134_card_ir *ir = dev->remote;
ir_raw_event_handle(dev->remote->dev);
-
- ir->active = false;
}
static int __saa7134_ir_start(void *priv)
@@ -501,7 +498,6 @@
}
ir->running = true;
- ir->active = false;
if (ir->polling) {
setup_timer(&ir->timer, saa7134_input_timer,
@@ -532,7 +528,6 @@
if (ir->polling || ir->raw_decode)
del_timer_sync(&ir->timer);
- ir->active = false;
ir->running = false;
return;
@@ -1035,10 +1030,11 @@
* the event. This time is enough for NEC protocol. May need adjustments
* to work with other protocols.
*/
- if (!ir->active) {
+ smp_mb();
+
+ if (!timer_pending(&ir->timer)) {
timeout = jiffies + msecs_to_jiffies(15);
mod_timer(&ir->timer, timeout);
- ir->active = true;
}
return 1;
diff --git a/drivers/media/video/saa7134/saa7134.h b/drivers/media/video/saa7134/saa7134.h
index 89c8333..c24b651 100644
--- a/drivers/media/video/saa7134/saa7134.h
+++ b/drivers/media/video/saa7134/saa7134.h
@@ -130,7 +130,6 @@
u32 mask_keycode, mask_keydown, mask_keyup;
bool running;
- bool active;
struct timer_list timer;