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Subject: [media] saa7134: simplify timer activation Author: Sean Young <[email protected]> Date: Mon Aug 13 08:59:48 2012 -0300 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 <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> drivers/media/video/saa7134/saa7134-input.c | 10 +++------- drivers/media/video/saa7134/saa7134.h | 1 - 2 files changed, 3 insertions(+), 8 deletions(-) --- http://git.linuxtv.org/media_tree.git?a=commitdiff;h=4da212e2ffaa34edb887a3a86424124fe8341e34 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 saa7134_input_timer(unsigned long data) 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 @@ static int __saa7134_ir_start(void *priv) } ir->running = true; - ir->active = false; if (ir->polling) { setup_timer(&ir->timer, saa7134_input_timer, @@ -532,7 +528,6 @@ static void __saa7134_ir_stop(void *priv) if (ir->polling || ir->raw_decode) del_timer_sync(&ir->timer); - ir->active = false; ir->running = false; return; @@ -1035,10 +1030,11 @@ static int saa7134_raw_decode_irq(struct saa7134_dev *dev) * 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 @@ struct saa7134_card_ir { u32 mask_keycode, mask_keydown, mask_keyup; bool running; - bool active; struct timer_list timer; _______________________________________________ linuxtv-commits mailing list [email protected] http://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
