From f263bac9f7181df80b732b7bc11a7a4e38ca962f Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Sat, 7 Mar 2009 07:43:01 -0300 Subject: [PATCH] V4L/DVB (10938): em28xx: Prevent general protection fault on rmmod The removal of the timer which polls the infrared input is racy. Replacing the timer with a delayed work solves the problem. Signed-off-by: Jean Delvare Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/em28xx/em28xx-input.c | 22 ++++++---------------- 1 file changed, 6 insertions(+), 16 deletions(-) diff --git a/drivers/media/video/em28xx/em28xx-input.c b/drivers/media/video/em28xx/em28xx-input.c index 0443afe09ff..a5abfd7a19f 100644 --- a/drivers/media/video/em28xx/em28xx-input.c +++ b/drivers/media/video/em28xx/em28xx-input.c @@ -68,8 +68,7 @@ struct em28xx_IR { /* poll external decoder */ int polling; - struct work_struct work; - struct timer_list timer; + struct delayed_work work; unsigned int last_toggle:1; unsigned int last_readcount; unsigned int repeat_interval; @@ -292,32 +291,23 @@ static void em28xx_ir_handle_key(struct em28xx_IR *ir) return; } -static void ir_timer(unsigned long data) -{ - struct em28xx_IR *ir = (struct em28xx_IR *)data; - - schedule_work(&ir->work); -} - static void em28xx_ir_work(struct work_struct *work) { - struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work); + struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work); em28xx_ir_handle_key(ir); - mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling)); + schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); } static void em28xx_ir_start(struct em28xx_IR *ir) { - setup_timer(&ir->timer, ir_timer, (unsigned long)ir); - INIT_WORK(&ir->work, em28xx_ir_work); - schedule_work(&ir->work); + INIT_DELAYED_WORK(&ir->work, em28xx_ir_work); + schedule_delayed_work(&ir->work, 0); } static void em28xx_ir_stop(struct em28xx_IR *ir) { - del_timer_sync(&ir->timer); - flush_scheduled_work(); + cancel_delayed_work_sync(&ir->work); } int em28xx_ir_init(struct em28xx *dev) -- 2.41.1