diff options
| author | Jean Delvare <khali@linux-fr.org> | 2009-03-07 07:42:12 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-03-30 12:43:17 -0300 |
| commit | 569b7ec73abf576f9a9e4070d213aadf2cce73cb (patch) | |
| tree | b84ef4286f669db0e072745f0ceb99bd619035b2 | |
| parent | fb6991d417a9f06978119ea597dc5955b3eb784d (diff) | |
V4L/DVB (10943): cx88: Prevent general protection fault on rmmod
When unloading the cx8800 driver I sometimes get a general protection
fault. Analysis revealed a race in cx88_ir_stop(). It can be solved by
using a delayed work instead of a timer for infrared input polling.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
| -rw-r--r-- | drivers/media/video/cx88/cx88-input.c | 25 |
1 files changed, 7 insertions, 18 deletions
diff --git a/drivers/media/video/cx88/cx88-input.c b/drivers/media/video/cx88/cx88-input.c index ad0842136d8..ec05312a9b6 100644 --- a/drivers/media/video/cx88/cx88-input.c +++ b/drivers/media/video/cx88/cx88-input.c @@ -48,8 +48,7 @@ struct cx88_IR { /* poll external decoder */ int polling; - struct work_struct work; - struct timer_list timer; + struct delayed_work work; u32 gpio_addr; u32 last_gpio; u32 mask_keycode; @@ -143,27 +142,19 @@ static void cx88_ir_handle_key(struct cx88_IR *ir) } } -static void ir_timer(unsigned long data) -{ - struct cx88_IR *ir = (struct cx88_IR *)data; - - schedule_work(&ir->work); -} - static void cx88_ir_work(struct work_struct *work) { - struct cx88_IR *ir = container_of(work, struct cx88_IR, work); + struct cx88_IR *ir = container_of(work, struct cx88_IR, work.work); cx88_ir_handle_key(ir); - mod_timer(&ir->timer, jiffies + msecs_to_jiffies(ir->polling)); + schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); } void cx88_ir_start(struct cx88_core *core, struct cx88_IR *ir) { if (ir->polling) { - setup_timer(&ir->timer, ir_timer, (unsigned long)ir); - INIT_WORK(&ir->work, cx88_ir_work); - schedule_work(&ir->work); + INIT_DELAYED_WORK(&ir->work, cx88_ir_work); + schedule_delayed_work(&ir->work, 0); } if (ir->sampling) { core->pci_irqmask |= PCI_INT_IR_SMPINT; @@ -179,10 +170,8 @@ void cx88_ir_stop(struct cx88_core *core, struct cx88_IR *ir) core->pci_irqmask &= ~PCI_INT_IR_SMPINT; } - if (ir->polling) { - del_timer_sync(&ir->timer); - flush_scheduled_work(); - } + if (ir->polling) + cancel_delayed_work_sync(&ir->work); } /* ---------------------------------------------------------------------- */ |