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>

diff --git a/drivers/media/video/cx88/cx88-input.c b/drivers/media/video/cx88/cx88-input.c
index ad08421..ec05312 100644 (file)
--- 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);
 }
 
 /* ---------------------------------------------------------------------- */