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V4L/DVB (10939): ir-kbd-i2c: Prevent general protection fault on rmmod

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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 <khali@linux-fr.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Jean Delvare 2009-03-07 07:43:43 -03:00 committed by Mauro Carvalho Chehab
parent f263bac9f7
commit c1089bdc07
2 changed files with 6 additions and 17 deletions
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20
drivers/media/video/ir-kbd-i2c.c
View File

@ -279,15 +279,9 @@ static void ir_key_poll(struct IR_i2c *ir)
}
}
static void ir_timer(unsigned long data)
{
struct IR_i2c *ir = (struct IR_i2c*)data;
schedule_work(&ir->work);
}
static void ir_work(struct work_struct *work)
{
struct IR_i2c *ir = container_of(work, struct IR_i2c, work);
struct IR_i2c *ir = container_of(work, struct IR_i2c, work.work);
int polling_interval = 100;
/* MSI TV@nywhere Plus requires more frequent polling
@ -296,7 +290,7 @@ static void ir_work(struct work_struct *work)
polling_interval = 50;
ir_key_poll(ir);
mod_timer(&ir->timer, jiffies + msecs_to_jiffies(polling_interval));
schedule_delayed_work(&ir->work, msecs_to_jiffies(polling_interval));
}
/* ----------------------------------------------------------------------- */
@ -452,11 +446,8 @@ static int ir_attach(struct i2c_adapter *adap, int addr,
ir->input->name, ir->input->phys, adap->name);
/* start polling via eventd */
INIT_WORK(&ir->work, ir_work);
init_timer(&ir->timer);
ir->timer.function = ir_timer;
ir->timer.data = (unsigned long)ir;
schedule_work(&ir->work);
INIT_DELAYED_WORK(&ir->work, ir_work);
schedule_delayed_work(&ir->work, 0);
return 0;
@ -473,8 +464,7 @@ static int ir_detach(struct i2c_client *client)
struct IR_i2c *ir = i2c_get_clientdata(client);
/* kill outstanding polls */
del_timer_sync(&ir->timer);
flush_scheduled_work();
cancel_delayed_work_sync(&ir->work);
/* unregister devices */
input_unregister_device(ir->input);

3
include/media/ir-kbd-i2c.h
View File

@ -14,8 +14,7 @@ struct IR_i2c {
/* Used to avoid fast repeating */
unsigned char old;
struct work_struct work;
struct timer_list timer;
struct delayed_work work;
char phys[32];
int (*get_key)(struct IR_i2c*, u32*, u32*);
};