Hi!
> > This adds support for touchscreen on Sharp Zaurus sl-5500. Vojtech,
> > please apply,
>
> I have couple more commnets...
Sorry, I never really worked with kthreads. Applied all those,
> > +static int ucb1x00_ts_open(struct input_dev *idev)
> > +{
> > + struct ucb1x00_ts *ts = (struct ucb1x00_ts *)idev;
> > + int ret = 0;
> > + struct task_struct *task;
> > +
> > + if (ts->rtask)
> > + panic("ucb1x00: rtask running?");
> > +
>
> Do you really need to panic here???
Does BUG_ON() seem better :-). We could also just return failure here,
but I do not see how it could happen => I guess I'd better catch it
with BUG().
Here's what I did, updated patch will follow.
Pavel
diff --git a/drivers/input/touchscreen/collie_ts.c b/drivers/input/touchscreen/collie_ts.c
--- a/drivers/input/touchscreen/collie_ts.c
+++ b/drivers/input/touchscreen/collie_ts.c
@@ -41,7 +41,6 @@ struct ucb1x00_ts {
struct ucb1x00 *ucb;
struct semaphore irq_wait;
- struct completion init_exit;
struct task_struct *rtask;
u16 x_res;
u16 y_res;
@@ -160,7 +159,6 @@ static int ucb1x00_thread(void *_ts)
int valid;
ts->rtask = tsk;
- allow_signal(SIGKILL);
/*
* We run as a real-time thread. However, thus far
@@ -169,10 +167,7 @@ static int ucb1x00_thread(void *_ts)
tsk->policy = SCHED_FIFO;
tsk->rt_priority = 1;
- complete(&ts->init_exit);
-
valid = 0;
-
for (;;) {
unsigned int x, y, p, val;
@@ -237,12 +232,12 @@ static int ucb1x00_thread(void *_ts)
msleep_interruptible(10);
}
- if (signal_pending(tsk))
+ if (kthread_should_stop())
break;
}
ts->rtask = NULL;
- complete_and_exit(&ts->init_exit, 0);
+ return 0;
}
/*
@@ -262,8 +257,7 @@ static int ucb1x00_ts_open(struct input_
int ret = 0;
struct task_struct *task;
- if (ts->rtask)
- panic("ucb1x00: rtask running?");
+ BUG_ON(ts->rtask);
sema_init(&ts->irq_wait, 0);
ret = ucb1x00_hook_irq(ts->ucb, UCB_IRQ_TSPX, ucb1x00_ts_irq, ts);
@@ -279,10 +273,8 @@ static int ucb1x00_ts_open(struct input_
ts->y_res = ucb1x00_ts_read_yres(ts);
ucb1x00_adc_disable(ts->ucb);
- init_completion(&ts->init_exit);
task = kthread_run(ucb1x00_thread, ts, "ktsd");
if (!IS_ERR(task)) {
- wait_for_completion(&ts->init_exit);
ret = 0;
} else {
ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts);
@@ -300,10 +292,8 @@ static void ucb1x00_ts_close(struct inpu
{
struct ucb1x00_ts *ts = (struct ucb1x00_ts *)idev;
- if (ts->rtask) {
- send_sig(SIGKILL, ts->rtask, 1);
- wait_for_completion(&ts->init_exit);
- }
+ if (ts->rtask)
+ kthread_stop(ts->rtask);
ucb1x00_enable(ts->ucb);
ucb1x00_free_irq(ts->ucb, UCB_IRQ_TSPX, ts);
--
teflon -- maybe it is a trademark, but it should not be.
-
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