Commit ea05fea9 authored by Daniel Drake's avatar Daniel Drake Committed by John W. Linville

Bluetooth: btmrvl: fix thread stopping race

There is currently a race condition in the btmrvl_remove_card() which
is causing hangs on suspend for OLPC. When the race occurs,
kthread_stop() never returns.

The problem is that btmrvl_service_main_thread() calls kthread_should_stop()
and then does a fair number of things before restarting the loop and
sleeping.

If the thread gets stopped after kthread_should_stop() is checked, but
before the sleep happens, the thread will go to sleep and won't necessarily
be woken up.

Move the kthread_should_stop() check into a race-free place.
Signed-off-by: 's avatarDaniel Drake <dsd@laptop.org>
Signed-off-by: 's avatarGustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: 's avatarJohn W. Linville <linville@tuxdriver.com>
parent 59f45d57
......@@ -498,6 +498,10 @@ static int btmrvl_service_main_thread(void *data)
add_wait_queue(&thread->wait_q, &wait);
set_current_state(TASK_INTERRUPTIBLE);
if (kthread_should_stop()) {
BT_DBG("main_thread: break from main thread");
break;
}
if (adapter->wakeup_tries ||
((!adapter->int_count) &&
......@@ -513,11 +517,6 @@ static int btmrvl_service_main_thread(void *data)
BT_DBG("main_thread woke up");
if (kthread_should_stop()) {
BT_DBG("main_thread: break from main thread");
break;
}
spin_lock_irqsave(&priv->driver_lock, flags);
if (adapter->int_count) {
adapter->int_count = 0;
......
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