diff options
| author | Daniel Drake <dsd@laptop.org> | 2013-06-11 15:40:20 -0400 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2013-06-13 13:05:40 -0400 |
| commit | ea05fea9042620ac3b8ab9a3e5e4d2ed80c89244 (patch) | |
| tree | a5f6856405fb195854847a660c50d51bbcacaf1f | |
| parent | 59f45d576a0715026d1919ab8a12047616204656 (diff) | |
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: Daniel Drake <dsd@laptop.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
| -rw-r--r-- | drivers/bluetooth/btmrvl_main.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/bluetooth/btmrvl_main.c b/drivers/bluetooth/btmrvl_main.c index 3a4343b3bd6d..9a9f51875df5 100644 --- a/drivers/bluetooth/btmrvl_main.c +++ b/drivers/bluetooth/btmrvl_main.c @@ -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; |