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| author | Peter Zijlstra <peterz@infradead.org> | 2014-10-29 16:17:12 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-11-04 07:17:47 +0100 |
| commit | eedf7e47daa0b8530246a8c9107c007fbf8231bf (patch) | |
| tree | e945f8690e964eb998089519a8aff192e090f494 /net/bluetooth/rfcomm | |
| parent | 6b55fc63f46ba299f3d84013e9232be4bd259eab (diff) | |
| download | linux-stable-eedf7e47daa0b8530246a8c9107c007fbf8231bf.tar.gz linux-stable-eedf7e47daa0b8530246a8c9107c007fbf8231bf.tar.bz2 linux-stable-eedf7e47daa0b8530246a8c9107c007fbf8231bf.zip | |
rfcomm, sched/wait: Fix broken wait construct
rfcomm_run() is a tad broken in that is has a nested wait loop. One
cannot rely on p->state for the outer wait because the inner wait will
overwrite it.
Fix this using the new wait_woken() facility.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Alexander Holler <holler@ahsoftware.de>
Cc: David S. Miller <davem@davemloft.net>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Joe Perches <joe@perches.com>
Cc: Johan Hedberg <johan.hedberg@gmail.com>
Cc: Libor Pechacek <lpechacek@suse.cz>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Vignesh Raman <Vignesh_Raman@mentor.com>
Cc: linux-bluetooth@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/bluetooth/rfcomm')
| -rw-r--r-- | net/bluetooth/rfcomm/core.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/net/bluetooth/rfcomm/core.c b/net/bluetooth/rfcomm/core.c index af73bc3acb40..410dd5e76c41 100644 --- a/net/bluetooth/rfcomm/core.c +++ b/net/bluetooth/rfcomm/core.c @@ -101,11 +101,11 @@ static struct rfcomm_session *rfcomm_session_del(struct rfcomm_session *s); #define __get_rpn_stop_bits(line) (((line) >> 2) & 0x1) #define __get_rpn_parity(line) (((line) >> 3) & 0x7) +static DECLARE_WAIT_QUEUE_HEAD(rfcomm_wq); + static void rfcomm_schedule(void) { - if (!rfcomm_thread) - return; - wake_up_process(rfcomm_thread); + wake_up_all(&rfcomm_wq); } /* ---- RFCOMM FCS computation ---- */ @@ -2086,24 +2086,22 @@ static void rfcomm_kill_listener(void) static int rfcomm_run(void *unused) { + DEFINE_WAIT_FUNC(wait, woken_wake_function); BT_DBG(""); set_user_nice(current, -10); rfcomm_add_listener(BDADDR_ANY); - while (1) { - set_current_state(TASK_INTERRUPTIBLE); - - if (kthread_should_stop()) - break; + add_wait_queue(&rfcomm_wq, &wait); + while (!kthread_should_stop()) { /* Process stuff */ rfcomm_process_sessions(); - schedule(); + wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); } - __set_current_state(TASK_RUNNING); + remove_wait_queue(&rfcomm_wq, &wait); rfcomm_kill_listener(); |