diff options
| author | Steven Rostedt <rostedt@goodmis.org> | 2012-03-01 13:55:29 -0500 |
|---|---|---|
| committer | Clark Williams <williams@redhat.com> | 2012-03-24 10:27:26 -0500 |
| commit | 2817073cd9dce3384a592f29ebeeac4b62303704 (patch) | |
| tree | 13232c745ea72481bc1519818c77555b3ddebcf7 | |
| parent | cbd341a882cbdaed863da0aa210a570e1594bf73 (diff) | |
futex/rt: Fix possible lockup when taking pi_lock in proxy handler
When taking the pi_lock, we must disable interrupts because the
pi_lock can also be taken in an interrupt handler.
Use raw_spin_lock_irq() instead of raw_spin_lock().
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Carsten Emde <C.Emde@osadl.org>
Cc: John Kacur <jkacur@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Clark Williams <clark.williams@gmail.com>
Cc: stable-rt@vger.kernel.org
Link: http://lkml.kernel.org/r/20120301190345.165160680@goodmis.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | kernel/rtmutex.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c index 9850dc02f1db..b52515820c1f 100644 --- a/kernel/rtmutex.c +++ b/kernel/rtmutex.c @@ -1373,14 +1373,14 @@ int rt_mutex_start_proxy_lock(struct rt_mutex *lock, * PI_REQUEUE_INPROGRESS, so that if the task is waking up * it will know that we are in the process of requeuing it. */ - raw_spin_lock(&task->pi_lock); + raw_spin_lock_irq(&task->pi_lock); if (task->pi_blocked_on) { - raw_spin_unlock(&task->pi_lock); + raw_spin_unlock_irq(&task->pi_lock); raw_spin_unlock(&lock->wait_lock); return -EAGAIN; } task->pi_blocked_on = PI_REQUEUE_INPROGRESS; - raw_spin_unlock(&task->pi_lock); + raw_spin_unlock_irq(&task->pi_lock); #endif ret = task_blocks_on_rt_mutex(lock, waiter, task, detect_deadlock); |