diff options
| author | Leonid Shatz <[email protected]> | 2013-02-04 14:33:37 +0200 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2013-02-05 11:52:41 +0100 |
| commit | b22affe0aef429d657bc6505aacb1c569340ddd2 (patch) | |
| tree | 6cdb5271ab0f4d02ccca8130fb0c0de8f61fe37a /kernel/posix-cpu-timers.c | |
| parent | 90889a635a9b5488624bccce3ff6b2eec68c007b (diff) | |
hrtimer: Prevent hrtimer_enqueue_reprogram race
hrtimer_enqueue_reprogram contains a race which could result in
timer.base switch during unlock/lock sequence.
hrtimer_enqueue_reprogram is releasing the lock protecting the timer
base for calling raise_softirq_irqsoff() due to a lock ordering issue
versus rq->lock.
If during that time another CPU calls __hrtimer_start_range_ns() on
the same hrtimer, the timer base might switch, before the current CPU
can lock base->lock again and therefor the unlock_timer_base() call
will unlock the wrong lock.
[ tglx: Added comment and massaged changelog ]
Signed-off-by: Leonid Shatz <[email protected]>
Signed-off-by: Izik Eidus <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
Diffstat (limited to 'kernel/posix-cpu-timers.c')
0 files changed, 0 insertions, 0 deletions