diff options
| author | Leonid Shatz <leonid.shatz@ravellosystems.com> | 2013-02-04 12:33:37 (GMT) |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2013-02-05 10:52:41 (GMT) |
| commit | b22affe0aef429d657bc6505aacb1c569340ddd2 (patch) | |
| tree | 6cdb5271ab0f4d02ccca8130fb0c0de8f61fe37a /arch/x86/lib/delay.c | |
| parent | 90889a635a9b5488624bccce3ff6b2eec68c007b (diff) | |
| download | linux-fsl-qoriq-b22affe0aef429d657bc6505aacb1c569340ddd2.tar.xz | |
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 <leonid.shatz@ravellosystems.com>
Signed-off-by: Izik Eidus <izik.eidus@ravellosystems.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1359981217-389-1-git-send-email-izik.eidus@ravellosystems.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/lib/delay.c')
0 files changed, 0 insertions, 0 deletions