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| author | Thomas Gleixner <tglx@linutronix.de> | 2011-07-26 16:08:18 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-26 16:49:41 -0700 |
| commit | 2c4f57d12df7696d65b0247bfd57fd082a7719e6 (patch) | |
| tree | 920060fbbbc18643711e61526be4040e57118145 | |
| parent | b45d59fb92f60c9c3cda01355d42b907b863e47a (diff) | |
| download | linux-2c4f57d12df7696d65b0247bfd57fd082a7719e6.tar.gz linux-2c4f57d12df7696d65b0247bfd57fd082a7719e6.tar.bz2 linux-2c4f57d12df7696d65b0247bfd57fd082a7719e6.zip | |
rtc: handle errors correctly in rtc_irq_set_state()
The code checks the correctness of the parameters, but unconditionally
arms/disarms the hrtimer.
The result is that a random task might arm/disarm rtc timer and surprise
the real owner by either generating events or by stopping them.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Ben Greear <greearb@candelatech.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/rtc/interface.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index df68618f6dbb..b6bf57f25cc9 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -656,6 +656,8 @@ int rtc_irq_set_state(struct rtc_device *rtc, struct rtc_task *task, int enabled err = -EBUSY; if (rtc->irq_task != task) err = -EACCES; + if (err) + goto out; if (enabled) { ktime_t period = ktime_set(0, NSEC_PER_SEC/rtc->irq_freq); @@ -664,6 +666,7 @@ int rtc_irq_set_state(struct rtc_device *rtc, struct rtc_task *task, int enabled hrtimer_cancel(&rtc->pie_timer); } rtc->pie_enabled = enabled; +out: spin_unlock_irqrestore(&rtc->irq_task_lock, flags); return err; |