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| author | Xunlei Pang <pang.xunlei@linaro.org> | 2014-12-10 15:54:26 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-10 17:41:16 -0800 |
| commit | 6528b889955d36caa06712789746cfbd0ecf3898 (patch) | |
| tree | c17dacc3c12b081cc396b37738c09acf22fb4113 /drivers/rtc | |
| parent | c594d6787919692001ac7c16f08646a8ec36180a (diff) | |
| download | linux-6528b889955d36caa06712789746cfbd0ecf3898.tar.gz linux-6528b889955d36caa06712789746cfbd0ecf3898.tar.bz2 linux-6528b889955d36caa06712789746cfbd0ecf3898.zip | |
rtc: refine rtc_timer_do_work() to consider other set alarm failures
rtc_timer_do_work() only judges -ETIME failure of__rtc_set_alarm(), but
doesn't handle other failures like -EIO, -EBUSY, etc.
If there is a failure other than -ETIME, the next rtc_timer will stay in
the timerqueue. Then later rtc_timers will be enqueued directly because
they have a later expires time, so the alarm irq will never be programmed.
When such failures happen, this patch will retry __rtc_set_alarm(), if
still can't program the alarm time, it will remove current rtc_timer from
timerqueue and fetch next one, thus preventing it from affecting other rtc
timers.
Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Arnd Bergmann <arnd.bergmann@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/interface.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index 818ea97f403c..45bfc28ee3aa 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -899,11 +899,24 @@ again: if (next) { struct rtc_wkalrm alarm; int err; + int retry = 3; + alarm.time = rtc_ktime_to_tm(next->expires); alarm.enabled = 1; +reprogram: err = __rtc_set_alarm(rtc, &alarm); if (err == -ETIME) goto again; + else if (err) { + if (retry-- > 0) + goto reprogram; + + timer = container_of(next, struct rtc_timer, node); + timerqueue_del(&rtc->timerqueue, &timer->node); + timer->enabled = 0; + dev_err(&rtc->dev, "__rtc_set_alarm: err=%d\n", err); + goto again; + } } else rtc_alarm_disable(rtc); |