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drivers/rtc/interface.c: check the validation of rtc_time in __rtc_read_time

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Some rtc devices always return '0' when rtc_class_ops.read_time is
called.  So if rtc_time isn't verified in callback, rtc interface cannot
know whether rtc_time is valid.

Check rtc_time by using 'rtc_valid_tm' in '__rtc_read_time'.  And add
the message for debugging.

Signed-off-by: Hyogi Gim <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Cc: John Stultz <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hyogi Gim 2014-12-10 15:52:27 -08:00 • committed by Linus Torvalds
commit 16682c86d2
1 changed files with 8 additions and 0 deletions
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8
drivers/rtc/interface.c
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@ -30,6 +30,14 @@ static int __rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm)
else {
memset(tm, 0, sizeof(struct rtc_time));
err = rtc->ops->read_time(rtc->dev.parent, tm);
if (err < 0) {
dev_err(&rtc->dev, "read_time: fail to read\n");
return err;
}
err = rtc_valid_tm(tm);
if (err < 0)
dev_err(&rtc->dev, "read_time: rtc_time isn't valid\n");
}
return err;
}