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driver/rtc/class.c: check the error after rtc_read_time()

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In rtc_suspend() and rtc_resume(), the error after rtc_read_time() is not
checked.  If rtc device fail to read time, we cannot guarantee the
following process.

Add the verification code for returned rtc_read_time() error.

Signed-off-by: Hyogi Gim <hyogi.gim@lge.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hyogi Gim 2014-08-08 14:20:24 -07:00 committed by Linus Torvalds
parent 796b7abb33
commit e1d60093ca
1 changed files with 14 additions and 2 deletions
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16
drivers/rtc/class.c
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@ -53,6 +53,7 @@ static int rtc_suspend(struct device *dev)
struct rtc_device *rtc = to_rtc_device(dev);
struct rtc_time tm;
struct timespec delta, delta_delta;
int err;
if (has_persistent_clock())
return 0;
@ -61,7 +62,12 @@ static int rtc_suspend(struct device *dev)
return 0;
/* snapshot the current RTC and system time at suspend*/
rtc_read_time(rtc, &tm);
err = rtc_read_time(rtc, &tm);
if (err < 0) {
pr_debug("%s: fail to read rtc time\n", dev_name(&rtc->dev));
return 0;
}
getnstimeofday(&old_system);
rtc_tm_to_time(&tm, &old_rtc.tv_sec);
@ -94,6 +100,7 @@ static int rtc_resume(struct device *dev)
struct rtc_time tm;
struct timespec new_system, new_rtc;
struct timespec sleep_time;
int err;
if (has_persistent_clock())
return 0;
@ -104,7 +111,12 @@ static int rtc_resume(struct device *dev)
/* snapshot the current rtc and system time at resume */
getnstimeofday(&new_system);
rtc_read_time(rtc, &tm);
err = rtc_read_time(rtc, &tm);
if (err < 0) {
pr_debug("%s: fail to read rtc time\n", dev_name(&rtc->dev));
return 0;
}
if (rtc_valid_tm(&tm) != 0) {
pr_debug("%s: bogus resume time\n", dev_name(&rtc->dev));
return 0;