diff options
| author | Hyogi Gim <hyogi.gim@lge.com> | 2014-08-08 14:20:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-08-08 15:57:20 -0700 |
| commit | e1d60093ca7341e884578c41a29da7cd1714c80e (patch) | |
| tree | 505e4dbbc5f60276f7e3059af72723c00ad95c4d /drivers/rtc/class.c | |
| parent | 796b7abb33cd78412897a9e927eb5a8f5a9c4fe6 (diff) | |
| download | lwn-e1d60093ca7341e884578c41a29da7cd1714c80e.tar.gz lwn-e1d60093ca7341e884578c41a29da7cd1714c80e.zip | |
driver/rtc/class.c: check the error after rtc_read_time()
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>
Diffstat (limited to 'drivers/rtc/class.c')
| -rw-r--r-- | drivers/rtc/class.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c index 589351ef75d0..38e26be705be 100644 --- a/drivers/rtc/class.c +++ b/drivers/rtc/class.c @@ -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; |