Messages in this thread Patch in this message | | | From | Hyogi Gim <> | Subject | [PATCH] driver/rtc/class.c: check the error after rtc_read_time() | Date | Tue, 15 Jul 2014 17:25:23 +0900 |
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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> --- drivers/rtc/class.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c index 589351e..38e26be 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; -- 1.8.3.2
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