From e1d60093ca7341e884578c41a29da7cd1714c80e Mon Sep 17 00:00:00 2001 From: Hyogi Gim Date: Fri, 8 Aug 2014 14:20:24 -0700 Subject: [PATCH] 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 Cc: Alessandro Zummo Cc: "Rafael J. Wysocki" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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 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; -- 2.34.1