linux-kernel - [PATCH] drivers/rtc/interface.c: check the error after __rtc_read

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Message-ID: <20141217031524.GA22361@lge.com>
Date:	Wed, 17 Dec 2014 12:15:24 +0900
From:	Hyogi Gim <hyogi.gim@....com>
To:	a.zummo@...ertech.it, akpm@...ux-foundation.org
Cc:	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: [PATCH] drivers/rtc/interface.c: check the error after
 __rtc_read_time()

Add the verification code for returned __rtc_read_time() error in
rtc_update_irq_enable() and rtc_timer_do_work().

Signed-off-by: Hyogi Gim <hyogi.gim@....com>
---
 drivers/rtc/interface.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 45bfc28ee..fa1f119 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -489,7 +489,10 @@ int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled)
 		struct rtc_time tm;
 		ktime_t now, onesec;
 
-		__rtc_read_time(rtc, &tm);
+		err = __rtc_read_time(rtc, &tm);
+		if (err < 0)
+			goto out;
+
 		onesec = ktime_set(1, 0);
 		now = rtc_tm_to_ktime(tm);
 		rtc->uie_rtctimer.node.expires = ktime_add(now, onesec);
@@ -867,13 +870,17 @@ void rtc_timer_do_work(struct work_struct *work)
 	struct timerqueue_node *next;
 	ktime_t now;
 	struct rtc_time tm;
+	int err = 0;
 
 	struct rtc_device *rtc =
 		container_of(work, struct rtc_device, irqwork);
 
 	mutex_lock(&rtc->ops_lock);
 again:
-	__rtc_read_time(rtc, &tm);
+	err = __rtc_read_time(rtc, &tm);
+	if (err < 0)
+		goto out;
+
 	now = rtc_tm_to_ktime(tm);
 	while ((next = timerqueue_getnext(&rtc->timerqueue))) {
 		if (next->expires.tv64 > now.tv64)
@@ -898,7 +905,6 @@ again:
 	/* Set next alarm */
 	if (next) {
 		struct rtc_wkalrm alarm;
-		int err;
 		int retry = 3;
 
 		alarm.time = rtc_ktime_to_tm(next->expires);
@@ -920,6 +926,7 @@ reprogram:
 	} else
 		rtc_alarm_disable(rtc);
 
+out:
 	pm_relax(rtc->dev.parent);
 	mutex_unlock(&rtc->ops_lock);
 }
-- 
1.8.3.2


-- 
Hyogi

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