linux-kernel - [PATCH 1/3] rtc: ds1685: fix crash caused by referencing wrong device struct

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Date:   Thu, 11 Apr 2019 16:33:21 +0200
From:   Thomas Bogendoerfer <tbogendoerfer@...e.de>
To:     Joshua Kinard <kumba@...too.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] rtc: ds1685: fix crash caused by referencing wrong device struct

sysfs entries added by rtc_add_group are called with the rtc device
as argument and not the underlying device. Fixed by using the dev->parent

Fixes: cfb74916e2ec ("rtc: ds1685: use rtc_add_group")
Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@...e.de>
---
 drivers/rtc/rtc-ds1685.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-ds1685.c b/drivers/rtc/rtc-ds1685.c
index 2710f2594c42..2f5194df239e 100644
--- a/drivers/rtc/rtc-ds1685.c
+++ b/drivers/rtc/rtc-ds1685.c
@@ -1004,7 +1004,7 @@ static ssize_t
 ds1685_rtc_sysfs_battery_show(struct device *dev,
 			      struct device_attribute *attr, char *buf)
 {
-	struct ds1685_priv *rtc = dev_get_drvdata(dev);
+	struct ds1685_priv *rtc = dev_get_drvdata(dev->parent);
 	u8 ctrld;
 
 	ctrld = rtc->read(rtc, RTC_CTRL_D);
@@ -1024,7 +1024,7 @@ static ssize_t
 ds1685_rtc_sysfs_auxbatt_show(struct device *dev,
 			      struct device_attribute *attr, char *buf)
 {
-	struct ds1685_priv *rtc = dev_get_drvdata(dev);
+	struct ds1685_priv *rtc = dev_get_drvdata(dev->parent);
 	u8 ctrl4a;
 
 	ds1685_rtc_switch_to_bank1(rtc);
@@ -1046,7 +1046,7 @@ static ssize_t
 ds1685_rtc_sysfs_serial_show(struct device *dev,
 			     struct device_attribute *attr, char *buf)
 {
-	struct ds1685_priv *rtc = dev_get_drvdata(dev);
+	struct ds1685_priv *rtc = dev_get_drvdata(dev->parent);
 	u8 ssn[8];
 
 	ds1685_rtc_switch_to_bank1(rtc);
-- 
2.13.7