linux-kernel - [PATCH 3.10 213/268] rtc: s35390a: make sure all members in the output are set

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Date:   Mon, 19 Jun 2017 20:31:52 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Uwe Kleine-König <uwe@...ine-koenig.org>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 213/268] rtc: s35390a: make sure all members in the output are set

From: Uwe Kleine-König <uwe@...ine-koenig.org>

commit ac4d4f65bbcba478309de36929016d2618421ba1 upstream.

The rtc core calls the .read_alarm with all fields initialized to 0. As
the s35390a driver doesn't touch some fields the returned date is
interpreted as a date in January 1900. So make sure all fields are set
to -1; some of them are then overwritten with the right data depending
on the hardware state.

In mainline this is done by commit d68778b80dd7 ("rtc: initialize output
parameter for read alarm to "uninitialized"") in the core. This is
considered to dangerous for stable as it might have side effects for
other rtc drivers that might for example rely on alarm->time.tm_sec
being initialized to 0.

Signed-off-by: Uwe Kleine-König <uwe@...ine-koenig.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/rtc/rtc-s35390a.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/rtc/rtc-s35390a.c b/drivers/rtc/rtc-s35390a.c
index f40afdd0..eae8bf2 100644
--- a/drivers/rtc/rtc-s35390a.c
+++ b/drivers/rtc/rtc-s35390a.c
@@ -265,6 +265,20 @@ static int s35390a_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alm)
 	char buf[3], sts;
 	int i, err;

+	/*
+	 * initialize all members to -1 to signal the core that they are not
+	 * defined by the hardware.
+	 */
+	alm->time.tm_sec = -1;
+	alm->time.tm_min = -1;
+	alm->time.tm_hour = -1;
+	alm->time.tm_mday = -1;
+	alm->time.tm_mon = -1;
+	alm->time.tm_year = -1;
+	alm->time.tm_wday = -1;
+	alm->time.tm_yday = -1;
+	alm->time.tm_isdst = -1;
+
 	err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));
 	if (err < 0)
 		return err;
-- 
2.8.0.rc2.1.gbe9624a