This is a note to let you know that I've just added the patch titled
rtc: s3c: Add s3c_rtc_{enable/disable}_clk in s3c_rtc_setfreq()
to the 4.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rtc-s3c-add-s3c_rtc_-enable-disable-_clk-in-s3c_rtc_setfreq.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 70c96dfac0e231424e17743bd52f6cd2ff1f2439 Mon Sep 17 00:00:00 2001
From: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>
Date: Tue, 5 Jul 2016 15:28:53 +0530
Subject: rtc: s3c: Add s3c_rtc_{enable/disable}_clk in s3c_rtc_setfreq()
From: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>
commit 70c96dfac0e231424e17743bd52f6cd2ff1f2439 upstream.
As per code flow s3c_rtc_setfreq() will get called with rtc clock disabled
and in set_freq we perform h/w registers read/write, which results in a
kernel crash on exynos7 platform while probing rtc driver.
Below is code flow:
s3c_rtc_probe()
clk_prepare_enable(info->rtc_clk) // rtc clock enabled
s3c_rtc_gettime() // will enable clk if not done, and disable it upon exit
s3c_rtc_setfreq() //then this will be called with clk disabled
This patch take cares of such issue by adding s3c_rtc_{enable/disable}_clk in
s3c_rtc_setfreq().
Fixes: 24e1455493da ("drivers/rtc/rtc-s3c.c: delete duplicate clock control")
Signed-off-by: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
Reviewed-by: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx>
Tested-by: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx>
Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/rtc/rtc-s3c.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -149,12 +149,14 @@ static int s3c_rtc_setfreq(struct s3c_rt
if (!is_power_of_2(freq))
return -EINVAL;
+ s3c_rtc_enable_clk(info);
spin_lock_irq(&info->pie_lock);
if (info->data->set_freq)
info->data->set_freq(info, freq);
spin_unlock_irq(&info->pie_lock);
+ s3c_rtc_disable_clk(info);
return 0;
}
Patches currently in stable-queue which might be from alim.akhtar@xxxxxxxxxxx are
queue-4.7/regulator-s2mps11-fix-the-voltage-linear-range-for-s2mps15.patch
queue-4.7/rtc-s3c-add-s3c_rtc_-enable-disable-_clk-in-s3c_rtc_setfreq.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html