[PATCH 4.4 135/138] rtc: s3c: Add s3c_rtc_{enable/disable}_clk in s3c_rtc_setfreq()

Greg Kroah-Hartman
2016-08-18T14:19:53Z

From: Alim Akhtar <alim.akhtar@samsung.com>

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@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Tested-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
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;
}