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| author | Alim Akhtar <alim.akhtar@samsung.com> | 2016-07-05 15:28:53 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-08-20 18:09:27 +0200 |
| commit | ef60c9aa980b59a61c5464cc38fdfaecdec61e47 (patch) | |
| tree | e1ad3721b2817e2a7192b2e7f4c5f8d0d1f78392 /drivers/rtc | |
| parent | 74d55e5d96aaecbff198b3f7bcdc10c1c865ce71 (diff) | |
| download | linux-stable-ef60c9aa980b59a61c5464cc38fdfaecdec61e47.tar.gz linux-stable-ef60c9aa980b59a61c5464cc38fdfaecdec61e47.tar.bz2 linux-stable-ef60c9aa980b59a61c5464cc38fdfaecdec61e47.zip | |
rtc: s3c: Add s3c_rtc_{enable/disable}_clk in s3c_rtc_setfreq()
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>
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-s3c.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c index ffb860d18701..f92528822f06 100644 --- a/drivers/rtc/rtc-s3c.c +++ b/drivers/rtc/rtc-s3c.c @@ -149,12 +149,14 @@ static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq) 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; } |