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| author | Ivan Kokshaysky <ink@jurassic.park.msu.ru> | 2020-06-20 19:44:49 +0300 |
|---|---|---|
| committer | Viresh Kumar <viresh.kumar@linaro.org> | 2020-07-30 08:27:45 +0300 |
| commit | 10470dec3decaf5ed3c596f85debd7c42777ae12 (patch) | |
| tree | 068d2a864861570e1c1c421c56f90480598ef643 | |
| parent | d48461b2c7c39c89dec598e6ea6e188fdaf418e7 (diff) | |
| download | linux-10470dec3decaf5ed3c596f85debd7c42777ae12.tar.xz | |
cpufreq: dt: fix oops on armada37xx
Commit 0c868627e617e43a295d8 (cpufreq: dt: Allow platform specific
intermediate callbacks) added two function pointers to the
struct cpufreq_dt_platform_data. However, armada37xx_cpufreq_driver_init()
has this struct (pdata) located on the stack and uses only "suspend"
and "resume" fields. So these newly added "get_intermediate" and
"target_intermediate" pointers are uninitialized and contain arbitrary
non-null values, causing all kinds of trouble.
For instance, here is an oops on espressobin after an attempt to change
the cpefreq governor:
[ 29.174554] Unable to handle kernel execute from non-executable memory at virtual address ffff00003f87bdc0
...
[ 29.269373] pc : 0xffff00003f87bdc0
[ 29.272957] lr : __cpufreq_driver_target+0x138/0x580
...
Fixed by zeroing out pdata before use.
Cc: <stable@vger.kernel.org> # v5.7+
Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
| -rw-r--r-- | drivers/cpufreq/armada-37xx-cpufreq.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/cpufreq/armada-37xx-cpufreq.c b/drivers/cpufreq/armada-37xx-cpufreq.c index aa0f06dec959..df1c941260d1 100644 --- a/drivers/cpufreq/armada-37xx-cpufreq.c +++ b/drivers/cpufreq/armada-37xx-cpufreq.c @@ -456,6 +456,7 @@ static int __init armada37xx_cpufreq_driver_init(void) /* Now that everything is setup, enable the DVFS at hardware level */ armada37xx_cpufreq_enable_dvfs(nb_pm_base); + memset(&pdata, 0, sizeof(pdata)); pdata.suspend = armada37xx_cpufreq_suspend; pdata.resume = armada37xx_cpufreq_resume; |