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authorIvan Kokshaysky <ink@jurassic.park.msu.ru>2020-06-20 17:44:49 +0100
committerViresh Kumar <viresh.kumar@linaro.org>2020-07-30 10:57:45 +0530
commit10470dec3decaf5ed3c596f85debd7c42777ae12 (patch)
tree068d2a864861570e1c1c421c56f90480598ef643 /drivers/cpufreq/armada-37xx-cpufreq.c
parentd48461b2c7c39c89dec598e6ea6e188fdaf418e7 (diff)
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>
Diffstat (limited to 'drivers/cpufreq/armada-37xx-cpufreq.c')
-rw-r--r--drivers/cpufreq/armada-37xx-cpufreq.c1
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;