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Date: Mon, 15 Feb 2016 11:34:53 -0800 From: Guenter Roeck <linux@...ck-us.net> To: Viresh Kumar <vireshk@...nel.org> Cc: Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...eaurora.org>, "Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>, Viresh Kumar <viresh.kumar@...aro.org> Subject: [PATCH -next] PM / OPP: Fix crash seen if CPU clock has no voltage regulator omap3 overo boots crash with Unable to handle kernel NULL pointer dereference at virtual address 00000030 pgd = c0204000 [00000030] *pgd=00000000 Internal error: Oops: 17 [#1] SMP ARM ... [] (regulator_set_voltage) from [] (_set_opp_voltage+0x34/0x90) [] (_set_opp_voltage) from [] (dev_pm_opp_set_rate+0x19c/0x288) [] (dev_pm_opp_set_rate) from [] (__cpufreq_driver_target+0x17c/0x29c) [] (__cpufreq_driver_target) from [] (dbs_check_cpu+0x19c/0x1e4) [] (dbs_check_cpu) from [] (cpufreq_governor_dbs+0x308/0x5c4) [] (cpufreq_governor_dbs) from [] (__cpufreq_governor+0x20c/0x24c) [] (__cpufreq_governor) from [] (cpufreq_init_policy+0x60/0x8c) [] (cpufreq_init_policy) from [] (cpufreq_online+0x2cc/0x6d8) [] (cpufreq_online) from [] (subsys_interface_register+0x80/0xc4) [] (subsys_interface_register) from [] (cpufreq_register_driver+0x144/0x1a0) [] (cpufreq_register_driver) from [] (dt_cpufreq_probe+0x64/0xe8) [] (dt_cpufreq_probe) from [] (platform_drv_probe+0x50/0xb0) [] (platform_drv_probe) from [] (driver_probe_device+0x1f4/0x2b0) ... Analysis shows that regulator==NULL in regulator_set_voltage(). Code around _set_opp_voltage() suggests that having no voltage regulator attached to a CPU clock is valid, so do not attempt to set a voltage in that case. Fixes: 6a0712f6f199e ("PM / OPP: Add dev_pm_opp_set_rate()" Cc: Viresh Kumar <viresh.kumar@...aro.org> Signed-off-by: Guenter Roeck <linux@...ck-us.net> --- drivers/base/power/opp/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index d7cd4e265766..82ad5ae72427 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -564,7 +564,7 @@ static int _set_opp_voltage(struct device *dev, struct regulator *reg, int ret; /* Regulator not available for device */ - if (IS_ERR(reg)) { + if (IS_ERR_OR_NULL(reg)) { dev_dbg(dev, "%s: regulator not available: %ld\n", __func__, PTR_ERR(reg)); return 0; -- 2.5.0
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