From dc39d06fcd7a4a82d72eae7b71e94e888b96d29e Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Thu, 1 Dec 2016 16:28:16 +0530 Subject: [PATCH] PM / OPP: Don't use OPP structure outside of rcu protected section The OPP structure must not be used out of the rcu protected section. Cache the values to be used in separate variables instead. Cc: 4.6+ # 4.6+ Signed-off-by: Viresh Kumar Reviewed-by: Stephen Boyd Tested-by: Dave Gerlach Signed-off-by: Rafael J. Wysocki --- drivers/base/power/opp/core.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index 2824d3a5e9f0..6441dfda489f 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -584,6 +584,7 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) struct clk *clk; unsigned long freq, old_freq; unsigned long u_volt, u_volt_min, u_volt_max; + unsigned long old_u_volt, old_u_volt_min, old_u_volt_max; int ret; if (unlikely(!target_freq)) { @@ -633,6 +634,14 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) return ret; } + if (IS_ERR(old_opp)) { + old_u_volt = 0; + } else { + old_u_volt = old_opp->u_volt; + old_u_volt_min = old_opp->u_volt_min; + old_u_volt_max = old_opp->u_volt_max; + } + u_volt = opp->u_volt; u_volt_min = opp->u_volt_min; u_volt_max = opp->u_volt_max; @@ -677,9 +686,10 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) __func__, old_freq); restore_voltage: /* This shouldn't harm even if the voltages weren't updated earlier */ - if (!IS_ERR(old_opp)) - _set_opp_voltage(dev, reg, old_opp->u_volt, - old_opp->u_volt_min, old_opp->u_volt_max); + if (old_u_volt) { + _set_opp_voltage(dev, reg, old_u_volt, old_u_volt_min, + old_u_volt_max); + } return ret; } -- 2.45.2