diff mbox

[V7,03/10] PM / OPP: Don't use OPP structure outside of rcu protected section

Message ID 8c81920230d36d7be918296aadc06d6aec1113d0.1480564564.git.viresh.kumar@linaro.org
State New
Headers show

Commit Message

Viresh Kumar Dec. 1, 2016, 10:58 a.m. UTC 
The OPP structure must not be used out of the rcu protected section.
Cache the values to be used in separate variables instead.

Cc:  # v4.6+ <stable@vger.kernel.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>

Tested-by: Dave Gerlach <d-gerlach@ti.com>

---
 drivers/base/power/opp/core.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

-- 
2.7.1.410.g6faf27b

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diff mbox

Patch

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;
 }