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Subject[PATCH 2/2] PM / QoS: Use lockdep asserts to find missing hold of power.lock
Date
Add lockdep asserts for holding the dev->power.lock to non-static
functions which require this. They could be used outside of the file so
asserts may help in detecting locking misuse.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
---
drivers/base/power/qos.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c
index a8fe4c1a8d07..e56d538d039e 100644
--- a/drivers/base/power/qos.c
+++ b/drivers/base/power/qos.c
@@ -64,6 +64,8 @@ enum pm_qos_flags_status __dev_pm_qos_flags(struct device *dev, s32 mask)
struct pm_qos_flags *pqf;
s32 val;

+ lockdep_assert_held(&dev->power.lock);
+
if (IS_ERR_OR_NULL(qos))
return PM_QOS_FLAGS_UNDEFINED;

@@ -104,6 +106,8 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_flags);
*/
s32 __dev_pm_qos_read_value(struct device *dev)
{
+ lockdep_assert_held(&dev->power.lock);
+
return IS_ERR_OR_NULL(dev->power.qos) ?
0 : pm_qos_read_value(&dev->power.qos->resume_latency);
}
--
1.9.1


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