[PATCH] PM: Fix dev_pm_put_subsys_data() to not call kfree() whileholding device power lock

[Shuah Khan]

dev_pm_put_subsys_data() calls kfree() while holding device power lock, when
the reference count is 0. Fix it to call kfree() after releasing the lock.

Signed-off-by: Shuah Khan <shuah.kh@xxxxxxxxxxx>
---
 drivers/base/power/common.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/base/power/common.c b/drivers/base/power/common.c
index 39c3252..da05fe2 100644
--- a/drivers/base/power/common.c
+++ b/drivers/base/power/common.c
@@ -73,13 +73,17 @@ int dev_pm_put_subsys_data(struct device *dev)
 
 	if (--psd->refcount == 0) {
 		dev->power.subsys_data = NULL;
-		kfree(psd);
 		ret = 1;
 	}
 
  out:
 	spin_unlock_irq(&dev->power.lock);
 
+	if (ret == 1) {
+		/* kfree() verifies that its argument is nonzero. */
+		kfree(psd);
+	}
+
 	return ret;
 }
 EXPORT_SYMBOL_GPL(dev_pm_put_subsys_data);
-- 
1.7.10.4


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