4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jon Hunter <jonathanh@xxxxxxxxxx>
commit 8e5356a73604f53da6a1e0756727cb8f9f7bba17 upstream.
During the resolution of a regulator's supply, we may attempt to enable
the supply if the regulator itself is already enabled. If enabling the
supply fails, then we will call _regulator_put() for the supply.
However, the pointer to the supply has not been cleared for the
regulator and this will cause a crash if we then unregister the
regulator and attempt to call regulator_put() a second time for the
supply. Fix this by clearing the supply pointer if enabling the supply
after fails when resolving the supply for a regulator.
Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Cc: Julia Lawall <julia.lawall@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/regulator/core.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1519,6 +1519,7 @@ static int regulator_resolve_supply(stru
ret = regulator_enable(rdev->supply);
if (ret < 0) {
_regulator_put(rdev->supply);
+ rdev->supply = NULL;
return ret;
}
}