[PATCH] regulator: core: Move regulator release to avoid deadlock

[Charles Keepax]

regulator_put function was called whilst holding the
regulator_list_mutex, which is also locked from regulator_put. This
causes deadlock when failing to register a regulator.

This patch adds a second exit point for the regulator_register function
which releases the mutex and then cleans up the supply.

Signed-off-by: Charles Keepax <ckee...@opensource.wolfsonmicro.com>
---
 drivers/regulator/core.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 5c4829c..e68754c 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3444,15 +3444,18 @@ unset_supplies:
        unset_regulator_supplies(rdev);
 
 scrub:
-       if (rdev->supply)
-               regulator_put(rdev->supply);
        if (rdev->ena_gpio)
                gpio_free(rdev->ena_gpio);
        kfree(rdev->constraints);
        device_unregister(&rdev->dev);
+
+       mutex_unlock(&regulator_list_mutex);
+       if (rdev->supply)
+               regulator_put(rdev->supply);
+
        /* device core frees rdev */
        rdev = ERR_PTR(ret);
-       goto out;
+       return rdev;
 
 clean:
        kfree(rdev);
-- 
1.7.2.5

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