[PATCH v2] [ARM] fix reference leak in locomo_init_one_child()

[Ma Ke <make24@iscas.ac.cn>]

Once device_register() failed, we should call put_device() to
decrement reference count for cleanup. Or it could cause memory leak.

device_register() includes device_add(). As comment of device_add()
says, 'if device_add() succeeds, you should call device_del() when you
want to get rid of it. If device_add() has not succeeded, use only
put_device() to drop the reference count'.

Found by code review.

Cc: stable@vger.kernel.org
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
---
Changes in v2:
- modified the patch as suggestions.
---
 arch/arm/common/locomo.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/common/locomo.c b/arch/arm/common/locomo.c
index 309b74783468..9e48cbb2568e 100644
--- a/arch/arm/common/locomo.c
+++ b/arch/arm/common/locomo.c
@@ -253,6 +253,8 @@ locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
 
 	ret = device_register(&dev->dev);
 	if (ret) {
+		put_device(&dev->dev);
+		return ret;
  out:
 		kfree(dev);
 	}
-- 
2.25.1