linux-kernel - [ 19/29] hwspinlock: fix __hwspin_lock

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Date:	Wed, 10 Apr 2013 15:49:37 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Li Fei <fei.li@...el.com>,
	Ohad Ben-Cohen <ohad@...ery.com>
Subject: [ 19/29] hwspinlock: fix __hwspin_lock_request error path

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Li Fei <fei.li@...el.com>

commit c10b90d85a5126d25c89cbaa50dc9fdd1c4d001a upstream.

Even in failed case of pm_runtime_get_sync, the usage_count
is incremented. In order to keep the usage_count with correct
value and runtime power management to behave correctly, call
pm_runtime_put_noidle in such case.

In __hwspin_lock_request, module_put is also called before
return in pm_runtime_get_sync failed case.

Signed-off-by Liu Chuansheng <chuansheng.liu@...el.com>
Signed-off-by: Li Fei <fei.li@...el.com>
[edit commit log]
Signed-off-by: Ohad Ben-Cohen <ohad@...ery.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hwspinlock/hwspinlock_core.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/hwspinlock/hwspinlock_core.c
+++ b/drivers/hwspinlock/hwspinlock_core.c
@@ -416,6 +416,8 @@ static int __hwspin_lock_request(struct
 	ret = pm_runtime_get_sync(dev);
 	if (ret < 0) {
 		dev_err(dev, "%s: can't power on device\n", __func__);
+		pm_runtime_put_noidle(dev);
+		module_put(dev->driver->owner);
 		return ret;
 	}
 


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