linux-kernel - [PATCH 18/72] hwspinlock: fix __hwspin_lock

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Message-Id: <1366276617-3553-19-git-send-email-luis.henriques@canonical.com>
Date:	Thu, 18 Apr 2013 10:16:03 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Li Fei <fei.li@...el.com>, Ohad Ben-Cohen <ohad@...ery.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 18/72] hwspinlock: fix __hwspin_lock_request error path

3.5.7.11 -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: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/hwspinlock/hwspinlock_core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hwspinlock/hwspinlock_core.c b/drivers/hwspinlock/hwspinlock_core.c
index 1201a15..08e7e72 100644
--- a/drivers/hwspinlock/hwspinlock_core.c
+++ b/drivers/hwspinlock/hwspinlock_core.c
@@ -416,6 +416,8 @@ static int __hwspin_lock_request(struct hwspinlock *hwlock)
 	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;
 	}
 
-- 
1.8.1.2

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