[ 3.5.y.z extended stable ] Patch "hwspinlock: fix __hwspin_lock_request error path" has been added to staging queue

Luis Henriques luis.henriques at canonical.com
Thu Apr 11 09:09:18 UTC 2013

This is a note to let you know that I have just added a patch titled

    hwspinlock: fix __hwspin_lock_request error path

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



>From e44cfdb04c670a5ad00fd6781f2073c48d3e724b Mon Sep 17 00:00:00 2001
From: Li Fei <fei.li at intel.com>
Date: Fri, 5 Apr 2013 21:20:36 +0800
Subject: [PATCH] hwspinlock: fix __hwspin_lock_request error path

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 at intel.com>
Signed-off-by: Li Fei <fei.li at intel.com>
[edit commit log]
Signed-off-by: Ohad Ben-Cohen <ohad at wizery.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.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;


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