linux-kernel - [ 56/85] pinctrl: remove mutex lock in groups show

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Date:	Thu, 25 Oct 2012 17:06:14 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: [ 56/85] pinctrl: remove mutex lock in groups show

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

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

From: Haojian Zhuang <haojian.zhuang@...il.com>

commit 7ae9d71e8df27a3ab60a05ae3add08728debc09c upstream.

Mutex is locked duplicatly by pinconf_groups_show() and
pin_config_group_get(). It results dead lock. So avoid to lock mutex
in pinconf_groups_show().

Signed-off-by: Haojian Zhuang <haojian.zhuang@...il.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pinctrl/pinconf.c |    4 ----
 1 file changed, 4 deletions(-)

--- a/drivers/pinctrl/pinconf.c
+++ b/drivers/pinctrl/pinconf.c
@@ -537,8 +537,6 @@ static int pinconf_groups_show(struct se
 	seq_puts(s, "Pin config settings per pin group\n");
 	seq_puts(s, "Format: group (name): configs\n");
 
-	mutex_lock(&pinctrl_mutex);
-
 	while (selector < ngroups) {
 		const char *gname = pctlops->get_group_name(pctldev, selector);
 
@@ -549,8 +547,6 @@ static int pinconf_groups_show(struct se
 		selector++;
 	}
 
-	mutex_unlock(&pinctrl_mutex);
-
 	return 0;
 }
 


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