linux-kernel - [PATCH 2/2] pinctrl: core: Hold pctldev->mutex mutex lock while traversing gpio

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Date:	Sun, 18 Aug 2013 20:40:29 +0800
From:	Axel Lin <axel.lin@...ics.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Haojian Zhuang <haojian.zhuang@...aro.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] pinctrl: core: Hold pctldev->mutex mutex lock while
 traversing gpio_ranges list

Hold pctldev->mutex mutex_lock when traverse the list.

Signed-off-by: Axel Lin <axel.lin@...ics.com>
---
 drivers/pinctrl/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index c670527..4adef2f 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -357,14 +357,17 @@ static bool pinctrl_ready_for_gpio_range(unsigned gpio)
 	/* Loop over the pin controllers */
 	list_for_each_entry(pctldev, &pinctrldev_list, node) {
 		/* Loop over the ranges */
+		mutex_lock(&pctldev->mutex);
 		list_for_each_entry(range, &pctldev->gpio_ranges, node) {
 			/* Check if any gpio range overlapped with gpio chip */
 			if (range->base + range->npins - 1 < chip->base ||
 			    range->base > chip->base + chip->ngpio - 1)
 				continue;
+			mutex_unlock(&pctldev->mutex);
 			mutex_unlock(&pinctrldev_list_mutex);
 			return true;
 		}
+		mutex_unlock(&pctldev->mutex);
 	}
 
 	mutex_unlock(&pinctrldev_list_mutex);
-- 
1.8.1.2



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