linux-kernel - [patch] pinctrl: baytrail: fix some error handling in debugfs

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Date:	Wed, 27 Apr 2016 11:08:35 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Cristina Ciocan <cristina.ciocan@...el.com>
Cc:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] pinctrl: baytrail: fix some error handling in debugfs

We need to unlock before continuing.  Also the continue was accidentally
left out on one error path which would lead to a NULL dereference.

Fixes: 86e3ef812fe3 ('pinctrl: baytrail: Update gpio chip operations')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/pinctrl/intel/pinctrl-baytrail.c b/drivers/pinctrl/intel/pinctrl-baytrail.c
index 6dcf43a..55182fc 100644
--- a/drivers/pinctrl/intel/pinctrl-baytrail.c
+++ b/drivers/pinctrl/intel/pinctrl-baytrail.c
@@ -1390,6 +1390,7 @@ static void byt_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 			seq_printf(s,
 				   "Could not retrieve pin %i conf0 reg\n",
 				   pin);
+			raw_spin_unlock_irqrestore(&vg->lock, flags);
 			continue;
 		}
 		conf0 = readl(reg);
@@ -1398,6 +1399,8 @@ static void byt_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 		if (!reg) {
 			seq_printf(s,
 				   "Could not retrieve pin %i val reg\n", pin);
+			raw_spin_unlock_irqrestore(&vg->lock, flags);
+			continue;
 		}
 		val = readl(reg);
 		raw_spin_unlock_irqrestore(&vg->lock, flags);