linux-kernel - [PATCH] call gpio_cansleep only after gpio

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Message-Id: <1202999569-9022-1-git-send-email-Uwe.Kleine-Koenig@digi.com>
Date:	Thu, 14 Feb 2008 15:32:49 +0100
From:	Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
To:	linux-kernel@...r.kernel.org
Cc:	David Brownell <dbrownell@...rs.sourceforge.net>,
	Raphael Assenat <raph@...com>,
	Richard Purdie <rpurdie@...ys.net>
Subject: [PATCH] call gpio_cansleep only after gpio_request succeeded

If you have GPIO_LIB gpio_cansleep oopses on an invalid
gpio.  So better gpio_request your pin first.

Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
Cc: David Brownell <dbrownell@...rs.sourceforge.net>
Cc: Raphael Assenat <raph@...com>
Cc: Richard Purdie <rpurdie@...ys.net>
---
Hello,

I currently start using GPIO_LIB and don't have any chips yet.  The Oops will
vanish after I will have registered the chips for my SoC's gpios, but still
this way the code is more robust.

Best regards
Uwe

 drivers/leds/leds-gpio.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 6c0a9c4..76ddcf3 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -79,6 +79,10 @@ static int gpio_led_probe(struct platform_device *pdev)
 		cur_led = &pdata->leds[i];
 		led_dat = &leds_data[i];
 
+		ret = gpio_request(led_dat->gpio, cur_led->name);
+		if (ret < 0)
+			goto err;
+
 		led_dat->cdev.name = cur_led->name;
 		led_dat->cdev.default_trigger = cur_led->default_trigger;
 		led_dat->gpio = cur_led->gpio;
@@ -87,10 +91,6 @@ static int gpio_led_probe(struct platform_device *pdev)
 		led_dat->cdev.brightness_set = gpio_led_set;
 		led_dat->cdev.brightness = LED_OFF;
 
-		ret = gpio_request(led_dat->gpio, led_dat->cdev.name);
-		if (ret < 0)
-			goto err;
-
 		gpio_direction_output(led_dat->gpio, led_dat->active_low);
 
 		INIT_WORK(&led_dat->work, gpio_led_work);
-- 
1.5.4.1

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