linux-kernel - [12/35] watchdog: mtx1-wdt: request gpio before using it

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Date:	Fri, 08 Jul 2011 16:00:28 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Florian Fainelli <florian@...nwrt.org>,
	Wim Van Sebroeck <wim@...ana.be>
Subject: [12/35] watchdog: mtx1-wdt: request gpio before using it

2.6.33-longterm review patch.  If anyone has any objections, please let us know.

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

From: Florian Fainelli <florian@...nwrt.org>

commit 9b19d40aa3ebaf1078779da10555da2ab8512422 upstream.

Otherwise, the gpiolib autorequest feature will produce a WARN_ON():

WARNING: at drivers/gpio/gpiolib.c:101 0x8020ec6c()
autorequest GPIO-215
[...]

Signed-off-by: Florian Fainelli <florian@...nwrt.org>
Signed-off-by: Wim Van Sebroeck <wim@...ana.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/watchdog/mtx-1_wdt.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/watchdog/mtx-1_wdt.c
+++ b/drivers/watchdog/mtx-1_wdt.c
@@ -211,6 +211,12 @@ static int __devinit mtx1_wdt_probe(stru
 	int ret;
 
 	mtx1_wdt_device.gpio = pdev->resource[0].start;
+	ret = gpio_request_one(mtx1_wdt_device.gpio,
+				GPIOF_OUT_INIT_HIGH, "mtx1-wdt");
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to request gpio");
+		return ret;
+	}
 
 	spin_lock_init(&mtx1_wdt_device.lock);
 	init_completion(&mtx1_wdt_device.stop);
@@ -236,6 +242,8 @@ static int __devexit mtx1_wdt_remove(str
 		mtx1_wdt_device.queue = 0;
 		wait_for_completion(&mtx1_wdt_device.stop);
 	}
+
+	gpio_free(mtx1_wdt_device.gpio);
 	misc_deregister(&mtx1_wdt_misc);
 	return 0;
 }


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