linux-kernel - [ 04/24] gpiolib: Dont return -EPROBE_DEFER to sysfs, or for invalid gpios

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Message-Id: <20121102170247.744136705@linuxfoundation.org>
Date:	Fri,  2 Nov 2012 10:06:52 -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,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: [ 04/24] gpiolib: Dont return -EPROBE_DEFER to sysfs, or for invalid gpios

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

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

From: Mathias Nyman <mathias.nyman@...ux.intel.com>

commit ad2fab36d7922401c4576fb7ea9b21a47a29a17f upstream.

gpios requested with invalid numbers, or gpios requested from userspace via sysfs
should not try to be deferred on failure.

Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpio/gpiolib.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -623,9 +623,11 @@ static ssize_t export_store(struct class
 	 */
 
 	status = gpio_request(gpio, "sysfs");
-	if (status < 0)
+	if (status < 0) {
+		if (status == -EPROBE_DEFER)
+			status = -ENODEV;
 		goto done;
-
+	}
 	status = gpio_export(gpio, true);
 	if (status < 0)
 		gpio_free(gpio);
@@ -1191,8 +1193,10 @@ int gpio_request(unsigned gpio, const ch
 
 	spin_lock_irqsave(&gpio_lock, flags);
 
-	if (!gpio_is_valid(gpio))
+	if (!gpio_is_valid(gpio)) {
+		status = -EINVAL;
 		goto done;
+	}
 	desc = &gpio_desc[gpio];
 	chip = desc->chip;
 	if (chip == NULL)


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