From: Mathias Nyman <mathias.nyman@linux.intel.com>
Date: Thu, 25 Oct 2012 11:03:03 +0000 (+0300)
Subject: gpiolib: Don't return -EPROBE_DEFER to sysfs, or for invalid gpios
X-Git-Tag: v3.6.6~21
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4b4717878e2e70626855d5a6b4639a8e37599acc;p=karo-tx-linux.git

gpiolib: Don't return -EPROBE_DEFER to sysfs, or for invalid gpios

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@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index de0213c9d11c..f03ae68051d6 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -623,9 +623,11 @@ static ssize_t export_store(struct class *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 char *label)
 
 	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)