From: Mike Frysinger <vapier@gentoo.org>
Date: Tue, 12 Apr 2011 07:02:11 +0000 (-0400)
Subject: gpio: check request result
X-Git-Tag: v2011.06-rc1~143^2
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=6801201ee72795dddb1e23aa6091c95866b19e0b;p=u-boot

gpio: check request result

Make sure the pin request passed before attempting to use it later on.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---

diff --git a/common/cmd_gpio.c b/common/cmd_gpio.c
index 9c9de28e4a..9cc790aba8 100644
--- a/common/cmd_gpio.c
+++ b/common/cmd_gpio.c
@@ -57,7 +57,10 @@ static int do_gpio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		goto show_usage;
 
 	/* grab the pin before we tweak it */
-	gpio_request(gpio, "cmd_gpio");
+	if (gpio_request(gpio, "cmd_gpio")) {
+		printf("gpio: requesting pin %u failed\n", gpio);
+		return -1;
+	}
 
 	/* finally, let's do it: set direction and exec command */
 	if (sub_cmd == GPIO_INPUT) {