From 6801201ee72795dddb1e23aa6091c95866b19e0b Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Tue, 12 Apr 2011 03:02:11 -0400
Subject: [PATCH] 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>
---
common/cmd_gpio.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/common/cmd_gpio.c b/common/cmd_gpio.c
index 9c9de28e4a6..9cc790aba8a 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) {
--
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