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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>
This commit is contained in:
Mike Frysinger 2011-04-12 03:02:11 -04:00
parent f93c25966f
commit 6801201ee7
1 changed files with 4 additions and 1 deletions
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5
common/cmd_gpio.c
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@ -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) {