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gpio: check request result
author
Mike Frysinger
<vapier@gentoo.org>
Tue, 12 Apr 2011 07:02:11 +0000
(
03:02
-0400)
committer
Mike Frysinger
<vapier@gentoo.org>
Wed, 13 Apr 2011 19:57:00 +0000
(15:57 -0400)
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
patch
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diff --git
a/common/cmd_gpio.c
b/common/cmd_gpio.c
index
9c9de28
..
9cc790a
100644
(file)
--- 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) {