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authorLinus Walleij <linus.walleij@linaro.org>2016-05-30 16:48:39 +0200
committerLinus Walleij <linus.walleij@linaro.org>2016-05-30 16:56:41 +0200
commit54d77198fdfbc4f0fe11b4252c1d9c97d51a3264 (patch)
tree0a8327b8bdf5c49781c8efad73009e4f0bb77719 /drivers/gpio/gpiolib.c
parent8b92e17efe029cc19f435f9fcbdfb1e7b9beb0ef (diff)
gpio: bail out silently on NULL descriptors
In fdeb8e1547cb9dd39d5d7223b33f3565cf86c28e ("gpio: reflect base and ngpio into gpio_device") assumed that GPIO descriptors are either valid or error pointers, but gpiod_get_[index_]optional() actually return NULL descriptors and then all subsequent calls should just bail out. Cc: stable@vger.kernel.org Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Andrew Lunn <andrew@lunn.ch> Fixes: fdeb8e1547cb ("gpio: reflect base and ngpio into gpio_device") Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpiolib.c')
-rw-r--r--drivers/gpio/gpiolib.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 68dbff5d8f57..246b6b051b0d 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1367,10 +1367,13 @@ done:
/*
* This descriptor validation needs to be inserted verbatim into each
* function taking a descriptor, so we need to use a preprocessor
- * macro to avoid endless duplication.
+ * macro to avoid endless duplication. If the desc is NULL it is an
+ * optional GPIO and calls should just bail out.
*/
#define VALIDATE_DESC(desc) do { \
- if (!desc || !desc->gdev) { \
+ if (!desc) \
+ return 0; \
+ if (!desc->gdev) { \
pr_warn("%s: invalid GPIO\n", __func__); \
return -EINVAL; \
} \
@@ -1381,7 +1384,9 @@ done:
} } while (0)
#define VALIDATE_DESC_VOID(desc) do { \
- if (!desc || !desc->gdev) { \
+ if (!desc) \
+ return; \
+ if (!desc->gdev) { \
pr_warn("%s: invalid GPIO\n", __func__); \
return; \
} \