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authorAlexandre Courbot <acourbot@nvidia.com>2013-10-04 10:59:58 -0700
committerLinus Walleij <linus.walleij@linaro.org>2013-10-11 16:31:54 +0200
commit0204df470d6db830f0f2f5654ec582be84d81588 (patch)
tree22bbd2debb7534f143143e6648a2acd4911306dd
parent8c0fca8153224822121c85a64d6401903b9e4690 (diff)
gpiolib: let gpiod_request() return -EPROBE_DEFERgpio-v3.12-3
Patch be1a4b brought some improvements to the GPIO error handling code, but also changed the return value of gpiod_request() when called on a not yet initialized GPIO descriptor: it now returns -EINVAL instead of -EPROBE_DEFER, and this affects some drivers. This patch restores the original behavior for gpiod_request(). It is safe to do so now that desc_to_gpio() does not rely on the GPIO descriptor to be initialized. Other functions changed by patch be1a4b do not see their return value affected, so these are not reverted. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Reported-by: Dr. H. Nikolaus Schaller <hns@goldelico.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
-rw-r--r--drivers/gpio/gpiolib.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index f330631..0dee0e0 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1398,7 +1398,7 @@ static int gpiod_request(struct gpio_desc *desc, const char *label)
int status = -EPROBE_DEFER;
unsigned long flags;
- if (!desc || !desc->chip) {
+ if (!desc) {
pr_warn("%s: invalid GPIO\n", __func__);
return -EINVAL;
}
@@ -1406,6 +1406,8 @@ static int gpiod_request(struct gpio_desc *desc, const char *label)
spin_lock_irqsave(&gpio_lock, flags);
chip = desc->chip;
+ if (chip == NULL)
+ goto done;
if (!try_module_get(chip->owner))
goto done;