gpiolib: let gpiod_request() return -EPROBE_DEFER
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>
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@ -1398,7 +1398,7 @@ static int gpiod_request(struct gpio_desc *desc, const char *label)
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int status = -EPROBE_DEFER;
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unsigned long flags;
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if (!desc || !desc->chip) {
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if (!desc) {
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pr_warn("%s: invalid GPIO\n", __func__);
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return -EINVAL;
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}
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@ -1406,6 +1406,8 @@ static int gpiod_request(struct gpio_desc *desc, const char *label)
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spin_lock_irqsave(&gpio_lock, flags);
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chip = desc->chip;
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if (chip == NULL)
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goto done;
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if (!try_module_get(chip->owner))
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goto done;
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