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gpiolib: Avoid calling chip->request() for unused gpios 

Add a check for unused gpios to avoid chip->request() call to client
driver for unused gpios.

Signed-off-by: Biju Das <biju.das@bp.renesas.com>
Reviewed-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Biju Das 2018-08-07 08:15:18 +01:00 committed by Linus Walleij
parent 21041daba2
commit 3789f5acb9
1 changed files with 6 additions and 1 deletions
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7
drivers/gpio/gpiolib.c
View File

@ -2267,6 +2267,7 @@ static int gpiod_request_commit(struct gpio_desc *desc, const char *label)
struct gpio_chip *chip = desc->gdev->chip;
int status;
unsigned long flags;
unsigned offset;
spin_lock_irqsave(&gpio_lock, flags);
@ -2285,7 +2286,11 @@ static int gpiod_request_commit(struct gpio_desc *desc, const char *label)
if (chip->request) {
/* chip->request may sleep */
spin_unlock_irqrestore(&gpio_lock, flags);
status = chip->request(chip, gpio_chip_hwgpio(desc));
offset = gpio_chip_hwgpio(desc);
if (gpiochip_line_is_valid(chip, offset))
status = chip->request(chip, offset);
else
status = -EINVAL;
spin_lock_irqsave(&gpio_lock, flags);
if (status < 0) {