From 53f8d322234649b4d6f1515b20c127a577efd164 Mon Sep 17 00:00:00 2001 From: Phil Reid Date: Tue, 8 Nov 2016 14:00:45 +0800 Subject: gpio: pca953x: Fix corruption of other gpios in set_multiple. gpiod_set_array_value_complex does not clear the bits field. Therefore when the drivers set_multiple funciton is called bits outside the mask are undefined and can be either set or not. So bank_val needs to be masked with bank_mask before or with the reg_val cache. Cc: stable@vger.kernel.org Fixes: b4818afeacbd ("gpio: pca953x: Add set_multiple to allow multiple") Signed-off-by: Phil Reid Signed-off-by: Linus Walleij --- drivers/gpio/gpio-pca953x.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/gpio/gpio-pca953x.c') diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index e422568e14ad..4a8d0fe60e0c 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -380,6 +380,7 @@ static void pca953x_gpio_set_multiple(struct gpio_chip *gc, if (bank_mask) { bank_val = bits[bank / sizeof(*bits)] >> ((bank % sizeof(*bits)) * 8); + bank_val &= bank_mask; reg_val[bank] = (reg_val[bank] & ~bank_mask) | bank_val; } } -- cgit v1.2.3