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gpio: pca953x: Fix corruption of other gpios in set_multiple.

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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: b4818afeac ("gpio: pca953x: Add set_multiple to allow multiple")
Signed-off-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Phil Reid 2016-11-08 14:00:45 +08:00 committed by Linus Walleij
parent bc33b0ca11
commit 53f8d32223
1 changed files with 1 additions and 0 deletions
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1
drivers/gpio/gpio-pca953x.c
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@ -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;
}
}