linux-kernel - [PATCH 6/6] gpio: pcie-idio-24: Mask read inputs for get

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Message-Id: <820f8297d25932ba9dad2dfb50ceee3f803f83cc.1540209293.git.vilhelm.gray@gmail.com>
Date:   Mon, 22 Oct 2018 21:10:20 +0900
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     linus.walleij@...aro.org
Cc:     linux@...musvillemoes.dk, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        William Breathitt Gray <vilhelm.gray@...il.com>
Subject: [PATCH 6/6] gpio: pcie-idio-24: Mask read inputs for get_multiple

This patch masks the read inputs with the word mask in order to ensure
only requested input states are returned in the bits array.

Suggested-by: Rasmus Villemoes <linux@...musvillemoes.dk>
Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
---
 drivers/gpio/gpio-pcie-idio-24.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-pcie-idio-24.c b/drivers/gpio/gpio-pcie-idio-24.c
index f953541e7890..52f1647a46fd 100644
--- a/drivers/gpio/gpio-pcie-idio-24.c
+++ b/drivers/gpio/gpio-pcie-idio-24.c
@@ -243,7 +243,7 @@ static int idio_24_gpio_get_multiple(struct gpio_chip *chip,
 			port_state = ioread8(&idio24gpio->reg->ttl_in0_7);
 
 		/* store acquired bits at respective bits array offset */
-		bits[word_index] |= port_state << word_offset;
+		bits[word_index] |= (port_state << word_offset) & word_mask;
 	}
 
 	return 0;
-- 
2.19.1