linux-kernel - [PATCH 4/6] gpio: ws16c48: Mask read inputs for get

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Message-Id: <304924e41af041f873abb5c3fe4701d0a870219b.1540209293.git.vilhelm.gray@gmail.com>
Date:   Mon, 22 Oct 2018 21:09:49 +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 4/6] gpio: ws16c48: 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-ws16c48.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-ws16c48.c b/drivers/gpio/gpio-ws16c48.c
index c7028eb0b8e1..5cf3697bfb15 100644
--- a/drivers/gpio/gpio-ws16c48.c
+++ b/drivers/gpio/gpio-ws16c48.c
@@ -169,7 +169,7 @@ static int ws16c48_gpio_get_multiple(struct gpio_chip *chip,
 		port_state = inb(ws16c48gpio->base + i);
 
 		/* 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