linux-kernel - [PATCH 2/6] gpio: 104-idi-48e: Mask the read inputs for get

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Message-Id: <7f7c7bb8dc10bb315ca03860cc24230bfc5370d8.1540209293.git.vilhelm.gray@gmail.com>
Date:   Mon, 22 Oct 2018 21:09:16 +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 2/6] gpio: 104-idi-48e: Mask the 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-104-idi-48.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-104-idi-48.c b/drivers/gpio/gpio-104-idi-48.c
index 2c9738adb3a6..88dc6f2449f6 100644
--- a/drivers/gpio/gpio-104-idi-48.c
+++ b/drivers/gpio/gpio-104-idi-48.c
@@ -128,7 +128,7 @@ static int idi_48_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
 		port_state = inb(idi48gpio->base + ports[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