linux-kernel - [PATCH 3.16 175/217] gpio: pca953x: Use correct u16 value for register word write

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Message-ID: <lsq.1461711741.815883419@decadent.org.uk>
Date:	Wed, 27 Apr 2016 01:02:21 +0200
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Phil Reid" <preid@...ctromag.com.au>,
	"Linus Walleij" <linus.walleij@...aro.org>,
	"Yong Li" <sdliyong@...il.com>
Subject: [PATCH 3.16 175/217] gpio: pca953x: Use correct u16 value for
 register word write

3.16.35-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Yong Li <sdliyong@...il.com>

commit 9b8e3ec34318663affced3c14d960e78d760dd9a upstream.

The current implementation only uses the first byte in val,
the second byte is always 0. Change it to use cpu_to_le16
to write the two bytes into the register

Signed-off-by: Yong Li <sdliyong@...il.com>
Reviewed-by: Phil Reid <preid@...ctromag.com.au>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/gpio/gpio-pca953x.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -18,6 +18,7 @@
 #include <linux/i2c.h>
 #include <linux/platform_data/pca953x.h>
 #include <linux/slab.h>
+#include <asm/unaligned.h>
 #ifdef CONFIG_OF_GPIO
 #include <linux/of_platform.h>
 #endif
@@ -154,7 +155,7 @@ static int pca953x_write_regs(struct pca
 		switch (chip->chip_type) {
 		case PCA953X_TYPE:
 			ret = i2c_smbus_write_word_data(chip->client,
-							reg << 1, (u16) *val);
+			    reg << 1, cpu_to_le16(get_unaligned((u16 *)val)));
 			break;
 		case PCA957X_TYPE:
 			ret = i2c_smbus_write_byte_data(chip->client, reg << 1,