linux-kernel - [PATCH 4.15 028/128] drm/panel: rpi-touchscreen: propagate errors in rpi_touchscreen_i2c

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Date:   Fri, 16 Mar 2018 16:22:49 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Eric Anholt <eric@...olt.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.15 028/128] drm/panel: rpi-touchscreen: propagate errors in rpi_touchscreen_i2c_read()

4.15-stable review patch.  If anyone has any objections, please let me know.

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

From: Dan Carpenter <dan.carpenter@...cle.com>


[ Upstream commit 85b4587f8e94143bafb8b6a4003a5187b9a8753d ]

There is one caller which checks whether rpi_touchscreen_i2c_read()
returns negative error codes.  Currently it can't because negative
error codes are truncated to u8, but that's easy to fix if we change the
type to int.

Fixes: 2f733d6194bd ("drm/panel: Add support for the Raspberry Pi 7" Touchscreen.")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Eric Anholt <eric@...olt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20171020002845.kar2wg7gqxg7tzqi@mwanda
Reviewed-by: Eric Anholt <eric@...olt.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
index 890fd6ff397c..d964d454e4ae 100644
--- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
+++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
@@ -221,7 +221,7 @@ static struct rpi_touchscreen *panel_to_ts(struct drm_panel *panel)
 	return container_of(panel, struct rpi_touchscreen, base);
 }
 
-static u8 rpi_touchscreen_i2c_read(struct rpi_touchscreen *ts, u8 reg)
+static int rpi_touchscreen_i2c_read(struct rpi_touchscreen *ts, u8 reg)
 {
 	return i2c_smbus_read_byte_data(ts->i2c, reg);
 }
-- 
2.16.2