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37 lines
1.6 KiB
Diff
37 lines
1.6 KiB
Diff
From f1f172ace5f5cdafbc4fe42b1a6b787f04c4403b Mon Sep 17 00:00:00 2001
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From: Dan Carpenter <dan.carpenter@oracle.com>
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Date: Fri, 20 Oct 2017 03:28:45 +0300
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Subject: [PATCH 220/277] drm/panel: rpi-touchscreen: propagate errors in
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rpi_touchscreen_i2c_read()
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There is one caller which checks whether rpi_touchscreen_i2c_read()
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returns negative error codes. Currently it can't because negative
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error codes are truncated to u8, but that's easy to fix if we change the
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type to int.
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Fixes: 2f733d6194bd ("drm/panel: Add support for the Raspberry Pi 7" Touchscreen.")
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Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
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Signed-off-by: Eric Anholt <eric@anholt.net>
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Link: https://patchwork.freedesktop.org/patch/msgid/20171020002845.kar2wg7gqxg7tzqi@mwanda
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Reviewed-by: Eric Anholt <eric@anholt.net>
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(cherry picked from commit 85b4587f8e94143bafb8b6a4003a5187b9a8753d)
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---
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drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
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index b57b7ad9aa4c..128523d8d518 100644
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--- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
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+++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
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@@ -243,7 +243,7 @@ static struct rpi_touchscreen *panel_to_ts(struct drm_panel *panel)
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return container_of(panel, struct rpi_touchscreen, base);
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}
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-static u8 rpi_touchscreen_i2c_read(struct rpi_touchscreen *ts, u8 reg)
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+static int rpi_touchscreen_i2c_read(struct rpi_touchscreen *ts, u8 reg)
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{
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return i2c_smbus_read_byte_data(ts->bridge_i2c, reg);
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}
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--
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2.16.1
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