target/linux/brcm2708/patches-4.14/950-0201-drm-panel-rpi-touchscreen-propagate-errors-in-rpi_to.patch

   1 From 5659b5b9d46a236f53217e6686209863960442e3 Mon Sep 17 00:00:00 2001
   2 From: Dan Carpenter <dan.carpenter@oracle.com>
   3 Date: Fri, 20 Oct 2017 03:28:45 +0300
   4 Subject: [PATCH 201/454] drm/panel: rpi-touchscreen: propagate errors in
   5  rpi_touchscreen_i2c_read()
   6
   7 There is one caller which checks whether rpi_touchscreen_i2c_read()
   8 returns negative error codes.  Currently it can't because negative
   9 error codes are truncated to u8, but that's easy to fix if we change the
  10 type to int.
  11
  12 Fixes: 2f733d6194bd ("drm/panel: Add support for the Raspberry Pi 7" Touchscreen.")
  13 Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
  14 Signed-off-by: Eric Anholt <eric@anholt.net>
  15 Link: https://patchwork.freedesktop.org/patch/msgid/20171020002845.kar2wg7gqxg7tzqi@mwanda
  16 Reviewed-by: Eric Anholt <eric@anholt.net>
  17 (cherry picked from commit 85b4587f8e94143bafb8b6a4003a5187b9a8753d)
  18 ---
  19  drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c | 2 +-
  20  1 file changed, 1 insertion(+), 1 deletion(-)
  21
  22 --- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
  23 +++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
  24 @@ -243,7 +243,7 @@ static struct rpi_touchscreen *panel_to_
  25         return container_of(panel, struct rpi_touchscreen, base);
  26  }
  27
  28 -static u8 rpi_touchscreen_i2c_read(struct rpi_touchscreen *ts, u8 reg)
  29 +static int rpi_touchscreen_i2c_read(struct rpi_touchscreen *ts, u8 reg)
  30  {
  31         return i2c_smbus_read_byte_data(ts->bridge_i2c, reg);
  32  }