4.15-stable review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter dan.carpenter@oracle.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@oracle.com Signed-off-by: Eric Anholt eric@anholt.net Link: https://patchwork.freedesktop.org/patch/msgid/20171020002845.kar2wg7gqxg7tzq... Reviewed-by: Eric Anholt eric@anholt.net Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.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); }