[PATCH 4.17 26/46] drm/atmel-hlcdc: check stride values in the first plane

[Greg Kroah-Hartman]

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

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

From: Stefan Agner <stefan@xxxxxxxx>

commit 9fcf2b3c1c0276650fea537c71b513d27d929b05 upstream.

The statement always evaluates to true since the struct fields
are arrays. This has shown up as a warning when compiling with
clang:
  warning: address of array 'desc->layout.xstride' will always
      evaluate to 'true' [-Wpointer-bool-conversion]

Check for values in the first plane instead.

Fixes: 1a396789f65a ("drm: add Atmel HLCDC Display Controller support")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Stefan Agner <stefan@xxxxxxxx>
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20180617084826.31885-1-stefan@xxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
@@ -875,7 +875,7 @@ static int atmel_hlcdc_plane_init_proper
 		drm_object_attach_property(&plane->base.base,
 					   props->alpha, 255);
 
-	if (desc->layout.xstride && desc->layout.pstride) {
+	if (desc->layout.xstride[0] && desc->layout.pstride[0]) {
 		int ret;
 
 		ret = drm_plane_create_rotation_property(&plane->base,