[PATCH 01/10] drm/fourcc: Add warning for bad bpp

[Tomi Valkeinen]

drm_format_info_bpp() cannot be used for formats which do not have an
integer bits-per-pixel. Handle wrong calls by printing a warning and
returning 0.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/drm_fourcc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
index 193cf8ed7912..e84c4ed6928c 100644
--- a/drivers/gpu/drm/drm_fourcc.c
+++ b/drivers/gpu/drm/drm_fourcc.c
@@ -429,6 +429,13 @@ unsigned int drm_format_info_bpp(const struct drm_format_info *info, int plane)
 	if (!info || plane < 0 || plane >= info->num_planes)
 		return 0;
 
+	if (info->char_per_block[plane] * 8 %
+	    (drm_format_info_block_width(info, plane) *
+	     drm_format_info_block_height(info, plane))) {
+		pr_warn("unable to return an integer bpp\n");
+		return 0;
+	}
+
 	return info->char_per_block[plane] * 8 /
 	       (drm_format_info_block_width(info, plane) *
 		drm_format_info_block_height(info, plane));

-- 
2.43.0