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
