drm/displayid: Iterate over all DisplayID blocks

This will iterate over all DisplayID blocks found in the buffer.
Previously only the first block was parsed.

https://bugs.freedesktop.org/show_bug.cgi?id=95207Signed-off-by: Tomas Bzatek <tomas@bzatek.net>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_edid.c

@@ -4237,8 +4237,13 @@ static int drm_parse_display_id(struct drm_connector *connector,
 		return -EINVAL;
 	}
 
-	block = (struct displayid_block *)&displayid[idx + 4];
-	DRM_DEBUG_KMS("block id %d, rev %d, len %d\n",
+	idx += sizeof(struct displayid_hdr);
+	while (block = (struct displayid_block *)&displayid[idx],
+	       idx + sizeof(struct displayid_block) <= length &&
+	       idx + sizeof(struct displayid_block) + block->num_bytes <= length &&
+	       block->num_bytes > 0) {
+		idx += block->num_bytes + sizeof(struct displayid_block);
+		DRM_DEBUG_KMS("block id 0x%x, rev %d, len %d\n",
 			      block->tag, block->rev, block->num_bytes);
 
 		switch (block->tag) {
@@ -4248,9 +4253,10 @@ static int drm_parse_display_id(struct drm_connector *connector,
 				return ret;
 			break;
 		default:
-		printk("unknown displayid tag %d\n", block->tag);
+			DRM_DEBUG_KMS("found DisplayID tag 0x%x, unhandled\n", block->tag);
 			break;
 		}
+	}
 	return 0;
 }