[RFC 15/19] drm/edid: restore some type safety to cea_db_*() functions

[Jani Nikula <jani.nikula@xxxxxxxxx>]

During the transition, we accepted a void pointer for a poor C
programmer's version of polymorphism. Switch the functions to use struct
cea_db * to regain some more type safety.

Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
 drivers/gpu/drm/drm_edid.c | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 0400c4024de7..b3aedeefed82 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4244,11 +4244,8 @@ struct cea_db {
 	u8 data[];
 } __packed;
 
-static int cea_db_tag(const void *_db)
+static int cea_db_tag(const struct cea_db *db)
 {
-	/* FIXME: Transition to passing struct cea_db * everywhere. */
-	const struct cea_db *db = _db;
-
 	return db->tag_length >> 5;
 }
 
@@ -4411,41 +4408,41 @@ static void cea_db_iter_end(struct cea_db_iter *iter)
 	memset(iter, 0, sizeof(*iter));
 }
 
-static bool cea_db_is_hdmi_vsdb(const void *db)
+static bool cea_db_is_hdmi_vsdb(const struct cea_db *db)
 {
 	return (cea_db_is_vendor(db, HDMI_IEEE_OUI) &&
 		cea_db_payload_len(db) >= 5);
 }
 
-static bool cea_db_is_hdmi_forum_vsdb(const void *db)
+static bool cea_db_is_hdmi_forum_vsdb(const struct cea_db *db)
 {
 	return (cea_db_is_vendor(db, HDMI_FORUM_IEEE_OUI) &&
 		cea_db_payload_len(db) >= 7);
 }
 
-static bool cea_db_is_microsoft_vsdb(const void *db)
+static bool cea_db_is_microsoft_vsdb(const struct cea_db *db)
 {
 	return (cea_db_is_vendor(db, MICROSOFT_IEEE_OUI) &&
 		cea_db_payload_len(db) == 21);
 }
 
-static bool cea_db_is_vcdb(const void *db)
+static bool cea_db_is_vcdb(const struct cea_db *db)
 {
 	return (cea_db_is_extended_tag(db, CEA_EXT_DB_VIDEO_CAP) &&
 		cea_db_payload_len(db) == 2);
 }
 
-static bool cea_db_is_y420cmdb(const void *db)
+static bool cea_db_is_y420cmdb(const struct cea_db *db)
 {
 	return cea_db_is_extended_tag(db, CEA_EXT_DB_420_VIDEO_CAP_MAP);
 }
 
-static bool cea_db_is_y420vdb(const void *db)
+static bool cea_db_is_y420vdb(const struct cea_db *db)
 {
 	return cea_db_is_extended_tag(db, CEA_EXT_DB_420_VIDEO_DATA);
 }
 
-static bool cea_db_is_hdmi_hdr_metadata_block(const void *db)
+static bool cea_db_is_hdmi_hdr_metadata_block(const struct cea_db *db)
 {
 	return (cea_db_is_extended_tag(db, CEA_EXT_DB_HDR_STATIC_METADATA) &&
 		cea_db_payload_len(db) >= 3);
-- 
2.30.2