[PATCH v2 11/18] DRM/KMS/EDID: Allow for multiple Connectors when specifying 'firmware'-EDID Files (v2)

[Egbert Eich]

So far it was only possible to load an EDID for a single connector (unless
no connector was specified at all in which case the same EDID file was used
for all).
This patch extends the EDID loader so that EDID files can be specified for
more than one connector. A semicolon is used to separate the different connector
sections.
The option now looks like this:
   edid_firmware="[<connector_0>:]<edid_file_0>[;<connector_n>:<edid_file_1>]..."

v2: Check for edidname != NULL before entering loop.

Signed-off-by: Egbert Eich <eich at suse.com>
---
 drivers/gpu/drm/drm_edid_load.c |   45 ++++++++++++++++++++++++++------------
 1 files changed, 31 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid_load.c b/drivers/gpu/drm/drm_edid_load.c
index 748f63b..9c15c4a 100644
--- a/drivers/gpu/drm/drm_edid_load.c
+++ b/drivers/gpu/drm/drm_edid_load.c
@@ -226,26 +226,43 @@ struct edid *
 drm_load_edid_firmware(struct drm_connector *connector)
 {
 	char *connector_name = drm_get_connector_name(connector);
-	char *edidname = edid_firmware, *last, *colon;
-	struct edid *edid;
+	char *edidname, *last, *colon;
+	struct edid *edid = NULL;
+	char *next, *mem;
+	bool many = false;
 
-	if (*edidname == '\0')
+	if (*edid_firmware == '\0')
 		return NULL;
 
-	colon = strchr(edidname, ':');
-	if (colon != NULL) {
-		if (strncmp(connector_name, edidname, colon - edidname))
-			return NULL;
-		edidname = colon + 1;
-		if (*edidname == '\0')
-			return NULL;
+	edidname = mem = kstrndup(edid_firmware, PATH_MAX, GFP_KERNEL);
+	while (edidname) {
+		next = strchr(edidname, ';');
+		if (next)
+			*(next++) = '\0';
+		colon = strchr(edidname, ':');
+		if (colon == NULL) {
+			if (next || many)
+				edidname = NULL;
+			break;
+		} else if (!strncmp(connector_name, edidname, colon - edidname)) {
+			edidname = colon + 1;
+			break;
+		}
+		edidname = next;
+		many = true;
+	}
+
+	if (edidname && *edidname != '\0') {
+		last = edidname + strlen(edidname) - 1;
+		if (*last == '\n')
+			*last = '\0';
+
+		if (strlen(edidname) > 0)
+			edid = edid_load(connector, edidname, connector_name);
 	}
 
-	last = edidname + strlen(edidname) - 1;
-	if (*last == '\n')
-		*last = '\0';
+	kfree(mem);
 
-	edid = edid_load(connector, edidname, connector_name);
 	if (IS_ERR_OR_NULL(edid))
 		return NULL;
 
-- 
1.7.7