staging: xgifb: eliminate string comparison from mode search

Eliminate string comparison from the video mode search.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/xgifb/XGI_main_26.c

@@ -390,18 +390,25 @@ static int XGIfb_GetXG21DefaultLVDSModeIdx(struct xgifb_video_info *xgifb_info)
 static void XGIfb_search_mode(struct xgifb_video_info *xgifb_info,
 			      const char *name)
 {
-	int i = 0, j = 0, l;
+	unsigned int xres;
+	unsigned int yres;
+	unsigned int bpp;
+	int i;
 
-	while (XGIbios_mode[i].mode_no != 0) {
-		l = min(strlen(name), strlen(XGIbios_mode[i].name));
-		if (!strncmp(name, XGIbios_mode[i].name, l)) {
+	if (sscanf(name, "%ux%ux%u", &xres, &yres, &bpp) != 3)
+		goto invalid_mode;
+
+	if (bpp == 24)
+		bpp = 32; /* That's for people who mix up color and fb depth. */
+
+	for (i = 0; XGIbios_mode[i].mode_no != 0; i++)
+		if (XGIbios_mode[i].xres == xres &&
+		    XGIbios_mode[i].yres == yres &&
+		    XGIbios_mode[i].bpp == bpp) {
 			xgifb_info->mode_idx = i;
-			j = 1;
-			break;
-		}
-		i++;
+			return;
 		}
-	if (!j)
+invalid_mode:
 	pr_info("Invalid mode '%s'\n", name);
 }