From 6c6b3db302af35692b8ba84bc751d8284c17b975 Mon Sep 17 00:00:00 2001
From: des <des@FreeBSD.org>
Date: Mon, 17 Nov 2003 11:08:28 +0000
Subject: Instead of blindly loading the ums module and bailing out if that
 fails, check if it's already loaded or compiled into the kernel, and only try
 to load it if it isn't.

PR:		bin/59368
Submitted by:	Jens Rehsack <rehsack@liwing.de>
---
 usr.sbin/moused/moused.c | 40 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 38 insertions(+), 2 deletions(-)

diff --git a/usr.sbin/moused/moused.c b/usr.sbin/moused/moused.c
index e1c848e..b77e82a 100644
--- a/usr.sbin/moused/moused.c
+++ b/usr.sbin/moused/moused.c
@@ -70,6 +70,9 @@ static const char rcsid[] =
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/un.h>
+#include <sys/param.h>
+#include <sys/linker.h>
+#include <sys/module.h>
 #include <unistd.h>
 
 #define MAX_CLICKTHRESHOLD	2000	/* 2 seconds */
@@ -495,6 +498,8 @@ static void	mremote_clientchg(int add);
 
 static int kidspad(u_char rxc, mousestatus_t *act);
 
+static int usbmodule(void);
+
 int
 main(int argc, char *argv[])
 {
@@ -754,8 +759,7 @@ main(int argc, char *argv[])
 
     retry = 1;
     if (strncmp(rodent.portname, "/dev/ums", 8) == 0) {
-	if (kldload("ums") == -1 && errno != EEXIST)
-	    logerr(1, "unable to load USB mouse driver");
+	usbmodule();
 	retry = 5;
     }
 
@@ -826,6 +830,38 @@ main(int argc, char *argv[])
     exit(0);
 }
 
+static int
+usbmodule(void)
+{
+    struct kld_file_stat fstat;
+    struct module_stat mstat;
+    int fileid, modid;
+    int loaded;
+
+    for (loaded = 0, fileid = kldnext(0); !loaded && fileid > 0;
+	 fileid = kldnext(fileid)) {
+	fstat.version = sizeof(fstat);
+	if (kldstat(fileid, &fstat) < 0)
+	    continue;
+	if (strncmp(fstat.name, "uhub/ums", 8) == 0) {
+	    loaded = 1;
+	    break;
+	}
+	for (modid = kldfirstmod(fileid); modid > 0;
+	     modid = modfnext(modid)) {
+	    mstat.version = sizeof(mstat);
+	    if (modstat(modid, &mstat) < 0)
+		continue;
+	    if (strncmp(mstat.name, "uhub/ums", 8) == 0) {
+		loaded = 1;
+		break;
+	    }
+	}
+    }
+    if (!loaded && kldload("ums") == -1 && errno != EEXIST)
+	logerr(1, "unable to load USB mouse driver");
+}
+
 static void
 moused(void)
 {
-- 
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