diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index 05baf772..09ff41a 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -17,7 +17,6 @@
 #include <linux/slab.h>
 #include <linux/nls.h>
 #include <linux/ctype.h>
-#include <linux/smp_lock.h>
 #include <linux/statfs.h>
 #include <linux/cdrom.h>
 #include <linux/parser.h>
@@ -44,11 +43,7 @@
 	struct isofs_sb_info *sbi = ISOFS_SB(sb);
 
 #ifdef CONFIG_JOLIET
-	lock_kernel();
-
 	unload_nls(sbi->s_nls_iocharset);
-
-	unlock_kernel();
 #endif
 
 	kfree(sbi);
@@ -571,15 +566,11 @@
 	int table, error = -EINVAL;
 	unsigned int vol_desc_start;
 
-	lock_kernel();
-
 	save_mount_options(s, data);
 
 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
-	if (!sbi) {
-		unlock_kernel();
+	if (!sbi)
 		return -ENOMEM;
-	}
 	s->s_fs_info = sbi;
 
 	if (!parse_options((char *)data, &opt))
@@ -827,6 +818,7 @@
 	sbi->s_utf8 = opt.utf8;
 	sbi->s_nocompress = opt.nocompress;
 	sbi->s_overriderockperm = opt.overriderockperm;
+	mutex_init(&sbi->s_mutex);
 	/*
 	 * It would be incredibly stupid to allow people to mark every file
 	 * on the disk as suid, so we merely allow them to set the default
@@ -904,7 +896,6 @@
 
 	kfree(opt.iocharset);
 
-	unlock_kernel();
 	return 0;
 
 	/*
@@ -944,7 +935,6 @@
 	kfree(opt.iocharset);
 	kfree(sbi);
 	s->s_fs_info = NULL;
-	unlock_kernel();
 	return error;
 }
 
@@ -983,8 +973,6 @@
 	int section, rv, error;
 	struct iso_inode_info *ei = ISOFS_I(inode);
 
-	lock_kernel();
-
 	error = -EIO;
 	rv = 0;
 	if (iblock < 0 || iblock != iblock_s) {
@@ -1060,7 +1048,6 @@
 
 	error = 0;
 abort:
-	unlock_kernel();
 	return rv != 0 ? rv : error;
 }