BKL: Remove BKL from squashfs

The BKL is only used in put_super and fill_super, which are both protected
by the superblocks s_umount rw_semaphore. Therefore it is safe to remove
the BKL entirely.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Cc: Phillip Lougher <phillip@lougher.demon.co.uk>

fs/squashfs/super.c

@@ -30,7 +30,6 @@
 #include <linux/fs.h>
 #include <linux/vfs.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
 #include <linux/mutex.h>
 #include <linux/pagemap.h>
 #include <linux/init.h>
@@ -87,14 +86,11 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
 	u64 lookup_table_start, xattr_id_table_start;
 	int err;
 
-	lock_kernel();
-
 	TRACE("Entered squashfs_fill_superblock\n");
 
 	sb->s_fs_info = kzalloc(sizeof(*msblk), GFP_KERNEL);
 	if (sb->s_fs_info == NULL) {
 		ERROR("Failed to allocate squashfs_sb_info\n");
-		unlock_kernel();
 		return -ENOMEM;
 	}
 	msblk = sb->s_fs_info;
@@ -304,7 +300,6 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
 
 	TRACE("Leaving squashfs_fill_super\n");
 	kfree(sblk);
-	unlock_kernel();
 	return 0;
 
 failed_mount:
@@ -319,13 +314,11 @@ static int squashfs_fill_super(struct super_block *sb, void *data, int silent)
 	kfree(sb->s_fs_info);
 	sb->s_fs_info = NULL;
 	kfree(sblk);
-	unlock_kernel();
 	return err;
 
 failure:
 	kfree(sb->s_fs_info);
 	sb->s_fs_info = NULL;
-	unlock_kernel();
 	return -ENOMEM;
 }
 
@@ -360,8 +353,6 @@ static int squashfs_remount(struct super_block *sb, int *flags, char *data)
 
 static void squashfs_put_super(struct super_block *sb)
 {
-	lock_kernel();
-
 	if (sb->s_fs_info) {
 		struct squashfs_sb_info *sbi = sb->s_fs_info;
 		squashfs_cache_delete(sbi->block_cache);
@@ -376,8 +367,6 @@ static void squashfs_put_super(struct super_block *sb)
 		kfree(sb->s_fs_info);
 		sb->s_fs_info = NULL;
 	}
-
-	unlock_kernel();
 }