BKL: Remove BKL from Amiga FFS

The BKL is only used in put_super, fill_super and remount_fs that are all
three protected by the superblocks s_umount rw_semaphore. Therefore it is
safe to remove the BKL entirely.
Signed-off-by: NJan Blunck <jblunck@infradead.org>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

fs/affs/super.c

@@ -16,7 +16,6 @@
 #include <linux/parser.h>
 #include <linux/magic.h>
 #include <linux/sched.h>
-#include <linux/smp_lock.h>
 #include <linux/slab.h>
 #include "affs.h"
 
@@ -46,8 +45,6 @@ affs_put_super(struct super_block *sb)
 	struct affs_sb_info *sbi = AFFS_SB(sb);
 	pr_debug("AFFS: put_super()\n");
 
-	lock_kernel();
-
 	if (!(sb->s_flags & MS_RDONLY) && sb->s_dirt)
 		affs_commit_super(sb, 1, 1);
 
@@ -56,8 +53,6 @@ affs_put_super(struct super_block *sb)
 	affs_brelse(sbi->s_root_bh);
 	kfree(sbi);
 	sb->s_fs_info = NULL;
-
-	unlock_kernel();
 }
 
 static void
@@ -291,8 +286,6 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent)
 	u8			 sig[4];
 	int			 ret = -EINVAL;
 
-	lock_kernel();
-
 	save_mount_options(sb, data);
 
 	pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
@@ -302,10 +295,9 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_flags |= MS_NODIRATIME;
 
 	sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
-	if (!sbi) {
-		unlock_kernel();
+	if (!sbi)
 		return -ENOMEM;
-	}
+
 	sb->s_fs_info = sbi;
 	mutex_init(&sbi->s_bmlock);
 	spin_lock_init(&sbi->symlink_lock);
@@ -316,7 +308,6 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent)
 		printk(KERN_ERR "AFFS: Error parsing options\n");
 		kfree(sbi->s_prefix);
 		kfree(sbi);
-		unlock_kernel();
 		return -EINVAL;
 	}
 	/* N.B. after this point s_prefix must be released */
@@ -487,7 +478,6 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_root->d_op = &affs_dentry_operations;
 
 	pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
-	unlock_kernel();
 	return 0;
 
 	/*
@@ -502,7 +492,6 @@ static int affs_fill_super(struct super_block *sb, void *data, int silent)
 	kfree(sbi->s_prefix);
 	kfree(sbi);
 	sb->s_fs_info = NULL;
-	unlock_kernel();
 	return ret;
 }
 
@@ -534,7 +523,7 @@ affs_remount(struct super_block *sb, int *flags, char *data)
 		kfree(new_opts);
 		return -EINVAL;
 	}
-	lock_kernel();
+
 	replace_mount_options(sb, new_opts);
 
 	sbi->s_flags = mount_flags;
@@ -550,17 +539,15 @@ affs_remount(struct super_block *sb, int *flags, char *data)
 	memcpy(sbi->s_volume, volume, 32);
 	spin_unlock(&sbi->symlink_lock);
 
-	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
-		unlock_kernel();
+	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 		return 0;
-	}
+
 	if (*flags & MS_RDONLY) {
 		affs_write_super(sb);
 		affs_free_bitmap(sb);
 	} else
 		res = affs_init_bitmap(sb, flags);
 
-	unlock_kernel();
 	return res;
 }