Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull VFS fixes from Al Viro:
 "Several fixes + obvious cleanup (you've missed a couple of open-coded
  can_lookup() back then)"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  snd_pcm_link(): fix a leak...
  use can_lookup() instead of direct checks of ->i_op->lookup
  move exit_task_namespaces() outside of exit_notify()
  fput: task_work_add() can fail if the caller has passed exit_task_work()
  ncpfs: fix rmdir returns Device or resource busy

fs/file_table.c

@@ -306,17 +306,18 @@ void fput(struct file *file)
 {
 	if (atomic_long_dec_and_test(&file->f_count)) {
 		struct task_struct *task = current;
-		file_sb_list_del(file);
-		if (unlikely(in_interrupt() || task->flags & PF_KTHREAD)) {
 		unsigned long flags;
+
+		file_sb_list_del(file);
+		if (likely(!in_interrupt() && !(task->flags & PF_KTHREAD))) {
+			init_task_work(&file->f_u.fu_rcuhead, ____fput);
+			if (!task_work_add(task, &file->f_u.fu_rcuhead, true))
+				return;
+		}
 		spin_lock_irqsave(&delayed_fput_lock, flags);
 		list_add(&file->f_u.fu_list, &delayed_fput_list);
 		schedule_work(&delayed_fput_work);
 		spin_unlock_irqrestore(&delayed_fput_lock, flags);
-			return;
-		}
-		init_task_work(&file->f_u.fu_rcuhead, ____fput);
-		task_work_add(task, &file->f_u.fu_rcuhead, true);
 	}
 }
 

fs/namei.c

@@ -1976,7 +1976,7 @@ static int path_lookupat(int dfd, const char *name,
 		err = complete_walk(nd);
 
 	if (!err && nd->flags & LOOKUP_DIRECTORY) {
-		if (!nd->inode->i_op->lookup) {
+		if (!can_lookup(nd->inode)) {
 			path_put(&nd->path);
 			err = -ENOTDIR;
 		}
@@ -2850,7 +2850,7 @@ static int do_last(struct nameidata *nd, struct path *path,
 	if ((open_flag & O_CREAT) && S_ISDIR(nd->inode->i_mode))
 		goto out;
 	error = -ENOTDIR;
-	if ((nd->flags & LOOKUP_DIRECTORY) && !nd->inode->i_op->lookup)
+	if ((nd->flags & LOOKUP_DIRECTORY) && !can_lookup(nd->inode))
 		goto out;
 	audit_inode(name, nd->path.dentry, 0);
 finish_open:

fs/ncpfs/dir.c

@@ -1029,15 +1029,6 @@ static int ncp_rmdir(struct inode *dir, struct dentry *dentry)
 	DPRINTK("ncp_rmdir: removing %s/%s\n",
 		dentry->d_parent->d_name.name, dentry->d_name.name);
 
-	/*
-	 * fail with EBUSY if there are still references to this
-	 * directory.
-	 */
-	dentry_unhash(dentry);
-	error = -EBUSY;
-	if (!d_unhashed(dentry))
-		goto out;
-
 	len = sizeof(__name);
 	error = ncp_io2vol(server, __name, &len, dentry->d_name.name,
 			   dentry->d_name.len, !ncp_preserve_case(dir));

kernel/exit.c

@@ -649,7 +649,6 @@ static void exit_notify(struct task_struct *tsk, int group_dead)
 	 *	jobs, send them a SIGHUP and then a SIGCONT.  (POSIX 3.2.2.2)
 	 */
 	forget_original_parent(tsk);
-	exit_task_namespaces(tsk);
 
 	write_lock_irq(&tasklist_lock);
 	if (group_dead)
@@ -795,6 +794,7 @@ void do_exit(long code)
 	exit_shm(tsk);
 	exit_files(tsk);
 	exit_fs(tsk);
+	exit_task_namespaces(tsk);
 	exit_task_work(tsk);
 	check_stack_usage();
 	exit_thread();

sound/core/pcm_native.c

@@ -1649,6 +1649,7 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
 	}
 	if (!snd_pcm_stream_linked(substream)) {
 		substream->group = group;
+		group = NULL;
 		spin_lock_init(&substream->group->lock);
 		INIT_LIST_HEAD(&substream->group->substreams);
 		list_add_tail(&substream->link_list, &substream->group->substreams);
@@ -1663,7 +1664,6 @@ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
  _nolock:
 	snd_card_unref(substream1->pcm->card);
 	fput_light(file, fput_needed);
-	if (res < 0)
 	kfree(group);
 	return res;
 }