TTY: devpts, return created inode from devpts_pty_new

The goal is to stop setting and using tty->driver_data in devpts code.
It should be used solely by the driver's code, pty in this case.

For the cleanup of layering, we will need the inode created in
devpts_pty_new to be stored into slave's driver_data. So we convert
devpts_pty_new to return the inode or an ERR_PTR-encoded error in case
of failure.

The move of 'inode = new_inode(sb);' from declarators to the code is
only cosmetical, but it makes the code easier to read.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 15 insertions, 12 deletions

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 65f767154d12..9985b451e937 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -614,6 +614,7 @@ static const struct tty_operations pty_unix98_ops = {
 static int ptmx_open(struct inode *inode, struct file *filp)
 {
         struct tty_struct *tty;
+        struct inode *slave_inode;
         int retval;
         int index;
 
@@ -650,9 +651,11 @@ static int ptmx_open(struct inode *inode, struct file *filp)
 
         tty_add_file(tty, filp);
 
-        retval = devpts_pty_new(inode, tty->link);
-        if (retval)
+        slave_inode = devpts_pty_new(inode, tty->link);
+        if (IS_ERR(slave_inode)) {
+                retval = PTR_ERR(slave_inode);
                 goto err_release;
+        }
 
         retval = ptm_driver->ops->open(tty, filp);
         if (retval)
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 47965807884d..ec3bab716c05 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -545,7 +545,7 @@ void devpts_kill_index(struct inode *ptmx_inode, int idx)
         mutex_unlock(&allocated_ptys_lock);
 }
 
-int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty)
+struct inode *devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty)
 {
         /* tty layer puts index from devpts_new_index() in here */
         int number = tty->index;
@@ -553,19 +553,19 @@ int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty)
         dev_t device = MKDEV(driver->major, driver->minor_start+number);
         struct dentry *dentry;
         struct super_block *sb = pts_sb_from_inode(ptmx_inode);
-        struct inode *inode = new_inode(sb);
+        struct inode *inode;
         struct dentry *root = sb->s_root;
         struct pts_fs_info *fsi = DEVPTS_SB(sb);
         struct pts_mount_opts *opts = &fsi->mount_opts;
-        int ret = 0;
         char s[12];
 
         /* We're supposed to be given the slave end of a pty */
         BUG_ON(driver->type != TTY_DRIVER_TYPE_PTY);
         BUG_ON(driver->subtype != PTY_TYPE_SLAVE);
 
+        inode = new_inode(sb);
         if (!inode)
-                return -ENOMEM;
+                return ERR_PTR(-ENOMEM);
 
         inode->i_ino = number + 3;
         inode->i_uid = opts->setuid ? opts->uid : current_fsuid();
@@ -585,12 +585,12 @@ int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty)
                 fsnotify_create(root->d_inode, dentry);
         } else {
                 iput(inode);
-                ret = -ENOMEM;
+                inode = ERR_PTR(-ENOMEM);
         }
 
         mutex_unlock(&root->d_inode->i_mutex);
 
-        return ret;
+        return inode;
 }
 
 void *devpts_get_priv(struct inode *pts_inode)
diff --git a/include/linux/devpts_fs.h b/include/linux/devpts_fs.h
index de635a5505ea..4ca846f16fe5 100644
--- a/include/linux/devpts_fs.h
+++ b/include/linux/devpts_fs.h
@@ -20,7 +20,7 @@
 int devpts_new_index(struct inode *ptmx_inode);
 void devpts_kill_index(struct inode *ptmx_inode, int idx);
 /* mknod in devpts */
-int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty);
+struct inode *devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty);
 /* get private structure */
 void *devpts_get_priv(struct inode *pts_inode);
 /* unlink */
@@ -31,10 +31,10 @@ void devpts_pty_kill(struct tty_struct *tty);
 /* Dummy stubs in the no-pty case */
 static inline int devpts_new_index(struct inode *ptmx_inode) { return -EINVAL; }
 static inline void devpts_kill_index(struct inode *ptmx_inode, int idx) { }
-static inline int devpts_pty_new(struct inode *ptmx_inode,
-                                struct tty_struct *tty)
+static inline struct inode *devpts_pty_new(struct inode *ptmx_inode,
+                struct tty_struct *tty)
 {
-        return -EINVAL;
+        return ERR_PTR(-EINVAL);
 }
 static inline void *devpts_get_priv(struct inode *pts_inode)
 {