tty: Remove __GFP_NOFAIL from tty_add_file()

This patch removes __GFP_NOFAIL use from tty_add_file() and adds proper error
handling to the call-sites of the function.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/char/pty.c b/drivers/char/pty.c
index c350d01..923a485 100644 (file)
--- a/drivers/char/pty.c
+++ b/drivers/char/pty.c
@@ -676,7 +676,9 @@ static int ptmx_open(struct inode *inode, struct file *filp)
 
        set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
 
-       tty_add_file(tty, filp);
+       retval = tty_add_file(tty, filp);
+       if (retval)
+               goto out;
 
        retval = devpts_pty_new(inode, tty->link);
        if (retval)

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index dc184d4..d6c659f 100644 (file)
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -196,12 +196,13 @@ static inline struct tty_struct *file_tty(struct file *file)
 }
 
 /* Associate a new file with the tty structure */
-void tty_add_file(struct tty_struct *tty, struct file *file)
+int tty_add_file(struct tty_struct *tty, struct file *file)
 {
        struct tty_file_private *priv;
 
-       /* XXX: must implement proper error handling in callers */
-       priv = kmalloc(sizeof(*priv), GFP_KERNEL|__GFP_NOFAIL);
+       priv = kmalloc(sizeof(*priv), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
 
        priv->tty = tty;
        priv->file = file;
@@ -210,6 +211,8 @@ void tty_add_file(struct tty_struct *tty, struct file *file)
        spin_lock(&tty_files_lock);
        list_add(&priv->list, &tty->tty_files);
        spin_unlock(&tty_files_lock);
+
+       return 0;
 }
 
 /* Delete file from its tty */
@@ -1877,7 +1880,11 @@ got_driver:
                return PTR_ERR(tty);
        }
 
-       tty_add_file(tty, filp);
+       retval = tty_add_file(tty, filp);
+       if (retval) {
+               tty_unlock();
+               return retval;
+       }
 
        check_tty_count(tty, "tty_open");
        if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&

diff --git a/include/linux/tty.h b/include/linux/tty.h
index d94eb86..86be0cd 100644 (file)
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -466,7 +466,7 @@ extern void proc_clear_tty(struct task_struct *p);
 extern struct tty_struct *get_current_tty(void);
 extern void tty_default_fops(struct file_operations *fops);
 extern struct tty_struct *alloc_tty_struct(void);
-extern void tty_add_file(struct tty_struct *tty, struct file *file);
+extern int tty_add_file(struct tty_struct *tty, struct file *file);
 extern void free_tty_struct(struct tty_struct *tty);
 extern void initialize_tty_struct(struct tty_struct *tty,
                struct tty_driver *driver, int idx);