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-rw-r--r--drivers/tty/pty.c16
-rw-r--r--drivers/tty/tty_io.c47
-rw-r--r--include/linux/tty.h4
3 files changed, 49 insertions, 18 deletions
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 98b6e3bdb00..7613f95f2d6 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -657,12 +657,18 @@ static int ptmx_open(struct inode *inode, struct file *filp)
nonseekable_open(inode, filp);
+ retval = tty_alloc_file(filp);
+ if (retval)
+ return retval;
+
/* find a device that is not in use. */
tty_lock();
index = devpts_new_index(inode);
tty_unlock();
- if (index < 0)
- return index;
+ if (index < 0) {
+ retval = index;
+ goto err_file;
+ }
mutex_lock(&tty_mutex);
tty_lock();
@@ -676,9 +682,7 @@ static int ptmx_open(struct inode *inode, struct file *filp)
set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
- retval = tty_add_file(tty, filp);
- if (retval)
- goto out;
+ tty_add_file(tty, filp);
retval = devpts_pty_new(inode, tty->link);
if (retval)
@@ -697,6 +701,8 @@ out2:
out:
devpts_kill_index(inode, index);
tty_unlock();
+err_file:
+ tty_free_file(filp);
return retval;
}
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 6913da8f202..767ecbb4761 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -194,8 +194,7 @@ static inline struct tty_struct *file_tty(struct file *file)
return ((struct tty_file_private *)file->private_data)->tty;
}
-/* Associate a new file with the tty structure */
-int tty_add_file(struct tty_struct *tty, struct file *file)
+int tty_alloc_file(struct file *file)
{
struct tty_file_private *priv;
@@ -203,15 +202,36 @@ int tty_add_file(struct tty_struct *tty, struct file *file)
if (!priv)
return -ENOMEM;
+ file->private_data = priv;
+
+ return 0;
+}
+
+/* Associate a new file with the tty structure */
+void tty_add_file(struct tty_struct *tty, struct file *file)
+{
+ struct tty_file_private *priv = file->private_data;
+
priv->tty = tty;
priv->file = file;
- file->private_data = priv;
spin_lock(&tty_files_lock);
list_add(&priv->list, &tty->tty_files);
spin_unlock(&tty_files_lock);
+}
- return 0;
+/**
+ * tty_free_file - free file->private_data
+ *
+ * This shall be used only for fail path handling when tty_add_file was not
+ * called yet.
+ */
+void tty_free_file(struct file *file)
+{
+ struct tty_file_private *priv = file->private_data;
+
+ file->private_data = NULL;
+ kfree(priv);
}
/* Delete file from its tty */
@@ -222,8 +242,7 @@ void tty_del_file(struct file *file)
spin_lock(&tty_files_lock);
list_del(&priv->list);
spin_unlock(&tty_files_lock);
- file->private_data = NULL;
- kfree(priv);
+ tty_free_file(file);
}
@@ -1812,6 +1831,10 @@ static int tty_open(struct inode *inode, struct file *filp)
nonseekable_open(inode, filp);
retry_open:
+ retval = tty_alloc_file(filp);
+ if (retval)
+ return -ENOMEM;
+
noctty = filp->f_flags & O_NOCTTY;
index = -1;
retval = 0;
@@ -1824,6 +1847,7 @@ retry_open:
if (!tty) {
tty_unlock();
mutex_unlock(&tty_mutex);
+ tty_free_file(filp);
return -ENXIO;
}
driver = tty_driver_kref_get(tty->driver);
@@ -1856,6 +1880,7 @@ retry_open:
}
tty_unlock();
mutex_unlock(&tty_mutex);
+ tty_free_file(filp);
return -ENODEV;
}
@@ -1863,6 +1888,7 @@ retry_open:
if (!driver) {
tty_unlock();
mutex_unlock(&tty_mutex);
+ tty_free_file(filp);
return -ENODEV;
}
got_driver:
@@ -1874,6 +1900,7 @@ got_driver:
tty_unlock();
mutex_unlock(&tty_mutex);
tty_driver_kref_put(driver);
+ tty_free_file(filp);
return PTR_ERR(tty);
}
}
@@ -1889,15 +1916,11 @@ got_driver:
tty_driver_kref_put(driver);
if (IS_ERR(tty)) {
tty_unlock();
+ tty_free_file(filp);
return PTR_ERR(tty);
}
- retval = tty_add_file(tty, filp);
- if (retval) {
- tty_unlock();
- tty_release(inode, filp);
- return retval;
- }
+ tty_add_file(tty, filp);
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 64c12a3e65f..ff2925aa4e7 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -471,7 +471,9 @@ 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 int tty_add_file(struct tty_struct *tty, struct file *file);
+extern int tty_alloc_file(struct file *file);
+extern void tty_add_file(struct tty_struct *tty, struct file *file);
+extern void tty_free_file(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);