[PATCH 01/21] TTY: devpts, don't care about TTY in devpts_get_tty

From: Jiri Slaby
Date: Thu Oct 18 2012 - 16:31:51 EST


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.

First, here we remove TTY from devpts_get_tty and rename it to
devpts_get_priv. Note we do not remove type safety, we just shift the
[implicit] (void *) cast one layer up.

index was unused in devpts_get_tty, so remove that from the prototype
too.

Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/tty/pty.c | 2 +-
fs/devpts/inode.c | 9 ++++-----
include/linux/devpts_fs.h | 7 +++----
3 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index a82b399..65f7671 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -547,7 +547,7 @@ static struct tty_struct *pts_unix98_lookup(struct tty_driver *driver,
struct tty_struct *tty;

mutex_lock(&devpts_mutex);
- tty = devpts_get_tty(pts_inode, idx);
+ tty = devpts_get_priv(pts_inode);
mutex_unlock(&devpts_mutex);
/* Master must be open before slave */
if (!tty)
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 14afbab..4796580 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -593,10 +593,10 @@ int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty)
return ret;
}

-struct tty_struct *devpts_get_tty(struct inode *pts_inode, int number)
+void *devpts_get_priv(struct inode *pts_inode)
{
struct dentry *dentry;
- struct tty_struct *tty;
+ void *priv = NULL;

BUG_ON(pts_inode->i_rdev == MKDEV(TTYAUX_MAJOR, PTMX_MINOR));

@@ -605,13 +605,12 @@ struct tty_struct *devpts_get_tty(struct inode *pts_inode, int number)
if (!dentry)
return NULL;

- tty = NULL;
if (pts_inode->i_sb->s_magic == DEVPTS_SUPER_MAGIC)
- tty = (struct tty_struct *)pts_inode->i_private;
+ priv = pts_inode->i_private;

dput(dentry);

- return tty;
+ return priv;
}

void devpts_pty_kill(struct tty_struct *tty)
diff --git a/include/linux/devpts_fs.h b/include/linux/devpts_fs.h
index 5ce0e5f..de635a5 100644
--- a/include/linux/devpts_fs.h
+++ b/include/linux/devpts_fs.h
@@ -21,8 +21,8 @@ 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);
-/* get tty structure */
-struct tty_struct *devpts_get_tty(struct inode *pts_inode, int number);
+/* get private structure */
+void *devpts_get_priv(struct inode *pts_inode);
/* unlink */
void devpts_pty_kill(struct tty_struct *tty);

@@ -36,8 +36,7 @@ static inline int devpts_pty_new(struct inode *ptmx_inode,
{
return -EINVAL;
}
-static inline struct tty_struct *devpts_get_tty(struct inode *pts_inode,
- int number)
+static inline void *devpts_get_priv(struct inode *pts_inode)
{
return NULL;
}
--
1.7.12.3


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