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TTY: devpts, do not set driver_data

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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.

Now driver_data are managed only in the pty driver. devpts_pty_new is
switched to accept what we used to dig out of tty_struct, i.e. device
node number and index.

This also removes a note about driver_data being set outside of the
driver.

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>
This commit is contained in:
Jiri Slaby
2012-10-18 22:26:29 +02:00
committed by Greg Kroah-Hartman
parent 162b97cfa2
commit f11afb6124
3 changed files with 16 additions and 24 deletions
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10
drivers/tty/pty.c
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@@ -4,9 +4,6 @@
* Added support for a Unix98-style ptmx device.
* -- C. Scott Ananian <cananian@alumni.princeton.edu>, 14-Jan-1998
*
* When reading this code see also fs/devpts. In particular note that the
* driver_data field is used by the devpts side as a binding to the devpts
* inode.
*/
#include <linux/module.h>
@@ -59,7 +56,7 @@ static void pty_close(struct tty_struct *tty, struct file *filp)
#ifdef CONFIG_UNIX98_PTYS
if (tty->driver == ptm_driver) {
mutex_lock(&devpts_mutex);
devpts_pty_kill(tty->link);
devpts_pty_kill(tty->link->driver_data);
mutex_unlock(&devpts_mutex);
}
#endif
@@ -651,7 +648,9 @@ static int ptmx_open(struct inode *inode, struct file *filp)
tty_add_file(tty, filp);
slave_inode = devpts_pty_new(inode, tty->link);
slave_inode = devpts_pty_new(inode,
MKDEV(UNIX98_PTY_SLAVE_MAJOR, index), index,
tty->link);
if (IS_ERR(slave_inode)) {
retval = PTR_ERR(slave_inode);
goto err_release;
@@ -662,6 +661,7 @@ static int ptmx_open(struct inode *inode, struct file *filp)
goto err_release;
tty_unlock(tty);
tty->link->driver_data = slave_inode;
return 0;
err_release:
tty_unlock(tty);