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Move tty lookup/reopen to caller 

Move tty_driver_lookup_tty() and tty_reopen() from tty_init_dev()
into tty_open() (one of the two callers of tty_init_dev()).  These
calls are not really required in ptmx_open(), the other caller,
since ptmx_open() would be setting up a new tty.

Changelog[v2]:
	- remove the lookup and reopen calls from ptmx_open
	- merge with recent changes to ttydev tree

Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sukadev Bhattiprolu 2008-10-13 10:42:49 +01:00 committed by Linus Torvalds
parent bf970ee46e
commit 4a2b5fddd5
1 changed files with 16 additions and 15 deletions
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31
drivers/char/tty_io.c
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@ -1376,19 +1376,6 @@ struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
struct tty_struct *tty;
int retval;
/* check whether we're reopening an existing tty */
tty = tty_driver_lookup_tty(driver, idx);
if (IS_ERR(tty))
return tty;
if (tty) {
retval = tty_reopen(tty);
if (retval)
return ERR_PTR(retval);
return tty;
}
/* Check if pty master is being opened multiple times */
if (driver->subtype == PTY_TYPE_MASTER &&
(driver->flags & TTY_DRIVER_DEVPTS_MEM) && !first_ok)
@ -1790,7 +1777,7 @@ void tty_release_dev(struct file *filp)
static int __tty_open(struct inode *inode, struct file *filp)
{
struct tty_struct *tty;
struct tty_struct *tty = NULL;
int noctty, retval;
struct tty_driver *driver;
int index;
@ -1847,7 +1834,21 @@ retry_open:
return -ENODEV;
}
got_driver:
tty = tty_init_dev(driver, index, 0);
if (!tty) {
/* check whether we're reopening an existing tty */
tty = tty_driver_lookup_tty(driver, index);
if (IS_ERR(tty))
return PTR_ERR(tty);
}
if (tty) {
retval = tty_reopen(tty);
if (retval)
tty = ERR_PTR(retval);
} else
tty = tty_init_dev(driver, index, 0);
mutex_unlock(&tty_mutex);
tty_driver_kref_put(driver);
if (IS_ERR(tty))