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TTY: pty, cleanup the pty counting 

Instead of the hackish way of counting ptys, let's define a specific
->remove hook both from slave and master. And decrease the count only
for master.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jiri Slaby 2011-11-16 16:27:11 +01:00 committed by Greg Kroah-Hartman
parent c0d92be6bc
commit 484af54d43
1 changed files with 9 additions and 17 deletions
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26
drivers/tty/pty.c
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@ -446,19 +446,8 @@ static inline void legacy_pty_init(void) { }
int pty_limit = NR_UNIX98_PTY_DEFAULT;
static int pty_limit_min;
static int pty_limit_max = NR_UNIX98_PTY_MAX;
static int tty_count;
static int pty_count;
static inline void pty_inc_count(void)
{
pty_count = (++tty_count) / 2;
}
static inline void pty_dec_count(void)
{
pty_count = (--tty_count) / 2;
}
static struct cdev ptmx_cdev;
static struct ctl_table pty_table[] = {
@ -600,8 +589,7 @@ static int pty_unix98_install(struct tty_driver *driver, struct tty_struct *tty)
*/
tty_driver_kref_get(driver);
tty->count++;
pty_inc_count(); /* tty */
pty_inc_count(); /* tty->link */
pty_count++;
return 0;
err_free_mem:
deinitialize_tty_struct(o_tty);
@ -613,15 +601,19 @@ err_free_tty:
return -ENOMEM;
}
static void pty_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
static void ptm_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
{
pty_count--;
}
static void pts_unix98_remove(struct tty_driver *driver, struct tty_struct *tty)
{
pty_dec_count();
}
static const struct tty_operations ptm_unix98_ops = {
.lookup = ptm_unix98_lookup,
.install = pty_unix98_install,
.remove = pty_unix98_remove,
.remove = ptm_unix98_remove,
.open = pty_open,
.close = pty_close,
.write = pty_write,
@ -638,7 +630,7 @@ static const struct tty_operations ptm_unix98_ops = {
static const struct tty_operations pty_unix98_ops = {
.lookup = pts_unix98_lookup,
.install = pty_unix98_install,
.remove = pty_unix98_remove,
.remove = pts_unix98_remove,
.open = pty_open,
.close = pty_close,
.write = pty_write,