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| author | Jiri Slaby <jslaby@suse.cz> | 2011-11-16 16:27:11 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-17 11:42:09 -0800 |
| commit | 484af54d432c39891ff27ad0e5194d28513063cc (patch) | |
| tree | cd656b995aef9ce30927fc94ca994e82558c1363 /drivers/tty/pty.c | |
| parent | c0d92be6bc4fbbf6402fde2c0bc08fc4d2b58430 (diff) | |
| download | linux-484af54d432c39891ff27ad0e5194d28513063cc.tar.gz linux-484af54d432c39891ff27ad0e5194d28513063cc.tar.bz2 linux-484af54d432c39891ff27ad0e5194d28513063cc.zip | |
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>
Diffstat (limited to 'drivers/tty/pty.c')
| -rw-r--r-- | drivers/tty/pty.c | 26 |
1 files changed, 9 insertions, 17 deletions
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c index e18604b3fc7d..d8653ab6f498 100644 --- a/drivers/tty/pty.c +++ b/drivers/tty/pty.c @@ -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, |