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>

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index e18604b..d8653ab 100644 (file)
--- 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,