TTY: remove unneeded tty->index checks

Checking if tty->index is in bounds is not needed. The tty has the
index set in the initial open. This is done in get_tty_driver. And it
can be only in interval <0,driver->num).

So remove the tests which check exactly this interval. Some are
left untouched as they check against the current backing device count.
(Leaving apart that the check is racy in most of the cases.)

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 5 deletions

diff --git a/net/irda/ircomm/ircomm_tty.c b/net/irda/ircomm/ircomm_tty.c
index 828f88603d6..6b9d5a0e42f 100644
--- a/net/irda/ircomm/ircomm_tty.c
+++ b/net/irda/ircomm/ircomm_tty.c
@@ -365,16 +365,12 @@ static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
 static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
 {
         struct ircomm_tty_cb *self;
-        unsigned int line;
+        unsigned int line = tty->index;
         unsigned long   flags;
         int ret;
 
         IRDA_DEBUG(2, "%s()\n", __func__ );
 
-        line = tty->index;
-        if (line >= IRCOMM_TTY_PORTS)
-                return -ENODEV;
-
         /* Check if instance already exists */
         self = hashbin_lock_find(ircomm_tty, line, NULL);
         if (!self) {