tty: Remove lots of NULL checks

Many tty drivers contain 'can't happen' checks against NULL pointers passed
in by the tty layer. These have never been possible to occur. Even more
importantly if they ever do occur we want to know as it would be a serious
bug.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 21 deletions

diff --git a/drivers/char/generic_serial.c b/drivers/char/generic_serial.c
index 19d3afb0e50c..c6090f84a2e4 100644
--- a/drivers/char/generic_serial.c
+++ b/drivers/char/generic_serial.c
@@ -54,8 +54,6 @@ int gs_put_char(struct tty_struct * tty, unsigned char ch)
 
         func_enter (); 
 
-        if (!tty) return 0;
-
         port = tty->driver_data;
 
         if (!port) return 0;
@@ -97,8 +95,6 @@ int gs_write(struct tty_struct * tty,
 
         func_enter ();
 
-        if (!tty) return 0;
-
         port = tty->driver_data;
 
         if (!port) return 0;
@@ -185,7 +181,6 @@ static int gs_real_chars_in_buffer(struct tty_struct *tty)
         struct gs_port *port;
         func_enter ();
 
-        if (!tty) return 0;
         port = tty->driver_data;
 
         if (!port->rd) return 0;
@@ -274,8 +269,6 @@ void gs_flush_buffer(struct tty_struct *tty)
 
         func_enter ();
 
-        if (!tty) return;
-
         port = tty->driver_data;
 
         if (!port) return;
@@ -296,8 +289,6 @@ void gs_flush_chars(struct tty_struct * tty)
 
         func_enter ();
 
-        if (!tty) return;
-
         port = tty->driver_data;
 
         if (!port) return;
@@ -321,8 +312,6 @@ void gs_stop(struct tty_struct * tty)
 
         func_enter ();
 
-        if (!tty) return;
-
         port = tty->driver_data;
 
         if (!port) return;
@@ -341,8 +330,6 @@ void gs_start(struct tty_struct * tty)
 {
         struct gs_port *port;
 
-        if (!tty) return;
-
         port = tty->driver_data;
 
         if (!port) return;
@@ -393,8 +380,6 @@ void gs_hangup(struct tty_struct *tty)
 
         func_enter ();
 
-        if (!tty) return;
-
         port = tty->driver_data;
         tty = port->port.tty;
         if (!tty) 
@@ -426,8 +411,6 @@ int gs_block_til_ready(void *port_, struct file * filp)
 
         tty = port->port.tty;
 
-        if (!tty) return 0;
-
         gs_dprintk (GS_DEBUG_BTR, "Entering gs_block_till_ready.\n"); 
         /*
          * If the device is in the middle of being closed, then block
@@ -523,8 +506,6 @@ void gs_close(struct tty_struct * tty, struct file * filp)
         
         func_enter ();
 
-        if (!tty) return;
-
         port = (struct gs_port *) tty->driver_data;
 
         if (!port) return;
@@ -621,8 +602,6 @@ void gs_set_termios (struct tty_struct * tty,
 
         func_enter();
 
-        if (!tty) return;
-
         port = tty->driver_data;
 
         if (!port) return;