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Subject[PATCH] tty: fix badzero.cocci warnings
drivers/tty/tty_io.c:731:36-37: WARNING comparing pointer to 0

Compare pointer-typed values to NULL rather than 0

Semantic patch information:
This makes an effort to choose between !x and x == NULL. !x is used
if it has previously been used with the function used to initialize x.
This relies on type information. More type information can be obtained
using the option -all_includes and the option -I to specify an
include path.

Generated by: scripts/coccinelle/null/badzero.cocci

CC: Peter Hurley <>
Signed-off-by: Fengguang Wu <>

tty_io.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -728,7 +728,7 @@ static void __tty_hangup(struct tty_stru
while (refs--)

- tty_ldisc_hangup(tty, cons_filp != 0);
+ tty_ldisc_hangup(tty, cons_filp != NULL);

clear_bit(TTY_THROTTLED, &tty->flags);
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