linux-kernel - Re: [PATCH] tty: fix badzero.cocci warnings

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Message-ID: <56920210.4010001@hurleysoftware.com>
Date:	Sat, 9 Jan 2016 23:02:40 -0800
From:	Peter Hurley <peter@...leysoftware.com>
To:	kbuild test robot <lkp@...el.com>
Cc:	kbuild-all@...org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tty: fix badzero.cocci warnings

On 01/09/2016 10:24 PM, kbuild test robot wrote:
> 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

Not sure what possessed me to write 'cons_filp != 0'. Not my style, for sure.
Thanks.

Regards,
Peter Hurley

> CC: Peter Hurley <peter@...leysoftware.com>
> Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
> ---
> 
>  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_kref_put(tty);
>  
> -	tty_ldisc_hangup(tty, cons_filp != 0);
> +	tty_ldisc_hangup(tty, cons_filp != NULL);
>  
>  	spin_lock_irq(&tty->ctrl_lock);
>  	clear_bit(TTY_THROTTLED, &tty->flags);
>