linux-kernel - Re: [PATCH 1/10] drivers/s390/char: Use kstrdup

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Date:	Fri, 14 May 2010 22:10:54 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux390@...ibm.com, linux-s390@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/10] drivers/s390/char: Use kstrdup

This introduced an unused variable.  I will send a revised version 
shortly.

julia


On Fri, 14 May 2010, Julia Lawall wrote:

> From: Julia Lawall <julia@...u.dk>
> 
> Use kstrdup when the goal of an allocation is copy a string into the
> allocated region.
> 
> The semantic patch that makes this change is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression x,from,to;
> expression flag,E1,E2,E3;
> statement S;
> @@
> 
> -   x = strlen(from) + 1;
>     ... when != \( x = E1 \| from = E1 \)
> -   to = \(kmalloc\|kzalloc\)(x,flag);
> +   to = kstrdup(from, flag);
>     ... when != \(x = E2 \| from = E2 \| to = E2 \)
>     if (to==NULL || ...) S
>     ... when != \(x = E3 \| from = E3 \| to = E3 \)
> -   memcpy(to, from, x);
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
>  drivers/s390/char/keyboard.c |    5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff -u -p a/drivers/s390/char/keyboard.c b/drivers/s390/char/keyboard.c
> --- a/drivers/s390/char/keyboard.c
> +++ b/drivers/s390/char/keyboard.c
> @@ -72,11 +72,10 @@ kbd_alloc(void) {
>  		goto out_maps;
>  	for (i = 0; i < ARRAY_SIZE(func_table); i++) {
>  		if (func_table[i]) {
> -			len = strlen(func_table[i]) + 1;
> -			kbd->func_table[i] = kmalloc(len, GFP_KERNEL);
> +			kbd->func_table[i] = kstrdup(func_table[i],
> +						     GFP_KERNEL);
>  			if (!kbd->func_table[i])
>  				goto out_func;
> -			memcpy(kbd->func_table[i], func_table[i], len);
>  		}
>  	}
>  	kbd->fn_handler =
> 
--
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