linux-kernel - Re: [PATCH] leds: is31fl32xx: Use struct

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Message-ID: <20190901102633.GB29681@amd>
Date:   Sun, 1 Sep 2019 12:26:33 +0200
From:   Pavel Machek <pavel@....cz>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Dan Murphy <dmurphy@...com>, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] leds: is31fl32xx: Use struct_size() helper

On Fri 2019-08-30 13:14:48, Gustavo A. R. Silva wrote:
> One of the more common cases of allocation size calculations is finding
> the size of a structure that has a zero-sized array at the end, along
> with memory for some number of elements for that array. For example:
> 
> struct is31fl32xx_priv {
> 	...
>         struct is31fl32xx_led_data leds[0];
> };
> 
> Make use of the struct_size() helper instead of an open-coded version
> in order to avoid any potential type mistakes.
> 
> So, replace the following function:
> 
> static inline size_t sizeof_is31fl32xx_priv(int num_leds)
> {
>        return sizeof(struct is31fl32xx_priv) +
>                      (sizeof(struct is31fl32xx_led_data) * num_leds);
> }
> 
> with:
> 
> struct_size(priv, leds, count)
> 
> This code was detected with the help of Coccinelle.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Acked-by: Pavel Machek <pavel@....cz>
								Pavel
								
-- 
(english) http://www.livejournal.com/~pavelmachek
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