netdev - Re: [PATCH][next] qtnfmac: replace qtnf_cmd_acl_data_size() with struct

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Date:   Thu, 4 Apr 2019 13:32:42 +0000
From:   Sergey Matyukevich <sergey.matyukevich.os@...ntenna.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
CC:     Igor Mitsyanko <imitsyanko@...ntenna.com>,
        Avinash Patil <avinashp@...ntenna.com>,
        Sergey Matyukevich <smatyukevich@...ntenna.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] qtnfmac: replace qtnf_cmd_acl_data_size() with
 struct_size()

> 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 foo {
>     int stuff;
>     struct boo entry[];
> };
> 
> size = sizeof(struct foo) + count * sizeof(struct boo);
> instance = kzalloc(size, GFP_KERNEL)
> 
> Instead of leaving these open-coded and prone to type mistakes, we can
> now use the new struct_size() helper:
> 
> size = struct_size(instance, entry, count);
> 
> or
> 
> instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL)
> 
> Based on the above, replace qtnf_cmd_acl_data_size() with the
> new struct_size() helper.
> 
> This code was detected with the help of Coccinelle.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---
>  drivers/net/wireless/quantenna/qtnfmac/commands.c | 15 ++++-----------
>  1 file changed, 4 insertions(+), 11 deletions(-)

Hi Gustavo,

Thanks for the patch! By the way, it does not apply cleanly, so it needs
to be rebased on top of the up-to-date wireless-drivers-next tree. Let
me know if you would prefer me to care about rebase. Then I will
add this patch to the upcoming series of qtnfmac fixes.

Reviewed-by: Sergey Matyukevich <sergey.matyukevich.os@...ntenna.com>

Regards,
Sergey