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Subject: Re: [PATCH][next] qtnfmac: replace qtnf_cmd_acl_data_size() with
 struct_size()
To:     Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Cc:     Igor Mitsyanko <imitsyanko@quantenna.com>,
        Avinash Patil <avinashp@quantenna.com>,
        Sergey Matyukevich <smatyukevich@quantenna.com>,
        Kalle Valo <kvalo@codeaurora.org>,
        "David S. Miller" <davem@davemloft.net>,
        "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <20190403170236.GA31637@embeddedor>
 <20190404133234.2uatru2vlw3ntrmv@bars>
From:   "Gustavo A. R. Silva" <gustavo@embeddedor.com>
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Message-ID: <e56579c6-da6e-4cb2-90b1-89e7774debf9@embeddedor.com>
Date:   Thu, 4 Apr 2019 11:01:46 -0500
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On 4/4/19 8:32 AM, Sergey Matyukevich 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 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@embeddedor.com>
>> ---
>>  drivers/net/wireless/quantenna/qtnfmac/commands.c | 15 ++++-----------
>>  1 file changed, 4 insertions(+), 11 deletions(-)
> 
> Hi Gustavo,
> 

Hey Sergey,

> 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.
> 

Don't worry. I'll do it and send this again.

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

I'll add your RB.

Thanks!
--
Gustavo