linux-kernel - Re: [PATCH][next] Bluetooth: a2mp: Use struct

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Message-ID: <3f777ed6-28c7-a0fd-f1a5-2975deea0e40@embeddedor.com>
Date:   Mon, 18 Feb 2019 11:50:53 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Marcel Holtmann <marcel@...tmann.org>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] Bluetooth: a2mp: Use struct_size() helper



On 2/18/19 7:02 AM, Marcel Holtmann wrote:
> Hi Gustavo,
> 
>> 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 = alloc(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);
>> instance = alloc(size, GFP_KERNEL)
>>
>> This code was detected with the help of Coccinelle.
>>
>> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
>> ---
>> net/bluetooth/a2mp.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> patch has been applied to bluetooth-next tree.
> 

Thanks Marcel.

--
Gustavo