linux-kernel - drivers/net/wireless spring cleaning

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Message-ID: <87ftdzq9o0.fsf_-_@tynnyri.adurom.net>
Date:   Mon, 23 Mar 2020 19:10:39 +0200
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: drivers/net/wireless spring cleaning

(changing the subject)

Luis Chamberlain <mcgrof@...nel.org> writes:

> On Mon, Feb 24, 2020 at 07:20:08PM -0600, Gustavo A. R. Silva wrote:
>> The current codebase makes use of the zero-length array language
>> extension to the C90 standard, but the preferred mechanism to declare
>> variable-length types such as these ones is a flexible array member[1][2],
>> introduced in C99:
>> 
>> struct foo {
>>         int stuff;
>>         struct boo array[];
>> };
>> 
>> By making use of the mechanism above, we will get a compiler warning
>> in case the flexible array does not occur last in the structure, which
>> will help us prevent some kind of undefined behavior bugs from being
>> inadvertently introduced[3] to the codebase from now on.
>> 
>> Also, notice that, dynamic memory allocations won't be affected by
>> this change:
>> 
>> "Flexible array members have incomplete type, and so the sizeof operator
>> may not be applied. As a quirk of the original implementation of
>> zero-length arrays, sizeof evaluates to zero."[1]
>> 
>> This issue was found with the help of Coccinelle.
>> 
>> [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
>> [2] https://github.com/KSPP/linux/issues/21
>> [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
>> 
>> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
>
> I'd rather we just remove this driver completely, as it has a
> replacement upstream p54, and remained upstream just for a theoretical
> period of time someone was not able to use p54 anymore. I'll follow up
> with a removal of the driver.

Yeah, please do.

I wonder if we should do other spring cleanup as well and remove drivers
like ray_cs and wl3501, I have not seen any activity on those for years.
Also rndis_wlan would be other candidate for removal.

Anyone know if these drivers are used or if they even work anymore?

-- 
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches