linux-kernel - Re: [PATCH] rtlwifi: use tasklet_setup to initialize rx_work

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Message-ID: <87pn1q8l0t.fsf@codeaurora.org>
Date:   Wed, 27 Jan 2021 17:19:46 +0200
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     Emil Renner Berthing <kernel@...il.dk>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Ping-Ke Shih <pkshih@...ltek.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Allen Pais <allen.lkml@...il.com>,
        Romain Perier <romain.perier@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rtlwifi: use tasklet_setup to initialize rx_work_tasklet

Willem de Bruijn <willemdebruijn.kernel@...il.com> writes:

> On Wed, Jan 27, 2021 at 5:23 AM Emil Renner Berthing <kernel@...il.dk> wrote:
>>
>> In commit d3ccc14dfe95 most of the tasklets in this driver was
>> updated to the new API. However for the rx_work_tasklet only the
>> type of the callback was changed from
>>   void _rtl_rx_work(unsigned long data)
>> to
>>   void _rtl_rx_work(struct tasklet_struct *t).
>>
>> The initialization of rx_work_tasklet was still open-coded and the
>> function pointer just cast into the old type, and hence nothing sets
>> rx_work_tasklet.use_callback = true and the callback was still called as
>>
>>   t->func(t->data);
>>
>> with uninitialized/zero t->data.
>>
>> Commit 6b8c7574a5f8 changed the casting of _rtl_rx_work a bit and
>> initialized t->data to a pointer to the tasklet cast to an unsigned
>> long.
>>
>> This way calling t->func(t->data) might actually work through all the
>> casting, but it still doesn't update the code to use the new tasklet
>> API.
>>
>> Let's use the new tasklet_setup to initialize rx_work_tasklet properly
>> and set rx_work_tasklet.use_callback = true so that the callback is
>> called as
>>
>>   t->callback(t);
>>
>> without all the casting.
>>
>> Fixes: 6b8c7574a5f8 ("rtlwifi: fix build warning")
>> Fixes: d3ccc14dfe95 ("rtlwifi/rtw88: convert tasklets to use new
>> tasklet_setup() API")
>> Signed-off-by: Emil Renner Berthing <kernel@...il.dk>
>
> Since the current code works, this could target net-next

This should go to wireless-drivers-next, not net-next.

> without Fixes tags.

Correct, no need for Fixes tag as there's no bug to fix. This is only
cleanup AFAICS.

-- 
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