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

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Message-ID: <CAF=yD-LGoVkf5ARHPsGAMbsruDq7iQ=X8c3cZRp5XaZC936EMw@mail.gmail.com>
Date:   Wed, 27 Jan 2021 09:47:08 -0500
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Emil Renner Berthing <kernel@...il.dk>
Cc:     linux-wireless <linux-wireless@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Ping-Ke Shih <pkshih@...ltek.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "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

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 without Fixes tags.

Acked-by: Willem de Bruijn <willemb@...gle.com>