netdev - Re: [PATCH] wifi: wfx: Remove some dead code

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Date:   Wed, 15 Feb 2023 14:23:56 +0100
From:   Jérôme Pouiller <jerome.pouiller@...abs.com>
To:     Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] wifi: wfx: Remove some dead code

Hello Christophe,

On Wednesday 15 February 2023 13:34:37 CET Christophe JAILLET wrote:
> 
> wait_for_completion_timeout() can not return a <0 value.
> So simplify the logic and remove dead code.
> 
> -ERESTARTSYS can not be returned by do_wait_for_common() for tasks with
> TASK_UNINTERRUPTIBLE, which is the case for wait_for_completion_timeout()
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>  drivers/net/wireless/silabs/wfx/main.c | 10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/wireless/silabs/wfx/main.c b/drivers/net/wireless/silabs/wfx/main.c
> index 6b9864e478ac..0b50f7058bbb 100644
> --- a/drivers/net/wireless/silabs/wfx/main.c
> +++ b/drivers/net/wireless/silabs/wfx/main.c
> @@ -358,13 +358,9 @@ int wfx_probe(struct wfx_dev *wdev)
> 
>         wfx_bh_poll_irq(wdev);
>         err = wait_for_completion_timeout(&wdev->firmware_ready, 1 * HZ);
> -       if (err <= 0) {
> -               if (err == 0) {
> -                       dev_err(wdev->dev, "timeout while waiting for startup indication\n");
> -                       err = -ETIMEDOUT;
> -               } else if (err == -ERESTARTSYS) {
> -                       dev_info(wdev->dev, "probe interrupted by user\n");

This code is ran during modprobe/insmod. We would like to allow the user
to interrupt (Ctrl+C) the probing if something is going wrong with the
device.

So, the real issue is wait_for_completion_interruptible_timeout() should
be used instead of wait_for_completion_timeout().

(By reading this code again, it also seems the test "if (err <= 0)" is
useless)


-- 
Jérôme Pouiller