linux-kernel - Re: [PATCH] gpio: virtio: remove timeout

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Date:   Mon, 20 Dec 2021 10:35:43 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Vincent Whitchurch <vincent.whitchurch@...s.com>
Cc:     "Enrico Weigelt, metux IT consult" <info@...ux.net>,
        Viresh Kumar <vireshk@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>, kernel@...s.com,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-gpio@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio: virtio: remove timeout

On Mon, Dec 20, 2021 at 02:06:56PM +0100, Vincent Whitchurch wrote:
> The driver imposes an arbitrary one second timeout on virtio requests,
> but the specification doesn't prevent the virtio device from taking
> longer to process requests, so remove this timeout to support all
> systems and device implementations.
> 
> Fixes: 3a29355a22c0275fe86 ("gpio: Add virtio-gpio driver")
> Signed-off-by: Vincent Whitchurch <vincent.whitchurch@...s.com>

Acked-by: Michael S. Tsirkin <mst@...hat.com>

> ---
>  drivers/gpio/gpio-virtio.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-virtio.c b/drivers/gpio/gpio-virtio.c
> index 84f96b78f32a..9f4941bc5760 100644
> --- a/drivers/gpio/gpio-virtio.c
> +++ b/drivers/gpio/gpio-virtio.c
> @@ -100,11 +100,7 @@ static int _virtio_gpio_req(struct virtio_gpio *vgpio, u16 type, u16 gpio,
>  	virtqueue_kick(vgpio->request_vq);
>  	mutex_unlock(&vgpio->lock);
>  
> -	if (!wait_for_completion_timeout(&line->completion, HZ)) {
> -		dev_err(dev, "GPIO operation timed out\n");
> -		ret = -ETIMEDOUT;
> -		goto out;
> -	}
> +	wait_for_completion(&line->completion);
>  
>  	if (unlikely(res->status != VIRTIO_GPIO_STATUS_OK)) {
>  		dev_err(dev, "GPIO request failed: %d\n", gpio);
> -- 
> 2.33.1