linux-kernel - Re: [PATCH] virtio_console: move early VQ enablement

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Date:	Mon, 20 Oct 2014 17:05:08 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, Thomas Graf <tgraf@...g.ch>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org
Subject: Re: [PATCH] virtio_console: move early VQ enablement

On Mon, Oct 20, 2014 at 03:58:49PM +0200, Cornelia Huck wrote:
> Commit f5866db6 (virtio_console: enable VQs early) tried to make
> sure that DRIVER_OK was set when virtio_console started using its
> virtqueues. Doing this in add_port(), however, means that we try
> to set DRIVER_OK again when when a port is dynamically added after
> the probe function is done.
> 
> Let's move virtio_device_ready() to the probe function just before
> trying to use the virtqueues instead. This is fine as nothing can
> fail inbetween.
> 
> Reported-by: Thomas Graf <tgraf@...g.ch>
> Reviewed-by: Michael S. Tsirkin <mst@...hat.com>
> Signed-off-by: Cornelia Huck <cornelia.huck@...ibm.com>

Thanks!

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


> ---
>  drivers/char/virtio_console.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
> index bfa6400..cf7a561 100644
> --- a/drivers/char/virtio_console.c
> +++ b/drivers/char/virtio_console.c
> @@ -1449,8 +1449,6 @@ static int add_port(struct ports_device *portdev, u32 id)
>  	spin_lock_init(&port->outvq_lock);
>  	init_waitqueue_head(&port->waitqueue);
>  
> -	virtio_device_ready(portdev->vdev);
> -
>  	/* Fill the in_vq with buffers so the host can send us data. */
>  	nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock);
>  	if (!nr_added_bufs) {
> @@ -2026,6 +2024,8 @@ static int virtcons_probe(struct virtio_device *vdev)
>  	spin_lock_init(&portdev->ports_lock);
>  	INIT_LIST_HEAD(&portdev->ports);
>  
> +	virtio_device_ready(portdev->vdev);
> +
>  	if (multiport) {
>  		unsigned int nr_added_bufs;
>  
> -- 
> 1.8.5.5
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