From mboxrd@z Thu Jan  1 00:00:00 1970
From: Cornelia Huck <cornelia.huck@de.ibm.com>
Subject: Re: [PATCH v4 09/42] virtio: set FEATURES_OK
Date: Tue, 25 Nov 2014 18:48:11 +0100
Message-ID: <20141125184811.3191f8db.cornelia.huck@de.ibm.com>
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: rusty@au1.ibm.com, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, pbonzini@redhat.com, David Miller <davem@davemloft.net>
List-Id: linux-api@vger.kernel.org

On Tue, 25 Nov 2014 18:42:01 +0200
"Michael S. Tsirkin" <mst@redhat.com> wrote:

> set FEATURES_OK as per virtio 1.0 spec
> 
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> ---
>  include/uapi/linux/virtio_config.h |  2 ++
>  drivers/virtio/virtio.c            | 29 ++++++++++++++++++++++-------
>  2 files changed, 24 insertions(+), 7 deletions(-)
> 

> +	if (virtio_has_feature(dev, VIRTIO_F_VERSION_1)) {
> +		add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK);
> +		status = dev->config->get_status(dev);
> +		if (!(status & VIRTIO_CONFIG_S_FEATURES_OK)) {
> +			printk(KERN_ERR "virtio: device refuses features: %x\n",
> +			       status);

Can you use dev_err() to include the information which device failed?

> +			err = -ENODEV;
> +			goto err;
> +		}
> +	}