Re: [PATCH v4 09/42] virtio: set FEATURES_OK

[Cornelia Huck]

On Tue, 25 Nov 2014 23:38:23 +0200
"Michael S. Tsirkin" <mst@xxxxxxxxxx> wrote:

> On Tue, Nov 25, 2014 at 06:48:11PM +0100, Cornelia Huck wrote:
> > On Tue, 25 Nov 2014 18:42:01 +0200
> > "Michael S. Tsirkin" <mst@xxxxxxxxxx> wrote:
> > 
> > > set FEATURES_OK as per virtio 1.0 spec
> > > 
> > > Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> > > ---
> > >  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?
> 
> I'm not sure - is dev_err OK to use from probe?

The dev_* functions should be fine anytime, but the driver has already
been set before ->probe is called anyway.

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