Regression: drm: Lobotomize set_busid nonsense for !pci drivers (a325725633c2)

[Gerd Hoffmann]

On Mi, 2016-10-05 at 12:30 +0200, Daniel Vetter wrote:
> On Wed, Oct 05, 2016 at 08:34:57AM +0200, Gerd Hoffmann wrote:
> > On Di, 2016-10-04 at 09:43 +0200, Gerd Hoffmann wrote:
> > >   Hi,
> > > 
> > > > diff --git a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
> > > > b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
> > > > index a59d0e309bfc..1fcf739bf509 100644
> > > > --- a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
> > > > +++ b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
> > > > @@ -68,6 +68,10 @@ int drm_virtio_init(struct drm_driver *driver,
> > > > struct virtio_device *vdev)
> > > >                 dev->pdev = pdev;
> > > >                 if (vga)
> > > >                         virtio_pci_kick_out_firmware_fb(pdev);
> > > > +
> > > > +               ret = drm_dev_set_unique(dev, dev_name(dev->pdev));
> > > > +               if (ret)
> > > > +                       goto err_free;
> > > >         }
> > > 
> > > Approach looks sensible to me, I'll give it a try ...
> > 
> > Well, dev_name() returns a string without the "pci:" prefix, we have to
> > add that to make things actually work, like this:
> 
> Hm right, I missed that in digging through the piles of layers of struct
> device naming.
> 
> > 
> > --- a/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
> > +++ b/drivers/gpu/drm/virtio/virtgpu_drm_bus.c
> > @@ -60,13 +60,22 @@ int drm_virtio_init(struct drm_driver *driver,
> > struct virtio_device *vdev)
> >  
> >         if (strcmp(vdev->dev.parent->bus->name, "pci") == 0) {
> >                 struct pci_dev *pdev = to_pci_dev(vdev->dev.parent);
> > +               const char *pname = dev_name(&pdev->dev);
> >                 bool vga = (pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA;
> > +               char unique[20];
> 
> Iirc we kfree this on unload. Needs to be a kasprintf I think.

drm_dev_set_unique() does this:

dev->unique = kstrdup(name, GFP_KERNEL);

So it should not matter at all where the caller stores name.
Or do you mean something else?

cheers,
  Gerd