Re: [PATCH] drm: virtio: reinstate drm_virtio_set_busid()

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Mon, Oct 17, 2016 at 11:10:28PM +0200, Laszlo Ersek wrote:
> Greg,
> 
> On 10/03/16 19:43, Laszlo Ersek wrote:
> > Before commit a325725633c2 ("drm: Lobotomize set_busid nonsense for !pci
> > drivers"), several DRM drivers for platform devices used to expose an
> > explicit "drm_driver.set_busid" callback, invariably backed by
> > drm_platform_set_busid().
> > 
> > Commit a325725633c2 removed drm_platform_set_busid(), along with the
> > referring .set_busid field initializations. This was justified because
> > interchangeable functionality had been implemented in drm_dev_alloc() /
> > drm_dev_init(), which DRM_IOCTL_SET_VERSION would rely on going forward.
> > 
> > However, commit a325725633c2 also removed drm_virtio_set_busid(), for
> > which the same consolidation was not appropriate: this .set_busid callback
> > had been implemented with drm_pci_set_busid(), and not
> > drm_platform_set_busid(). The error regressed Xorg/xserver on QEMU's
> > "virtio-vga" card; the drmGetBusid() function from libdrm would no longer
> > return stable PCI identifiers like "pci:0000:00:02.0", but rather unstable
> > platform ones like "virtio0".
> > 
> > Reinstate drm_virtio_set_busid() with judicious use of
> > 
> >   git checkout -p a325725633c2^ -- drivers/gpu/drm/virtio
> > 
> > Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> > Cc: Daniel Vetter <daniel.vetter@intel.com>
> > Cc: David Airlie <airlied@redhat.com>
> > Cc: Emil Velikov <emil.l.velikov@gmail.com>
> > Cc: Gerd Hoffmann <kraxel@redhat.com>
> > Cc: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
> > Cc: Hans de Goede <hdegoede@redhat.com>
> > Cc: Joachim Frieben <jfrieben@hotmail.com>
> > Cc: stable@vger.kernel.org
> > Reported-by: Joachim Frieben <jfrieben@hotmail.com>
> > Fixes: a325725633c26aa66ab940f762a6b0778edf76c0
> > Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1366842
> > Signed-off-by: Laszlo Ersek <lersek@redhat.com>
> > Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
> > ---
> >  drivers/gpu/drm/virtio/virtgpu_drm_bus.c | 10 ++++++++++
> >  drivers/gpu/drm/virtio/virtgpu_drv.c     |  1 +
> >  drivers/gpu/drm/virtio/virtgpu_drv.h     |  1 +
> >  3 files changed, 12 insertions(+)
> 
> Is there any particular reason this patch hasn't been cherry-picked to
> linux-4.8.y? (I checked v4.8.2.)

Yes, it just showed up in 4.9-rc1 3 days ago, give me a chance to catch
up!  I have 210 patches right now that are in this same status, you are
in good company.

Don't worry, it will eventually make it in, patience please...

greg k-h