On Don, 2011-07-07 at 09:10 +1000, Ben Skeggs wrote:
> On Wed, 2011-07-06 at 09:38 +0200, Michel Dänzer wrote:
> > On Mon, 2011-07-04 at 13:16 +1000, skeggsb@xxxxxxxxx wrote:
> > > From: Ben Skeggs <bskeggs@xxxxxxxxxx>
> > >
> > > Signed-off-by: Ben Skeggs <bskeggs@xxxxxxxxxx>
> > > ---
> > > drivers/gpu/drm/drm_irq.c | 15 +++++++++------
> > > 1 files changed, 9 insertions(+), 6 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> > > index 2022a5c..c3c87a1 100644
> > > --- a/drivers/gpu/drm/drm_irq.c
> > > +++ b/drivers/gpu/drm/drm_irq.c
> > > @@ -397,13 +397,16 @@ int drm_irq_uninstall(struct drm_device *dev)
> > > /*
> > > * Wake up any waiters so they don't hang.
> > > */
> > > - spin_lock_irqsave(&dev->vbl_lock, irqflags);
> > > - for (i = 0; i < dev->num_crtcs; i++) {
> > > - DRM_WAKEUP(&dev->vbl_queue[i]);
> > > - dev->vblank_enabled[i] = 0;
> > > - dev->last_vblank[i] = dev->driver->get_vblank_counter(dev, i);
> > > + if (dev->num_crtcs) {
> > > + spin_lock_irqsave(&dev->vbl_lock, irqflags);
> > > + for (i = 0; i < dev->num_crtcs; i++) {
> > > + DRM_WAKEUP(&dev->vbl_queue[i]);
> > > + dev->vblank_enabled[i] = 0;
> > > + dev->last_vblank[i] =
> > > + dev->driver->get_vblank_counter(dev, i);
> > > + }
> > > + spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
> > > }
> > > - spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
> > >
> > > if (!irq_enabled)
> > > return -EINVAL;
> >
> > Makes sense, but according to commit
> > 7a1c2f6c8d8485af5ac6c2a313f6a7162207a4af ('vmwgfx: Enable use of the
> > vblank system'), the vblank ioctls will also access uninitialized data
> > if drm_vblank_init() hasn't been called. So, is this just for cases
> > where drm_irq_uninstall() is called before the driver gets a chance to
> > call drm_vblank_init()?
> Heh, ouch.
>
> Yes, it was specifically that case I was aiming for however. If
> nouveau's running on a board without any outputs, it won't call
> drm_vblank_init(), but it *will* call drm_irq_*. Just avoiding lockdep
> complaints on module unload.
I see.
Reviewed-by: Michel Dänzer <michel@xxxxxxxxxxx>
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Debian, X and DRI developer
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
http://lists.freedesktop.org/mailman/listinfo/dri-devel
