direct rendering freeze

garrone pgarrone at
Thu Dec 11 03:54:45 PST 2008

On Thu, Dec 11, 2008 at 08:13:12PM +1000, Dave Airlie wrote:
> On Thu, Dec 11, 2008 at 4:56 PM, garrone <pgarrone at> wrote:
> >
> > Hi,
> >  I am getting freezes in direct rendering. Sometimes glxgears works,
> > but eventually the freeze occurs at program exit, or upon xrandr operation.
> >
> > The freeze occurs
> > because the kernel function drm_lock continually returns -EINTR
> > because the hardware lock variable master->lock.hw_lock is NULL,
> > and the function drmIoctl (in user space drm) continually invokes the ioctl
> > while it returns -EINTR.
> I need to look at this some more, but I can't figure out how the shm
> can find a matching map
> if there was a map created already, it should have gotten a lock
> allocated in it.
> I'll try and take a look asap.
> Dave.

Thanks. The condition happens after the drm devices are closed and
reopened. The map that is still there corresponds to the one generating
the mtrr message. Now that I know that the maps are supposed to be
cleared in that situation, I can find out why this one isn't.


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