radeon_cp_texture: page fault with non-sleepable locks held

[Kostik Belousov]

On Mon, Nov 08, 2010 at 02:07:43PM +0200, Andriy Gapon wrote:
> on 08/11/2010 14:04 Kostik Belousov said the following:
> > On Mon, Nov 08, 2010 at 01:50:25PM +0200, Andriy Gapon wrote:
> >> on 05/11/2010 09:27 Andriy Gapon said the following:
> >>>
> >>> I use FreeSBD head and KDE 4 with all the bells and whistles enabled.
> >>> Apparently recent KDE update has enabled even more of them, because I started to
> >>> have panics with a kernel that has INVARIANTS and WITNESS enabled.
> >>
> >> I tried to solve the problem by changing drmdev from mutex to sx:
> >> http://people.freebsd.org/~avg/drm-sx.diff
> > I remember that drm lock can be acquired from the interrupt thread, if
> > the card supports interrupts. Changing it to sx cannot work then, because
> > interrupt threads cannot sleep. Most likely, you are getting around it
> > since r600 not yet used interrupts on FreeBSD.
> > 
> > I think the solution is to drop drm lock around copyin.
> 
> Kostik,
> 
> thanks a lot for the help!
> Are familiar enough with the code to tell if drmdev is always held at that
> place?  Or should I first check if it's actually owned and drop/reacquire it
> accordingly?
I think you can assume that the lock is always owned.
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