radeon_cp_texture: page fault with non-sleepable locks held

[Andriy Gapon]

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?

-- 
Andriy Gapon