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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