[PATCH] drm/ttm: fix delayed ttm_bo_cleanup_refs_and_unlock delayed handling

[Markus Trippelsdorf]

On 2012.12.19 at 09:47 -0500, Alex Deucher wrote:
> On Wed, Dec 19, 2012 at 9:41 AM, Paul Menzel
> <paulepanter at users.sourceforge.net> wrote:
> > Am Mittwoch, den 19.12.2012, 15:18 +0100 schrieb Maarten Lankhorst:
> >> Fix regression introduced by 85b144f860176
> >
> > Thanks for the catch and patch.
> >
> > Also please add the commit summary to make the commit message self
> > contained?
> >
> > The problem description would also be nice.
> >
> >> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at canonical.com>
> >> Reported-by: Markus Trippelsdorf <markus at trippelsdorf.de>
> > Message-ID: <20121217182752.GA351 at x4>
> >
> >> ---
> >>
> >> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> >> index 0bf66f9..9f85418 100644
> >> --- a/drivers/gpu/drm/ttm/ttm_bo.c
> >> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> >> @@ -579,7 +579,7 @@ static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,
> >>                * at this point the buffer should be dead, so
> >>                * no new sync objects can be attached.
> >>                */
> >> -             sync_obj = driver->sync_obj_ref(&bo->sync_obj);
> >> +             sync_obj = driver->sync_obj_ref(bo->sync_obj);
> >
> > Any idea, why this only had an impact for one person so far?
> 
> There are several radeon bugs from drm-next 3.8 that may be ultimately
> related to this.

This patch fixes the kernel BUG, but now I get these errors in my
Xorg.log:

[    23.092] [mi] Increasing EQ size to 512 to prevent dropped events.
(EE) [mi] EQ overflowing.  Additional events will be discarded until existing events are processed.
(EE)
(EE) Backtrace:
(EE) 0: /usr/bin/X (xorg_backtrace+0x3d) [0x584f1d]
(EE) 1: /usr/bin/X (mieqEnqueue+0x21b) [0x56615b]
(EE) 2: /usr/bin/X (QueuePointerEvents+0x52) [0x44a792]
(EE) 3: /usr/bin/X (xf86PostButtonEvent+0xd5) [0x4829b5]
(EE) 4: /usr/lib64/xorg/modules/input/mouse_drv.so (0x7ff8f2501000+0x6b70) [0x7ff8f2507b70]
(EE) 5: /usr/lib64/xorg/modules/input/mouse_drv.so (0x7ff8f2501000+0x73a0) [0x7ff8f25083a0]
(EE) 6: /usr/lib64/xorg/modules/input/mouse_drv.so (0x7ff8f2501000+0x428c) [0x7ff8f250528c]
(EE) 7: /usr/bin/X (0x400000+0x71cd8) [0x471cd8]
(EE) 8: /usr/bin/X (0x400000+0x9a2ab) [0x49a2ab]
(EE) 9: /lib/libpthread.so.0 (0x7ff8f1edc000+0xf260) [0x7ff8f1eeb260]
(EE) 10: /lib/libc.so.6 (ioctl+0x7) [0x7ff8f19bd127]
(EE) 11: /usr/lib/libdrm.so.2 (drmIoctl+0x34) [0x7ff8f246a634]
(EE) 12: /usr/lib/libdrm.so.2 (drmCommandWriteRead+0x1f) [0x7ff8f246cbdf]
(EE) 13: /usr/lib/libdrm_radeon.so.1 (0x7ff8f250e000+0x27bf) [0x7ff8f25107bf]
(EE) 14: /usr/lib64/xorg/modules/drivers/radeon_drv.so (0x7ff8f154f000+0x407ec) [0x7ff8f158f7ec]
(EE) 15: /usr/bin/X (_CallCallbacks+0x34) [0x438894]
(EE) 16: /usr/bin/X (FlushAllOutput+0x2c) [0x5880ec]
(EE) 17: /usr/bin/X (0x400000+0x33aa1) [0x433aa1]
(EE) 18: /usr/bin/X (0x400000+0x230cd) [0x4230cd]
(EE) 19: /lib/libc.so.6 (__libc_start_main+0xf5) [0x7ff8f19088b5]
(EE) 20: /usr/bin/X (0x400000+0x22c09) [0x422c09]
(EE)
(EE) [mi] These backtraces from mieqEnqueue may point to a culprit higher up the stack.
(EE) [mi] mieq is *NOT* the cause.  It is a victim.
(EE) [mi] EQ overflow continuing.  100 events have been dropped.
(EE)
(EE) Backtrace:
(EE) 0: /usr/bin/X (xorg_backtrace+0x3d) [0x584f1d]
(EE) 1: /usr/bin/X (QueuePointerEvents+0x52) [0x44a792]
(EE) 2: /usr/bin/X (xf86PostButtonEvent+0xd5) [0x4829b5]
(EE) 3: /usr/lib64/xorg/modules/input/mouse_drv.so (0x7ff8f2501000+0x6b70) [0x7ff8f2507b70]
(EE) 4: /usr/lib64/xorg/modules/input/mouse_drv.so (0x7ff8f2501000+0x73a0) [0x7ff8f25083a0]
(EE) 5: /usr/lib64/xorg/modules/input/mouse_drv.so (0x7ff8f2501000+0x428c) [0x7ff8f250528c]
(EE) 6: /usr/bin/X (0x400000+0x71cd8) [0x471cd8]
(EE) 7: /usr/bin/X (0x400000+0x9a2ab) [0x49a2ab]
(EE) 8: /lib/libpthread.so.0 (0x7ff8f1edc000+0xf260) [0x7ff8f1eeb260]
(EE) 9: /lib/libc.so.6 (ioctl+0x7) [0x7ff8f19bd127]
(EE) 10: /usr/lib/libdrm.so.2 (drmIoctl+0x34) [0x7ff8f246a634]
(EE) 11: /usr/lib/libdrm.so.2 (drmCommandWriteRead+0x1f) [0x7ff8f246cbdf]
(EE) 12: /usr/lib/libdrm_radeon.so.1 (0x7ff8f250e000+0x27bf) [0x7ff8f25107bf]
(EE) 13: /usr/lib64/xorg/modules/drivers/radeon_drv.so (0x7ff8f154f000+0x407ec) [0x7ff8f158f7ec]
(EE) 14: /usr/bin/X (_CallCallbacks+0x34) [0x438894]
(EE) 15: /usr/bin/X (FlushAllOutput+0x2c) [0x5880ec]
(EE) 16: /usr/bin/X (0x400000+0x33aa1) [0x433aa1]
(EE) 17: /usr/bin/X (0x400000+0x230cd) [0x4230cd]
(EE) 18: /lib/libc.so.6 (__libc_start_main+0xf5) [0x7ff8f19088b5]
(EE) 19: /usr/bin/X (0x400000+0x22c09) [0x422c09]
(EE)
(EE) [mi] EQ overflow continuing.  200 events have been dropped.

And the pictures get distorted on the test-webpage when I scroll up and
down, see:
http://trippelsdorf.de/bad.png

-- 
Markus