This is a note to let you know that I've just added the patch titled
drm/ttm: Clear the ghost cpu_writers flag on ttm_buffer_object_transfer.
to the 2.6.32-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-ttm-clear-the-ghost-cpu_writers-flag-on-ttm_buffer_object_transfer.patch
and it can be found in the queue-2.6.32 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 0fbecd400dd0a82d465b3086f209681e8c54cb0f Mon Sep 17 00:00:00 2001
From: Francisco Jerez <[email protected]>
Date: Tue, 21 Sep 2010 02:15:15 +0200
Subject: drm/ttm: Clear the ghost cpu_writers flag on
ttm_buffer_object_transfer.
From: Francisco Jerez <[email protected]>
commit 0fbecd400dd0a82d465b3086f209681e8c54cb0f upstream.
It makes sense for a BO to move after a process has requested
exclusive RW access on it (e.g. because the BO used to be located in
unmappable VRAM and we intercepted the CPU access from the fault
handler).
If we let the ghost object inherit cpu_writers from the original
object, ttm_bo_release_list() will raise a kernel BUG when the ghost
object is destroyed. This can be reproduced with the nouveau driver on
nv5x.
Reported-by: Marcin Slusarz <[email protected]>
Reviewed-by: Jerome Glisse <[email protected]>
Tested-by: Marcin Slusarz <[email protected]>
Signed-off-by: Francisco Jerez <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/gpu/drm/ttm/ttm_bo_util.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -330,6 +330,7 @@ static int ttm_buffer_object_transfer(st
INIT_LIST_HEAD(&fbo->lru);
INIT_LIST_HEAD(&fbo->swap);
fbo->vm_node = NULL;
+ atomic_set(&fbo->cpu_writers, 0);
fbo->sync_obj = driver->sync_obj_ref(bo->sync_obj);
if (fbo->mem.mm_node)
Patches currently in stable-queue which might be from [email protected] are
queue-2.6.32/drm-ttm-clear-the-ghost-cpu_writers-flag-on-ttm_buffer_object_transfer.patch
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