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authorFrancisco Jerez <currojerez@riseup.net>2010-09-21 02:15:15 +0200
committerDave Airlie <airlied@redhat.com>2010-09-22 12:40:38 +1000
commit0fbecd400dd0a82d465b3086f209681e8c54cb0f (patch)
tree05a45af49f8d0bc0619aa3453fa74568ffcbf78e /drivers/gpu
parent5222454cf941b09205d502242dd1e44fd62aa551 (diff)
drm/ttm: Clear the ghost cpu_writers flag on ttm_buffer_object_transfer.
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 <marcin.slusarz@gmail.com> Reviewed-by: Jerome Glisse <jglisse@redhat.com> Tested-by: Marcin Slusarz <marcin.slusarz@gmail.com> Signed-off-by: Francisco Jerez <currojerez@riseup.net> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/ttm/ttm_bo_util.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index 7cffb3e0423..3451a82adba 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -351,6 +351,7 @@ static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
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);
kref_init(&fbo->list_kref);