Commit b259b312 authored by Chris Wilson's avatar Chris Wilson Committed by Daniel Vetter
Browse files

drm/i915: fix invalid reference handling of the default ctx obj

Otherwise we end up trying to unpin a freed object and BUG.
Signed-off-by: default avatarChris Wilson <>
Reviewed-by: default avatarBen Widawsky <>
Signed-off-by: default avatarDaniel Vetter <>
parent eeef9b38
......@@ -419,8 +419,11 @@ static int do_switch(struct drm_i915_gem_object *from_obj,
from_obj->dirty = 1;
BUG_ON(from_obj->ring != to->ring);
ring->last_context_obj = to->obj;
to->is_initialized = true;
......@@ -470,20 +473,7 @@ int i915_switch_context(struct intel_ring_buffer *ring,
if (from_obj == to->obj)
return 0;
ret = do_switch(from_obj, to, i915_gem_next_request_seqno(to->ring));
if (ret)
return ret;
/* Just to make the code a little cleaner we take the object reference
* after the switch was successful. It would be more intuitive to ref
* the 'to' object before the switch but we know the refcount must be >0
* if context_get() succeeded, and we hold struct mutex. So it's safe to
* do this here/now
if (from_obj != NULL)
return ret;
return do_switch(from_obj, to, i915_gem_next_request_seqno(to->ring));
int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
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