On 27 May 2015 at 20:04, Frediano Ziglio fziglio@redhat.com wrote:
qxl_bo structure has two reference counters, one in the GEM object and another in the TTM object. The GEM object keep a counter to the TTM object so when GEM counter reached zero the TTM counter (using qxl_bo_unref) was decremented. The qxl object is fully freed (both GEM and TTM part are cleaned) when the TTM counter reach zero. One issue was that surface idr structure has no owning on qxl_bo objects however it contains a pointer to qxl_bo object. This caused some nasty race condition for instance qxl_bo object was reaped even after counter was already zero. This patch fix these races moving main counter (the one used by qxl_bo_(un)ref) to GEM object which cleanup routine (qxl_gem_object_free) remove the idr pointer (using qxl_surface_evict) when the counters are still valid.
Uggh, but yes, not sure I like this fix for the problem, but if it works,
Reviewed-by: Dave Airlie airlied@redhat.com