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The following case can happen when two thread try to activate and deactivate a pad at the same time: T1: starts to deactivate, calls pre_activate(), sets in_activation to TRUE and carries on T2: starts to activate, calls pre_activate(), in_activation is TRUE so it waits on the GCond T1: calls post_activate(), tries to acquire the streaming lock .. but can't because T2 is currently holding it With this patch, the deadlock will no longer happen but does not solve the problem that: T2: will resume activation of the pad, set the pad mode to the target one (PUSH or PULL) and eventually the streaming lock gets released. T1: is able to finish calling post_activate() ... but ... the pad wasn't deactivated (T2 was the last one to "activate" the pad. https://bugzilla.gnome.org/show_bug.cgi?id=792341
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