On Wed, 27 Jul 2016 05:21:11 +0200, Vinod Koul wrote: > > On Tue, Jul 26, 2016 at 05:41:56AM +0000, Kuninori Morimoto wrote: > > > > Hi ALSA SoC > > > > My current headache is ALSA SoC's each modules (= Card/Codec/CPU/Platform) > > doesn't care about "unbind/rmmod". > > For example, if someone unbinded/rmmoded "Codec", Card or other modules > > doesn't know about it. Thus, user can continue to use this sound card, > > and kernel will be Oops. > > Are you sure about this? Have you tried removing a module? > > During card probe, asoc will hold a reference to the component. See the > calls to try_module_get(). This will prevent from unloading under normal > cases. For unloading the module, yes, it should have been prevented by managing the module refcount. However, unbinding can't be stopped by that. It's a known problem. Morimoto-san, do you see the issue really via module unloading, or is it only via unbinding? Takashi
