On Wed, Jul 27, 2016 at 07:57:05AM +0200, Takashi Iwai wrote: > 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. Oh yes, unload is an issue. Are these any solutions to prevent this? In core, should we de-register the card if one of the components exits. The .remove should be called for the driver, thus triggering unregister? -- ~Vinod
