On Tue, Jan 13, 2015 at 06:24:44PM +0100, Takashi Iwai wrote: > Wang, Jiada (ESD) wrote:
> > I am using i.MX6Q sabreSD board, which have imx_wm892 machine driver, > > wm8962 codec and SSI CPU DAI, > > I got Kernel crash when unloading audio drivers (playback stream is active) > > modprobe -r snd_soc_imx_wm8962 > > modprobe -r snd_soc_fsl_ssi > > modprobe -r snd_soc_wm8962 > The root problem is that you can unload the module while playing. > The corresponding module refcounts should have been increased during > used. > Do we miss [try_]module_get() somewhere in ASoC? That doesn't help, users can still forcibly unbind the driver at runtime without loading the module - and there's always the potential for actually hotpluggable hardware. The teardown paths should be able to cope somewhat gracefully.
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