[alsa-devel] unload Audio drivers while playback stream is active case kernel crash

[Takashi Iwai]

At Fri, 9 Jan 2015 11:39:32 +0000,
Wang, Jiada (ESD) wrote:
> 
> Hi Community
> 
> 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
[snip]

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?


Takashi