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

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