Hi J. Neuschäfer

Thank you for reporting, and sorry for my late response (I was in summer
vacation).

When booting the Allwinner H2+ SoC (Orange Pi Zero) with the audio codec
enabled, recent kernels crash with a NULL pointer dereference:

(snip)

This particular error path is taken after platform_probe returns -EPROBE_DEFER
to call_driver_probe and really_probe calls device_unbind_cleanup.

The parameters to the strcmp call in snd_soc_lookup_component_nolocked are
component->driver->name = NULL and driver_name = "snd_dmaengine_pcm".

Thanks.
I think it is...
	- snd_dmaengine_pcm is sharing same dev with CPU and Platform
	- Platform has driver->name (no problem)
	- CPU doesn't have driver->name (will be NULL pointer access)

I guess your CPU component doesn't have driver->name ?
Anyway, it should care about such case. I will post 2 patches (1st is for
fixup this issue, 2nd is cleanup patch).
Could you please test both patches ?

Thank you for your help !!

Best regards
---
Kuninori Morimoto