ALSA: pcm: use dma_can_mmap() to check if a device supports dma_mmap_*

[Greg Kroah-Hartman]

On 11/4/19 9:27 AM, youling 257 wrote:
 > This driver 
https://android.googlesource.com/kernel/common/+/refs/heads/android-mainline/drivers/usb/gadget/function/f_audio_source.c
 >

The driver is broken and needs to be fixed.  Please feel free to submit
patches to AOSP to do so as you can trigger this easily.

thanks,

greg k-h