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SubjectRe: [PATCH 4/7] ALSA: pcm: use dma_can_mmap() to check if a device supports dma_mmap_*
On Mon, Aug 05, 2019 at 11:22:03AM +0200, Takashi Iwai wrote:
> This won't work as expected, unfortunately. It's a bit tricky check,
> since the driver may have its own mmap implementation via
> substream->ops->mmap, and the dma_buffer.dev.dev might point to
> another object depending on the dma_buffer.dev.type.
>
> So please replace with something like below:

From my gut feeling I'd reorder it a bit to make it more clear like
this:

http://git.infradead.org/users/hch/misc.git/commitdiff/958fccf54d00c16740522f818d23f9350498e911

if this is fine it'll be in the next version, waiting for a little more
feedback on the other patches.

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