[PATCH RESEND] dma-buf: heaps: Fix mutex lock area and generalize struct dma_heap_attachment

[Weizhao Ouyang]

Thanks for reply.

On 2022/1/4 02:45, John Stultz wrote:
> On Tue, Dec 28, 2021 at 11:09 PM Weizhao Ouyang <o451686892 at gmail.com> wrote:
>> Fix cma_heap_buffer mutex lock area to protect vmap_cnt and vaddr. And
>> move struct dma_heap_attachment to dma-heap.h so that vendor dma heaps
>> can use it, the same behaviour as struct dma_buf_attachment.
>>
> Hey!
>   Thanks for submitting this patch! Apologies for the slow reply (was
> out for the holidays).
>
> This patch is combining two changes in one patch, so they need to be
> split up. The locking change looks sane, but moving the
> dma_heap_attachment may need some extra justification as changing
> upstream code just to support out of tree code isn't usually done (if
> there was some benefit to the in-tree code, that would be fine
> though).
>
> I'd also be eager to try to get the vendor heap to be merged, assuming
> we can also merge an upstream user for it.
Yeap moving the dma_heap_attachment need more sufficient reason, and
it should add a private area to adapt vendor heap change if we move it
to in-tree code. So just drop the idea now :)

I will send a new patch to clarify the locking change later.

Thanks,
Weizhao