Re: [PATCH v2] usb: cdns3: Optimize DMA request buffer allocation

[Peter Chen]

On 21-03-18 07:32:45, Christoph Hellwig wrote:
> On Wed, Mar 17, 2021 at 08:13:59PM +0100, Sanket Parmar wrote:
> > dma_alloc_coherent() might fail on the platform with a small
> > DMA region.
> > 
> > To avoid such failure in cdns3_prepare_aligned_request_buf(),
> > dma_alloc_coherent() is replaced with dma_alloc_noncoherent()
> > to allocate aligned request buffer of dynamic length.
> > 
> > Reported-by: Aswath Govindraju <a-govindraju@xxxxxx>
> > Signed-off-by: Sanket Parmar <sparmar@xxxxxxxxxxx>
> 
> Looks good to me:
> 
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>

Hi Christoph,

I would like to confirm the dma_alloc_noncoherent allocates the memory
less than PAGE_SIZE if buffer size it would like to allocate is small
(eg, 64 bytes)? 

-- 

Thanks,
Peter Chen