On Thu, Feb 11, 2021 at 01:28:41PM +0000, David Laight wrote:
> > Stack allocated buffers cannot be used for DMA
> > on all architectures so allocate hci_packet buffer
> > using kmalloc.
> 
> I wonder if the usb stack ought/could support a short bounce
> buffer within the memory is already has to allocate?

No.
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