This patch only unmap the actual completed DMA buffer instead of
the whole transfer buffer.
It is common to see only part of DMA transfer is completed, especially
in case of DMA_FROM_DEVICE because the length of incoming traffic often
is unknown before submitting URB, so this patch may improve USB
Hello.
On 27-05-2013 20:13, Ming Lei wrote:
This patch only unmap the actual completed DMA buffer instead of
the whole transfer buffer.
Who will unmap the rest of the buffer?
It is common to see only part of DMA transfer is completed, especially
in case of DMA_FROM_DEVICE because the le
