commit ee877b81c6b92c190e7186c1ffd054804b426c02
author Sebastian Ott <sebott@linux.vnet.ibm.com> Fri Aug 19 09:12:09 2016 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> Thu Sep 22 13:42:32 2016 +0200
tree 9dea5cf1a3e6a6f01c23f524023e55490d91e816
parent 8cb63b78791eef67ea95831c6ef5e6039c572b14

s390/pci_dma: improve map_sg

Our map_sg implementation mapped sg entries independently of each other.
For ease of use and possible performance improvements this patch changes
the implementation to try to map as many (likely physically non-contiguous)
sglist entries as possible into a contiguous DMA segment.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>