tree 450791a25611cf98bde1540a3c366d0e2a6ba117
parent 6f633c8d69415aabbccfcc494008e8e1300a98c1
author Roland Dreier <rolandd@cisco.com> 1143244046 -0800
committer Roland Dreier <rolandd@cisco.com> 1143244046 -0800

IB/srp: Use a fake scatterlist for non-SG SCSI commands

Since the SCSI midlayer is moving towards entirely getting rid of
commands with use_sg == 0, we should treat this case as an exception.
Therefore, change the IB SRP initiator to create a fake scatterlist
for these commands with sg_init_one().  This simplifies the flow of
DMA mapping and unmapping, since SRP can just use dma_map_sg() and
dma_unmap_sg() unconditionally, rather than having to choose between
the dma_{map,unmap}_sg() and dma_{map,unmap}_single() variants.

Signed-off-by: Roland Dreier <rolandd@cisco.com>