From aa75679c797c0250a853e600e45368f1f9545c27 Mon Sep 17 00:00:00 2001
From: Alexei Potashnik <alexei@purestorage.com>
Date: Mon, 20 Jul 2015 17:12:12 -0700
Subject: [PATCH] target/iscsi: Use proper SGL accessors for digest computation

Current implementation assumes that all the buffers of an IO are linked
with a single SG list, which is OK because target-core is only allocating
a contigious scatterlist region.  However, this assumption is wrong for
se_cmd descriptors that want to use chaining across multiple SGL regions.

Fix this up by using proper SGL accessors for digest payload computation.

Signed-off-by: Alexei Potashnik <alexei@purestorage.com>
Cc: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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