From: Christoph Hellwig <hch@lst.de>
Date: Sat, 3 Oct 2015 17:16:07 +0000 (+0200)
Subject: 3w-9xxx: don't unmap bounce buffered commands
X-Git-Tag: v3.2.73~34
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=677ee63365fecb0d15df00fc6bd282b0ced7eaef;p=pandora-kernel.git

3w-9xxx: don't unmap bounce buffered commands

commit 15e3d5a285ab9283136dba34bbf72886d9146706 upstream.

3w controller don't dma map small single SGL entry commands but instead
bounce buffer them.  Add a helper to identify these commands and don't
call scsi_dma_unmap for them.

Based on an earlier patch from James Bottomley.

Fixes: 118c85 ("3w-9xxx: fix command completion race")
Reported-by: Tóth Attila <atoth@atoth.sote.hu>
Tested-by: Tóth Attila <atoth@atoth.sote.hu>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Adam Radford <aradford@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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