From 26aa1c6949dfef77d3aa77e4cb504ccfd8394ce9 Mon Sep 17 00:00:00 2001
From: Lior Amsalem <alior@marvell.com>
Date: Tue, 26 May 2015 15:07:32 +0200
Subject: [PATCH] dmaengine: mv_xor: bug fix for racing condition in
 descriptors cleanup

commit 9136291f1dbc1d4d1cacd2840fb35f4f3ce16c46 upstream.

This patch fixes a bug in the XOR driver where the cleanup function can be
called and free descriptors that never been processed by the engine (which
result in data errors).

The cleanup function will free descriptors based on the ownership bit in
the descriptors.

Fixes: ff7b04796d98 ("dmaengine: DMA engine driver for Marvell XOR engine")
Signed-off-by: Lior Amsalem <alior@marvell.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Ofer Heifetz <oferh@marvell.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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