From b7f758659265c173380b792862aaad1c23c0e004 Mon Sep 17 00:00:00 2001
From: Russell King - ARM Linux <linux@arm.linux.org.uk>
Date: Mon, 3 Jan 2011 22:46:17 +0000
Subject: [PATCH] ARM: PL08x: prevent dma_set_runtime_config() reconfiguring
 memcpy channels

Prevent dma_set_runtime_config() being used to alter the configuration
supplied by the platform for memcpy channel configuration.  No one
should be trying to change this configuration.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 drivers/dma/amba-pl08x.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index c7f7b82f6155..bebc678ed4fc 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -1129,6 +1129,9 @@ static int dma_set_runtime_config(struct dma_chan *chan,
 	u32 cctl = 0;
 	int i;
 
+	if (!plchan->slave)
+		return -EINVAL;
+
 	/* Transfer direction */
 	plchan->runtime_direction = config->direction;
 	if (config->direction == DMA_TO_DEVICE) {
-- 
2.20.1