linux-kernel - [PATCH corrected] firewire: fw-ohci: fix DMA mapping for ar context

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Message-ID: <tkrat.c21e564719351bc6@s5r6.in-berlin.de>
Date:	Tue, 16 Oct 2007 19:40:04 +0200 (CEST)
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux1394-devel@...ts.sourceforge.net
cc:	linux-kernel@...r.kernel.org,
	Kristian Høgsberg <krh@...hat.com>
Subject: [PATCH corrected] firewire: fw-ohci: fix DMA mapping for ar context

The CPU must not touch the buffer after it was DMA-mapped.

Signed-off-by: Stefan Richter <stefanr@...6.in-berlin.de>
---
 drivers/firewire/fw-ohci.c |    1 +
 1 file changed, 1 insertion(+)

Index: linux/drivers/firewire/fw-ohci.c
===================================================================
--- linux.orig/drivers/firewire/fw-ohci.c
+++ linux/drivers/firewire/fw-ohci.c
@@ -258,6 +258,7 @@ static int ar_context_add_page(struct ar
 		free_page((unsigned long) ab);
 		return -ENOMEM;
 	}
+	dma_sync_single_for_cpu(dev, ab_bus, PAGE_SIZE, DMA_BIDIRECTIONAL);
 
 	memset(&ab->descriptor, 0, sizeof(ab->descriptor));
 	ab->descriptor.control        = cpu_to_le16(DESCRIPTOR_INPUT_MORE |

-- 
Stefan Richter
-=====-=-=== =-=- =----
http://arcgraph.de/sr/

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