netdev - Re: [Bugme-new] [Bug 12969] New: WARNING: at lib/dma-debug.c:539 check

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Date:	Mon, 6 Apr 2009 21:52:27 +0200
From:	Michael Buesch <mb@...sch.de>
To:	"Gary Zambrano" <zambrano@...adcom.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [Bugme-new] [Bug 12969] New: WARNING: at lib/dma-debug.c:539 check_sync+0xe9/0x341() (Not tainted)

Subject: [PATCH] b44: Use kernel DMA addresses for the kernel DMA API

We must not use the device DMA addresses for the kernel DMA API, because
device DMA addresses have an additional offset added for the SSB translation.

Use the original dma_addr_t for the sync operation.

Cc: stable@...nel.org
Signed-off-by: Michael Buesch <mb@...sch.de>

---

I could reproduce the bug on my b44 card and this patch fixes it.
Please apply the patch and close the bug. Thanks.


Index: linux-2.6/drivers/net/b44.c
===================================================================
--- linux-2.6.orig/drivers/net/b44.c	2009-04-06 21:47:55.000000000 +0200
+++ linux-2.6/drivers/net/b44.c	2009-04-06 21:50:18.000000000 +0200
@@ -750,7 +750,7 @@
 					     dest_idx * sizeof(*dest_desc),
 					     DMA_BIDIRECTIONAL);
 
-	ssb_dma_sync_single_for_device(bp->sdev, le32_to_cpu(src_desc->addr),
+	ssb_dma_sync_single_for_device(bp->sdev, dest_map->mapping,
 				       RX_PKT_BUF_SZ,
 				       DMA_FROM_DEVICE);
 }


-- 
Greetings, Michael.
--
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