linux-kernel - [047/103] dmaengine: fix interrupt clearing for mv

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Date:	Fri, 22 Oct 2010 11:51:21 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Simon Guinot <sguinot@...ie.com>,
	saeed bishara <saeed.bishara@...il.com>,
	Dan Williams <dan.j.williams@...el.com>
Subject: [047/103] dmaengine: fix interrupt clearing for mv_xor

2.6.35-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Simon Guinot <sguinot@...ie.com>

commit cc60f8878eab892c03d06b10f389232b9b66bd83 upstream.

When using simultaneously the two DMA channels on a same engine, some
transfers are never completed. For example, an endless lock can occur
while writing heavily on a RAID5 array (with async-tx offload support
enabled).

Note that this issue can also be reproduced by using the DMA test
client.

On a same engine, the interrupt cause register is shared between two
DMA channels. This patch make sure that the cause bit is only cleared
for the requested channel.

Signed-off-by: Simon Guinot <sguinot@...ie.com>
Tested-by: Luc Saillard <luc@...llard.org>
Acked-by: saeed bishara <saeed.bishara@...il.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/dma/mv_xor.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -162,7 +162,7 @@ static int mv_is_err_intr(u32 intr_cause
 
 static void mv_xor_device_clear_eoc_cause(struct mv_xor_chan *chan)
 {
-	u32 val = (1 << (1 + (chan->idx * 16)));
+	u32 val = ~(1 << (chan->idx * 16));
 	dev_dbg(chan->device->common.dev, "%s, val 0x%08x\n", __func__, val);
 	__raw_writel(val, XOR_INTR_CAUSE(chan));
 }


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