linux-kernel - [ 084/108] net: ethernet: davinci_cpdma: decrease the desc count when cleaning up the remaining packets

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Message-Id: <20121007225846.316148456@decadent.org.uk>
Date:	Sun, 07 Oct 2012 23:59:58 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	htbegin <hotforest@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 084/108] net: ethernet: davinci_cpdma: decrease the desc count  when cleaning up the remaining packets

3.2-stable review patch.  If anyone has any objections, please let me know.

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

From: htbegin <hotforest@...il.com>

[ Upstream commit ffb5ba90017505a19e238e986e6d33f09e4df765 ]

chan->count is used by rx channel. If the desc count is not updated by
the clean up loop in cpdma_chan_stop, the value written to the rxfree
register in cpdma_chan_start will be incorrect.

Signed-off-by: Tao Hou <hotforest@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/ethernet/ti/davinci_cpdma.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/ti/davinci_cpdma.c b/drivers/net/ethernet/ti/davinci_cpdma.c
index c97d2f5..bfc3b0d 100644
--- a/drivers/net/ethernet/ti/davinci_cpdma.c
+++ b/drivers/net/ethernet/ti/davinci_cpdma.c
@@ -851,6 +851,7 @@ int cpdma_chan_stop(struct cpdma_chan *chan)
 
 		next_dma = desc_read(desc, hw_next);
 		chan->head = desc_from_phys(pool, next_dma);
+		chan->count--;
 		chan->stats.teardown_dequeue++;
 
 		/* issue callback without locks held */


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