linux-kernel - [ 033/120] net: ethernet: davinci_cpdma: decrease the desc count when cleaning up the remaining packets

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Message-Id: <20121011005831.616979391@linuxfoundation.org>
Date:	Thu, 11 Oct 2012 09:59:45 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Tao Hou <hotforest@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 033/120] net: ethernet: davinci_cpdma: decrease the desc count when cleaning up the remaining packets

3.4-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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/ti/davinci_cpdma.c |    1 +
 1 file changed, 1 insertion(+)

--- 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 *c
 
 		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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