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

[Ben Hutchings]

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

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

From: htbegin <hotforest@xxxxxxxxx>

[ 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@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 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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