net: ethernet: davinci_cpdma: decrease the desc count when cleaning up the remaining...

[ 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@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/ti/davinci_cpdma.c b/drivers/net/ethernet/ti/davinci_cpdma.c
index 3455876..06f2b49 100644 (file)
--- 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 */