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macb: restore wrap bit when performing underrun cleanup 

When TX underrun occurs, a cleanup is performed that marks all buffers
as used. As a side effect it also clears the wrap bit in the last
buffer. This patch will restore the wrap bit.

Signed-off-by: Tord Andersson <tord.andersson@endian.se>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tord Andersson 2011-08-03 22:11:47 +00:00 committed by David S. Miller
parent 36c35416a9
commit d3e6145771
1 changed files with 3 additions and 0 deletions
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3
drivers/net/macb.c
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@ -322,6 +322,9 @@ static void macb_tx(struct macb *bp)
for (i = 0; i < TX_RING_SIZE; i++)
bp->tx_ring[i].ctrl = MACB_BIT(TX_USED);
/* Add wrap bit */
bp->tx_ring[TX_RING_SIZE - 1].ctrl |= MACB_BIT(TX_WRAP);
/* free transmit buffer in upper layer*/
for (tail = bp->tx_tail; tail != head; tail = NEXT_TX(tail)) {
struct ring_info *rp = &bp->tx_skb[tail];