linux-kernel - [PATCH] macb: restore wrap bit when performing underrun cleanup

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Message-Id: <1312445507-31382-1-git-send-email-tord.andersson@endian.se>
Date:	Thu,  4 Aug 2011 10:11:47 +0200
From:	Tord Andersson <tord.andersson@...ian.se>
To:	nicolas.ferre@...el.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tord Andersson <tord.andersson@...ian.se>
Subject: [PATCH] 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@...ian.se>
---
 drivers/net/macb.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index 0fcdc25..dc4e305 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -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];
-- 
1.5.4.3

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