linux-kernel - [ 045/143] ll_temac: Reset dma descriptors indexes on ndo

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Message-Id: <20140512003202.504653342@1wt.eu>
Date:	Mon, 12 May 2014 02:32:45 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
	"David S. Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu>
Subject: [ 045/143] ll_temac: Reset dma descriptors indexes on ndo_open

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

From: Ricardo Ribalda <ricardo.ribalda@...il.com>

[ Upstream commit 7167cf0e8cd10287b7912b9ffcccd9616f382922 ]

The dma descriptors indexes are only initialized on the probe function.

If a packet is on the buffer when temac_stop is called, the dma
descriptors indexes can be left on a incorrect state where no other
package can be sent.

So an interface could be left in an usable state after ifdow/ifup.

This patch makes sure that the descriptors indexes are in a proper
status when the device is open.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/net/ll_temac_main.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ll_temac_main.c b/drivers/net/ll_temac_main.c
index f2a197f..d2516dd 100644
--- a/drivers/net/ll_temac_main.c
+++ b/drivers/net/ll_temac_main.c
@@ -190,6 +190,12 @@ static int temac_dma_bd_init(struct net_device *ndev)
 		       lp->rx_bd_p + (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1)));
 	temac_dma_out32(lp, TX_CURDESC_PTR, lp->tx_bd_p);
 
+	/* Init descriptor indexes */
+	lp->tx_bd_ci = 0;
+	lp->tx_bd_next = 0;
+	lp->tx_bd_tail = 0;
+	lp->rx_bd_ci = 0;
+
 	return 0;
 }
 
-- 
1.7.12.2.21.g234cd45.dirty



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