netdev - [PATCH 2/2] sky2: fix transmit state on resume

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Message-ID: <20070927123812.4e2185f3@freepuppy.rosehill>
Date:	Thu, 27 Sep 2007 12:38:12 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Jeff Garzik <jgarzik@...ox.com>
Cc:	netdev@...r.kernel.org
Subject: [PATCH 2/2] sky2: fix transmit state on resume

This should fix http://bugzilla.kernel.org/show_bug.cgi?id=8667

After resume, driver has reset the chip so the current state
of transmit checksum offload state machine and DMA state machine
will be undefined.

The fix is to set the state so that first Tx will set MSS and offset
values.

Patch is against 2.6.23-rc8 after last patch:
 sky2: FE+ vlan workaround

(Should also work on older releases with minor fuzz).

Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>

--- a/drivers/net/sky2.c	2007-09-27 08:45:13.000000000 -0700
+++ b/drivers/net/sky2.c	2007-09-27 09:39:49.000000000 -0700
@@ -910,6 +910,20 @@ static inline struct sky2_tx_le *get_tx_
 	return le;
 }
 
+static void tx_init(struct sky2_port *sky2)
+{
+	struct sky2_tx_le *le;
+
+	sky2->tx_prod = sky2->tx_cons = 0;
+	sky2->tx_tcpsum = 0;
+	sky2->tx_last_mss = 0;
+
+	le = get_tx_le(sky2);
+	le->addr = 0;
+	le->opcode = OP_ADDR64 | HW_OWNER;
+	sky2->tx_addr64 = 0;
+}
+
 static inline struct tx_ring_info *tx_le_re(struct sky2_port *sky2,
 					    struct sky2_tx_le *le)
 {
@@ -1320,7 +1334,8 @@ static int sky2_up(struct net_device *de
 				GFP_KERNEL);
 	if (!sky2->tx_ring)
 		goto err_out;
-	sky2->tx_prod = sky2->tx_cons = 0;
+
+	tx_init(sky2);
 
 	sky2->rx_le = pci_alloc_consistent(hw->pdev, RX_LE_BYTES,
 					   &sky2->rx_le_map);
-
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