linux-kernel - [PATCH 6/6] DCB: setting pg will cause tx unit hangs

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Message-ID: <20081014195605.16879.38567.stgit@gitlost.lost>
Date:	Tue, 14 Oct 2008 12:56:05 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net, jeff@...zik.org
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Subject: [PATCH 6/6] DCB: setting pg will cause tx unit hangs

From: Alexander Duyck <alexander.h.duyck@...el.com>

This patch fixes a hang in the ixgbe driver that occured when setting the Data Center Bridging (DCB) settings.

Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
---

 drivers/net/ixgbe/ixgbe_dcb_nl.c |   16 ++++++++++------
 1 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ixgbe/ixgbe_dcb_nl.c b/drivers/net/ixgbe/ixgbe_dcb_nl.c
index 51d162d..615c280 100644
--- a/drivers/net/ixgbe/ixgbe_dcb_nl.c
+++ b/drivers/net/ixgbe/ixgbe_dcb_nl.c
@@ -135,7 +135,7 @@ static void ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
 		if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
 			return;
 		} else {
-			if (netdev->flags & IFF_UP)
+			if (netif_running(netdev))
 				netdev->stop(netdev);
 			ixgbe_reset_interrupt_capability(adapter);
 			ixgbe_napi_del_all(adapter);
@@ -149,13 +149,13 @@ static void ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
 			adapter->flags |= IXGBE_FLAG_DCB_ENABLED;
 			ixgbe_init_interrupt_scheme(adapter);
 			ixgbe_napi_add_all(adapter);
-			if (netdev->flags & IFF_UP)
+			if (netif_running(netdev))
 				netdev->open(netdev);
 		}
 	} else {
 		/* Turn off DCB */
 		if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
-			if (netdev->flags & IFF_UP)
+			if (netif_running(netdev))
 				netdev->stop(netdev);
 			ixgbe_reset_interrupt_capability(adapter);
 			ixgbe_napi_del_all(adapter);
@@ -169,7 +169,7 @@ static void ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
 			adapter->flags |= IXGBE_FLAG_RSS_ENABLED;
 			ixgbe_init_interrupt_scheme(adapter);
 			ixgbe_napi_add_all(adapter);
-			if (netdev->flags & IFF_UP)
+			if (netif_running(netdev))
 				netdev->open(netdev);
 		} else {
 			return;
@@ -338,6 +338,9 @@ static u8 ixgbe_dcbnl_set_all(struct net_device *netdev)
 	while (test_and_set_bit(__IXGBE_RESETTING, &adapter->state))
 		msleep(1);
 
+	if (netif_running(netdev))
+		ixgbe_down(adapter);
+
 	ret = ixgbe_copy_dcb_cfg(&adapter->temp_dcb_cfg, &adapter->dcb_cfg,
 				 adapter->ring_feature[RING_F_DCB].indices);
 	if (ret) {
@@ -345,8 +348,9 @@ static u8 ixgbe_dcbnl_set_all(struct net_device *netdev)
 		return ret;
 	}
 
-	ixgbe_down(adapter);
-	ixgbe_up(adapter);
+	if (netif_running(netdev))
+		ixgbe_up(adapter);
+
 	adapter->dcb_set_bitmap = 0x00;
 	clear_bit(__IXGBE_RESETTING, &adapter->state);
 	return ret;

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