linux-kernel - [ 079/180] atl1: fix kernel panic in case of DMA errors

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Message-Id: <20121001225200.951589835@1wt.eu>
Date:	Tue, 02 Oct 2012 00:53:16 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Tony Zelenoff <antonz@...allels.com>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Willy Tarreau <w@....eu>
Subject: [ 079/180] atl1: fix kernel panic in case of DMA errors

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

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

From: Tony Zelenoff <antonz@...allels.com>

[ Upstream commit 03662e41c7cff64a776bfb1b3816de4be43de881 ]

Problem:
There was two separate work_struct structures which share one
handler. Unfortunately getting atl1_adapter structure from
work_struct in case of DMA error was done from incorrect
offset which cause kernel panics.

Solution:
The useless work_struct for DMA error removed and
handler name changed to more generic one.

Signed-off-by: Tony Zelenoff <antonz@...allels.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/net/atlx/atl1.c |   12 +++++-------
 drivers/net/atlx/atl1.h |    3 +--
 drivers/net/atlx/atlx.c |    2 +-
 3 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/drivers/net/atlx/atl1.c b/drivers/net/atlx/atl1.c
index 403bfb6..adc862f 100644
--- a/drivers/net/atlx/atl1.c
+++ b/drivers/net/atlx/atl1.c
@@ -2478,7 +2478,7 @@ static irqreturn_t atl1_intr(int irq, void *data)
 					"pcie phy link down %x\n", status);
 			if (netif_running(adapter->netdev)) {	/* reset MAC */
 				iowrite32(0, adapter->hw.hw_addr + REG_IMR);
-				schedule_work(&adapter->pcie_dma_to_rst_task);
+				schedule_work(&adapter->reset_dev_task);
 				return IRQ_HANDLED;
 			}
 		}
@@ -2490,7 +2490,7 @@ static irqreturn_t atl1_intr(int irq, void *data)
 					"pcie DMA r/w error (status = 0x%x)\n",
 					status);
 			iowrite32(0, adapter->hw.hw_addr + REG_IMR);
-			schedule_work(&adapter->pcie_dma_to_rst_task);
+			schedule_work(&adapter->reset_dev_task);
 			return IRQ_HANDLED;
 		}
 
@@ -2635,10 +2635,10 @@ static void atl1_down(struct atl1_adapter *adapter)
 	atl1_clean_rx_ring(adapter);
 }
 
-static void atl1_tx_timeout_task(struct work_struct *work)
+static void atl1_reset_dev_task(struct work_struct *work)
 {
 	struct atl1_adapter *adapter =
-		container_of(work, struct atl1_adapter, tx_timeout_task);
+		container_of(work, struct atl1_adapter, reset_dev_task);
 	struct net_device *netdev = adapter->netdev;
 
 	netif_device_detach(netdev);
@@ -3050,12 +3050,10 @@ static int __devinit atl1_probe(struct pci_dev *pdev,
 		    (unsigned long)adapter);
 	adapter->phy_timer_pending = false;
 
-	INIT_WORK(&adapter->tx_timeout_task, atl1_tx_timeout_task);
+	INIT_WORK(&adapter->reset_dev_task, atl1_reset_dev_task);
 
 	INIT_WORK(&adapter->link_chg_task, atlx_link_chg_task);
 
-	INIT_WORK(&adapter->pcie_dma_to_rst_task, atl1_tx_timeout_task);
-
 	err = register_netdev(netdev);
 	if (err)
 		goto err_common;
diff --git a/drivers/net/atlx/atl1.h b/drivers/net/atlx/atl1.h
index 146372f..0494e514 100644
--- a/drivers/net/atlx/atl1.h
+++ b/drivers/net/atlx/atl1.h
@@ -762,9 +762,8 @@ struct atl1_adapter {
 	u16 link_speed;
 	u16 link_duplex;
 	spinlock_t lock;
-	struct work_struct tx_timeout_task;
+	struct work_struct reset_dev_task;
 	struct work_struct link_chg_task;
-	struct work_struct pcie_dma_to_rst_task;
 
 	struct timer_list phy_config_timer;
 	bool phy_timer_pending;
diff --git a/drivers/net/atlx/atlx.c b/drivers/net/atlx/atlx.c
index 3dc0142..ce09b95 100644
--- a/drivers/net/atlx/atlx.c
+++ b/drivers/net/atlx/atlx.c
@@ -189,7 +189,7 @@ static void atlx_tx_timeout(struct net_device *netdev)
 {
 	struct atlx_adapter *adapter = netdev_priv(netdev);
 	/* Do the reset outside of interrupt context */
-	schedule_work(&adapter->tx_timeout_task);
+	schedule_work(&adapter->reset_dev_task);
 }
 
 /*
-- 
1.7.2.1.45.g54fbc



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