skge: race with workq and RTNL
If a workqueue function that needs RTNL is running when skge_down is called then a deadlock is possible. Fix by only clearing the timer, and handling the flush_scheduled_work on removal. This work queue is only ever used for the old fiber based boards. Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>
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@ -1419,7 +1419,8 @@ static void xm_link_timer(struct work_struct *work)
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mutex_unlock(&hw->phy_mutex);
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nochange:
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schedule_delayed_work(&skge->link_thread, LINK_HZ);
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if (netif_running(dev))
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schedule_delayed_work(&skge->link_thread, LINK_HZ);
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}
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static void genesis_mac_init(struct skge_hw *hw, int port)
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@ -2530,7 +2531,7 @@ static int skge_down(struct net_device *dev)
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netif_stop_queue(dev);
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if (hw->chip_id == CHIP_ID_GENESIS && hw->phy_type == SK_PHY_XMAC)
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cancel_rearming_delayed_work(&skge->link_thread);
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cancel_delayed_work(&skge->link_thread);
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skge_write8(skge->hw, SK_REG(skge->port, LNK_LED_REG), LED_OFF);
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if (hw->chip_id == CHIP_ID_GENESIS)
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@ -3690,6 +3691,8 @@ static void __devexit skge_remove(struct pci_dev *pdev)
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if (!hw)
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return;
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flush_scheduled_work();
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if ((dev1 = hw->dev[1]))
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unregister_netdev(dev1);
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dev0 = hw->dev[0];
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@ -3704,8 +3707,6 @@ static void __devexit skge_remove(struct pci_dev *pdev)
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skge_write16(hw, B0_LED, LED_STAT_OFF);
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skge_write8(hw, B0_CTST, CS_RST_SET);
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flush_scheduled_work();
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free_irq(pdev->irq, hw);
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pci_release_regions(pdev);
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pci_disable_device(pdev);
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