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Commit 71c6c837 authored by Xiaotian Feng's avatar Xiaotian Feng Committed by David S. Miller
Browse files

drivers/net: fix tasklet misuse issue 



In commit 175c0dff, drivers uses tasklet_kill to avoid put disabled tasklet
on the tasklet vec. But some of the drivers uses tasklet_init & tasklet_disable
in the driver init code, then tasklet_enable when it is opened. This makes
tasklet_enable on a killed tasklet and make ksoftirqd crazy then. Normally,
drivers should use tasklet_init/tasklet_kill on device open/remove, and use
tasklet_disable/tasklet_enable on device suspend/resume.

Reported-by: default avatarPeter Wu <lekensteyn@gmail.com>
Tested-by: default avatarPeter Wu <lekensteyn@gmail.com>
Signed-off-by: default avatarXiaotian Feng <dannyfeng@tencent.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b2942004

drivers/net/ethernet/jme.c

+8 −20
Original line number Diff line number Diff line
@@ -1860,10 +1860,14 @@ jme_open(struct net_device *netdev) 
	jme_clear_pm(jme);

	JME_NAPI_ENABLE(jme);



	tasklet_enable(&jme->linkch_task);

	tasklet_enable(&jme->txclean_task);

	tasklet_hi_enable(&jme->rxclean_task);

	tasklet_hi_enable(&jme->rxempty_task);

	tasklet_init(&jme->linkch_task, jme_link_change_tasklet,

		     (unsigned long) jme);

	tasklet_init(&jme->txclean_task, jme_tx_clean_tasklet,

		     (unsigned long) jme);

	tasklet_init(&jme->rxclean_task, jme_rx_clean_tasklet,

		     (unsigned long) jme);

	tasklet_init(&jme->rxempty_task, jme_rx_empty_tasklet,

		     (unsigned long) jme);



	rc = jme_request_irq(jme);

	if (rc)
@@ -3079,22 +3083,6 @@ jme_init_one(struct pci_dev *pdev, 
	tasklet_init(&jme->pcc_task,

		     jme_pcc_tasklet,

		     (unsigned long) jme);

	tasklet_init(&jme->linkch_task,

		     jme_link_change_tasklet,

		     (unsigned long) jme);

	tasklet_init(&jme->txclean_task,

		     jme_tx_clean_tasklet,

		     (unsigned long) jme);

	tasklet_init(&jme->rxclean_task,

		     jme_rx_clean_tasklet,

		     (unsigned long) jme);

	tasklet_init(&jme->rxempty_task,

		     jme_rx_empty_tasklet,

		     (unsigned long) jme);

	tasklet_disable_nosync(&jme->linkch_task);

	tasklet_disable_nosync(&jme->txclean_task);

	tasklet_disable_nosync(&jme->rxclean_task);

	tasklet_disable_nosync(&jme->rxempty_task);

	jme->dpi.cur = PCC_P1;



	jme->reg_ghc = 0;

drivers/net/ethernet/micrel/ksz884x.c

+4 −12
Original line number Diff line number Diff line
@@ -5459,8 +5459,10 @@ static int prepare_hardware(struct net_device *dev) 
	rc = request_irq(dev->irq, netdev_intr, IRQF_SHARED, dev->name, dev);

	if (rc)

		return rc;

	tasklet_enable(&hw_priv->rx_tasklet);

	tasklet_enable(&hw_priv->tx_tasklet);

	tasklet_init(&hw_priv->rx_tasklet, rx_proc_task,

		     (unsigned long) hw_priv);

	tasklet_init(&hw_priv->tx_tasklet, tx_proc_task,

		     (unsigned long) hw_priv);



	hw->promiscuous = 0;

	hw->all_multi = 0;
@@ -7033,16 +7035,6 @@ static int __devinit pcidev_init(struct pci_dev *pdev, 
	spin_lock_init(&hw_priv->hwlock);

	mutex_init(&hw_priv->lock);



	/* tasklet is enabled. */

	tasklet_init(&hw_priv->rx_tasklet, rx_proc_task,

		(unsigned long) hw_priv);

	tasklet_init(&hw_priv->tx_tasklet, tx_proc_task,

		(unsigned long) hw_priv);



	/* tasklet_enable will decrement the atomic counter. */

	tasklet_disable(&hw_priv->rx_tasklet);

	tasklet_disable(&hw_priv->tx_tasklet);



	for (i = 0; i < TOTAL_PORT_NUM; i++)

		init_waitqueue_head(&hw_priv->counter[i].counter);

drivers/net/ethernet/xilinx/xilinx_axienet_main.c

+6 −6
Original line number Diff line number Diff line
@@ -942,6 +942,10 @@ static int axienet_open(struct net_device *ndev) 
		phy_start(lp->phy_dev);

	}



	/* Enable tasklets for Axi DMA error handling */

	tasklet_init(&lp->dma_err_tasklet, axienet_dma_err_handler,

		     (unsigned long) lp);



	/* Enable interrupts for Axi DMA Tx */

	ret = request_irq(lp->tx_irq, axienet_tx_irq, 0, ndev->name, ndev);

	if (ret)
@@ -950,8 +954,7 @@ static int axienet_open(struct net_device *ndev) 
	ret = request_irq(lp->rx_irq, axienet_rx_irq, 0, ndev->name, ndev);

	if (ret)

		goto err_rx_irq;

	/* Enable tasklets for Axi DMA error handling */

	tasklet_enable(&lp->dma_err_tasklet);



	return 0;



err_rx_irq:
@@ -960,6 +963,7 @@ static int axienet_open(struct net_device *ndev) 
	if (lp->phy_dev)

		phy_disconnect(lp->phy_dev);

	lp->phy_dev = NULL;

	tasklet_kill(&lp->dma_err_tasklet);

	dev_err(lp->dev, "request_irq() failed\n");

	return ret;

}
@@ -1613,10 +1617,6 @@ static int __devinit axienet_of_probe(struct platform_device *op) 
		goto err_iounmap_2;

	}



	tasklet_init(&lp->dma_err_tasklet, axienet_dma_err_handler,

		     (unsigned long) lp);

	tasklet_disable(&lp->dma_err_tasklet);



	return 0;



err_iounmap_2: