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drivers/net: fix tasklet misuse issue

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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: Peter Wu <lekensteyn@gmail.com>
Tested-by: Peter Wu <lekensteyn@gmail.com>
Signed-off-by: Xiaotian 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: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xiaotian Feng 2012-11-13 19:47:36 +00:00 • committed by David S. Miller
commit 71c6c837a0
3 changed files with 18 additions and 38 deletions
Download patch file Download diff file Expand all files Collapse all files

28
drivers/net/ethernet/jme.c
View file

@ -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;

16
drivers/net/ethernet/micrel/ksz884x.c
View file

@ -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);

12
drivers/net/ethernet/xilinx/xilinx_axienet_main.c
View file

@ -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 @@ err_tx_irq:
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: