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Message-ID: <CANEJEGucRU5qkWGekPHr8r3TA0Xb3NFqN6SkNzfpBqR=cwWDrQ@mail.gmail.com>
Date: Fri, 6 Apr 2012 09:56:09 -0700
From: Grant Grundler <grantgrundler@...il.com>
To: Francois Romieu <romieu@...zoreil.com>
Cc: netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
Grant Grundler <grundler@...isc-linux.org>
Subject: Re: [PATCH net-next #2 24/39] xircom_cb: fix device probe error path.
On Fri, Apr 6, 2012 at 3:06 AM, Francois Romieu <romieu@...zoreil.com> wrote:
> - unbalanced pci_disable_device
> - PCI ressources were not released
> - mismatching pci_alloc_.../kfree pairs are replaced by DMA alloc helpers.
>
> Signed-off-by: Francois Romieu <romieu@...zoreil.com>
> Cc: Grant Grundler <grundler@...isc-linux.org>
Acked-by: Grant Grundler <grundler@...isc-linux.org>
Very nice - thank you! :)
grant
> ---
> drivers/net/ethernet/dec/tulip/xircom_cb.c | 53 ++++++++++++++++++----------
> 1 files changed, 34 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/net/ethernet/dec/tulip/xircom_cb.c b/drivers/net/ethernet/dec/tulip/xircom_cb.c
> index fdb329f..cbcc6d6 100644
> --- a/drivers/net/ethernet/dec/tulip/xircom_cb.c
> +++ b/drivers/net/ethernet/dec/tulip/xircom_cb.c
> @@ -192,15 +192,18 @@ static const struct net_device_ops netdev_ops = {
> */
> static int __devinit xircom_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> {
> + struct device *d = &pdev->dev;
> struct net_device *dev = NULL;
> struct xircom_private *private;
> unsigned long flags;
> unsigned short tmp16;
> + int rc;
>
> /* First do the PCI initialisation */
>
> - if (pci_enable_device(pdev))
> - return -ENODEV;
> + rc = pci_enable_device(pdev);
> + if (rc < 0)
> + goto out;
>
> /* disable all powermanagement */
> pci_write_config_dword(pdev, PCI_POWERMGMT, 0x0000);
> @@ -211,11 +214,13 @@ static int __devinit xircom_probe(struct pci_dev *pdev, const struct pci_device_
> pci_read_config_word (pdev,PCI_STATUS, &tmp16);
> pci_write_config_word (pdev, PCI_STATUS,tmp16);
>
> - if (!request_region(pci_resource_start(pdev, 0), 128, "xircom_cb")) {
> + rc = pci_request_regions(pdev, "xircom_cb");
> + if (rc < 0) {
> pr_err("%s: failed to allocate io-region\n", __func__);
> - return -ENODEV;
> + goto err_disable;
> }
>
> + rc = -ENOMEM;
> /*
> Before changing the hardware, allocate the memory.
> This way, we can fail gracefully if not enough memory
> @@ -223,17 +228,21 @@ static int __devinit xircom_probe(struct pci_dev *pdev, const struct pci_device_
> */
> dev = alloc_etherdev(sizeof(struct xircom_private));
> if (!dev)
> - goto device_fail;
> + goto err_release;
>
> private = netdev_priv(dev);
>
> /* Allocate the send/receive buffers */
> - private->rx_buffer = pci_alloc_consistent(pdev,8192,&private->rx_dma_handle);
> + private->rx_buffer = dma_alloc_coherent(d, 8192,
> + &private->rx_dma_handle,
> + GFP_KERNEL);
> if (private->rx_buffer == NULL) {
> pr_err("%s: no memory for rx buffer\n", __func__);
> goto rx_buf_fail;
> }
> - private->tx_buffer = pci_alloc_consistent(pdev,8192,&private->tx_dma_handle);
> + private->tx_buffer = dma_alloc_coherent(d, 8192,
> + &private->tx_dma_handle,
> + GFP_KERNEL);
> if (private->tx_buffer == NULL) {
> pr_err("%s: no memory for tx buffer\n", __func__);
> goto tx_buf_fail;
> @@ -256,7 +265,8 @@ static int __devinit xircom_probe(struct pci_dev *pdev, const struct pci_device_
> dev->netdev_ops = &netdev_ops;
> pci_set_drvdata(pdev, dev);
>
> - if (register_netdev(dev)) {
> + rc = register_netdev(dev);
> + if (rc < 0) {
> pr_err("%s: netdevice registration failed\n", __func__);
> goto reg_fail;
> }
> @@ -273,17 +283,21 @@ static int __devinit xircom_probe(struct pci_dev *pdev, const struct pci_device_
> spin_unlock_irqrestore(&private->lock,flags);
>
> trigger_receive(private);
> -
> - return 0;
> +out:
> + return rc;
>
> reg_fail:
> - kfree(private->tx_buffer);
> + pci_set_drvdata(pdev, NULL);
> + dma_free_coherent(d, 8192, private->tx_buffer, private->tx_dma_handle);
> tx_buf_fail:
> - kfree(private->rx_buffer);
> + dma_free_coherent(d, 8192, private->rx_buffer, private->rx_dma_handle);
> rx_buf_fail:
> free_netdev(dev);
> -device_fail:
> - return -ENODEV;
> +err_release:
> + pci_release_regions(pdev);
> +err_disable:
> + pci_disable_device(pdev);
> + goto out;
> }
>
>
> @@ -297,14 +311,15 @@ static void __devexit xircom_remove(struct pci_dev *pdev)
> {
> struct net_device *dev = pci_get_drvdata(pdev);
> struct xircom_private *card = netdev_priv(dev);
> + struct device *d = &pdev->dev;
>
> - pci_free_consistent(pdev,8192,card->rx_buffer,card->rx_dma_handle);
> - pci_free_consistent(pdev,8192,card->tx_buffer,card->tx_dma_handle);
> -
> - release_region(dev->base_addr, 128);
> unregister_netdev(dev);
> - free_netdev(dev);
> pci_set_drvdata(pdev, NULL);
> + dma_free_coherent(d, 8192, card->tx_buffer, card->tx_dma_handle);
> + dma_free_coherent(d, 8192, card->rx_buffer, card->rx_dma_handle);
> + free_netdev(dev);
> + pci_release_regions(pdev);
> + pci_disable_device(pdev);
> }
>
> static irqreturn_t xircom_interrupt(int irq, void *dev_instance)
> --
> 1.7.7.6
>
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