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Date: Wed, 24 Sep 2008 20:51:29 -0400
From: Jeff Garzik <jgarzik@...ox.com>
To: Scott Feldman <scofeldm@...co.com>
CC: netdev@...r.kernel.org
Subject: Re: [PATCH 4/4] enic: bug fix: don't set netdev->name too early
Scott Feldman wrote:
> enic: bug fix: don't set netdev->name too early
>
> Bug fix: don't set netdev->name early before netdev registration. Setting
> netdev->name early with dev_alloc_name() would occasionally cause netdev
> registration to fail returning error that device was already registered.
> Since we're using netdev->name to name MSI-X vectors, we now need to
> move the request_irq after netdev registartion, so move it to ->open.
>
> Signed-off-by: Scott Feldman <scofeldm@...co.com>
> ---
> drivers/net/enic/enic.h | 2 -
> drivers/net/enic/enic_main.c | 121 ++++++++++++++++--------------------------
> 2 files changed, 47 insertions(+), 76 deletions(-)
>
> diff --git a/drivers/net/enic/enic.h b/drivers/net/enic/enic.h
> index 9e0d484..7f677e8 100644
> --- a/drivers/net/enic/enic.h
> +++ b/drivers/net/enic/enic.h
> @@ -33,7 +33,7 @@
>
> #define DRV_NAME "enic"
> #define DRV_DESCRIPTION "Cisco 10G Ethernet Driver"
> -#define DRV_VERSION "0.0.1.18163.472"
> +#define DRV_VERSION "0.0.1-18163.472-k1"
> #define DRV_COPYRIGHT "Copyright 2008 Cisco Systems, Inc"
> #define PFX DRV_NAME ": "
>
> diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
> index 14e59a7..180e968 100644
> --- a/drivers/net/enic/enic_main.c
> +++ b/drivers/net/enic/enic_main.c
> @@ -1251,13 +1251,28 @@ static int enic_open(struct net_device *netdev)
> unsigned int i;
> int err;
>
> + err = enic_request_intr(enic);
> + if (err) {
> + printk(KERN_ERR PFX "%s: Unable to request irq.\n",
> + netdev->name);
> + return err;
> + }
> +
> + err = enic_notify_set(enic);
> + if (err) {
> + printk(KERN_ERR PFX
> + "%s: Failed to alloc notify buffer, aborting.\n",
> + netdev->name);
> + goto err_out_free_intr;
> + }
> +
> for (i = 0; i < enic->rq_count; i++) {
> err = vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
> if (err) {
> printk(KERN_ERR PFX
> "%s: Unable to alloc receive buffers.\n",
> netdev->name);
> - return err;
> + goto err_out_notify_unset;
> }
> }
>
> @@ -1279,6 +1294,13 @@ static int enic_open(struct net_device *netdev)
> enic_notify_timer_start(enic);
>
> return 0;
> +
> +err_out_notify_unset:
> + vnic_dev_notify_unset(enic->vdev);
> +err_out_free_intr:
> + enic_free_intr(enic);
> +
> + return err;
> }
>
> /* rtnl lock is held, process context */
> @@ -1308,6 +1330,9 @@ static int enic_stop(struct net_device *netdev)
> return err;
> }
>
> + vnic_dev_notify_unset(enic->vdev);
> + enic_free_intr(enic);
> +
> (void)vnic_cq_service(&enic->cq[ENIC_CQ_RQ],
> -1, enic_rq_service_drop, NULL);
> (void)vnic_cq_service(&enic->cq[ENIC_CQ_WQ],
> @@ -1593,18 +1618,6 @@ static int __devinit enic_probe(struct pci_dev *pdev,
> return -ENOMEM;
> }
>
> - /* Set the netdev name early so intr vectors are properly
> - * named and any error msgs can include netdev->name
> - */
> -
> - rtnl_lock();
> - err = dev_alloc_name(netdev, netdev->name);
> - rtnl_unlock();
> - if (err < 0) {
> - printk(KERN_ERR PFX "Unable to allocate netdev name.\n");
> - goto err_out_free_netdev;
> - }
> -
> pci_set_drvdata(pdev, netdev);
>
> SET_NETDEV_DEV(netdev, &pdev->dev);
> @@ -1619,16 +1632,14 @@ static int __devinit enic_probe(struct pci_dev *pdev,
> err = pci_enable_device(pdev);
> if (err) {
> printk(KERN_ERR PFX
> - "%s: Cannot enable PCI device, aborting.\n",
> - netdev->name);
> + "Cannot enable PCI device, aborting.\n");
> goto err_out_free_netdev;
> }
>
> err = pci_request_regions(pdev, DRV_NAME);
> if (err) {
> printk(KERN_ERR PFX
> - "%s: Cannot request PCI regions, aborting.\n",
> - netdev->name);
> + "Cannot request PCI regions, aborting.\n");
> goto err_out_disable_device;
> }
>
> @@ -1644,25 +1655,22 @@ static int __devinit enic_probe(struct pci_dev *pdev,
> err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
> if (err) {
> printk(KERN_ERR PFX
> - "%s: No usable DMA configuration, aborting.\n",
> - netdev->name);
> + "No usable DMA configuration, aborting.\n");
> goto err_out_release_regions;
> }
> err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
> if (err) {
> printk(KERN_ERR PFX
> - "%s: Unable to obtain 32-bit DMA "
> - "for consistent allocations, aborting.\n",
> - netdev->name);
> + "Unable to obtain 32-bit DMA "
> + "for consistent allocations, aborting.\n");
> goto err_out_release_regions;
> }
> } else {
> err = pci_set_consistent_dma_mask(pdev, DMA_40BIT_MASK);
> if (err) {
> printk(KERN_ERR PFX
> - "%s: Unable to obtain 40-bit DMA "
> - "for consistent allocations, aborting.\n",
> - netdev->name);
> + "Unable to obtain 40-bit DMA "
> + "for consistent allocations, aborting.\n");
> goto err_out_release_regions;
> }
> using_dac = 1;
> @@ -1673,8 +1681,7 @@ static int __devinit enic_probe(struct pci_dev *pdev,
>
> if (!(pci_resource_flags(pdev, 0) & IORESOURCE_MEM)) {
> printk(KERN_ERR PFX
> - "%s: BAR0 not memory-map'able, aborting.\n",
> - netdev->name);
> + "BAR0 not memory-map'able, aborting.\n");
> err = -ENODEV;
> goto err_out_release_regions;
> }
> @@ -1685,8 +1692,7 @@ static int __devinit enic_probe(struct pci_dev *pdev,
>
> if (!enic->bar0.vaddr) {
> printk(KERN_ERR PFX
> - "%s: Cannot memory-map BAR0 res hdr, aborting.\n",
> - netdev->name);
> + "Cannot memory-map BAR0 res hdr, aborting.\n");
> err = -ENODEV;
> goto err_out_release_regions;
> }
> @@ -1697,8 +1703,7 @@ static int __devinit enic_probe(struct pci_dev *pdev,
> enic->vdev = vnic_dev_register(NULL, enic, pdev, &enic->bar0);
> if (!enic->vdev) {
> printk(KERN_ERR PFX
> - "%s: vNIC registration failed, aborting.\n",
> - netdev->name);
> + "vNIC registration failed, aborting.\n");
> err = -ENODEV;
> goto err_out_iounmap;
> }
> @@ -1709,8 +1714,7 @@ static int __devinit enic_probe(struct pci_dev *pdev,
> err = enic_dev_open(enic);
> if (err) {
> printk(KERN_ERR PFX
> - "%s: vNIC dev open failed, aborting.\n",
> - netdev->name);
> + "vNIC dev open failed, aborting.\n");
> goto err_out_vnic_unregister;
> }
>
> @@ -1727,8 +1731,7 @@ static int __devinit enic_probe(struct pci_dev *pdev,
> err = vnic_dev_init(enic->vdev, 0);
> if (err) {
> printk(KERN_ERR PFX
> - "%s: vNIC dev init failed, aborting.\n",
> - netdev->name);
> + "vNIC dev init failed, aborting.\n");
> goto err_out_dev_close;
> }
>
> @@ -1738,8 +1741,7 @@ static int __devinit enic_probe(struct pci_dev *pdev,
> err = enic_get_vnic_config(enic);
> if (err) {
> printk(KERN_ERR PFX
> - "%s: Get vNIC configuration failed, aborting.\n",
> - netdev->name);
> + "Get vNIC configuration failed, aborting.\n");
> goto err_out_dev_close;
> }
>
> @@ -1755,18 +1757,7 @@ static int __devinit enic_probe(struct pci_dev *pdev,
> err = enic_set_intr_mode(enic);
> if (err) {
> printk(KERN_ERR PFX
> - "%s: Failed to set intr mode, aborting.\n",
> - netdev->name);
> - goto err_out_dev_close;
> - }
> -
> - /* Request interrupt vector(s)
> - */
> -
> - err = enic_request_intr(enic);
> - if (err) {
> - printk(KERN_ERR PFX "%s: Unable to request irq.\n",
> - netdev->name);
> + "Failed to set intr mode, aborting.\n");
> goto err_out_dev_close;
> }
>
> @@ -1776,8 +1767,7 @@ static int __devinit enic_probe(struct pci_dev *pdev,
> err = enic_alloc_vnic_resources(enic);
> if (err) {
> printk(KERN_ERR PFX
> - "%s: Failed to alloc vNIC resources, aborting.\n",
> - netdev->name);
> + "Failed to alloc vNIC resources, aborting.\n");
> goto err_out_free_vnic_resources;
> }
>
> @@ -1793,19 +1783,7 @@ static int __devinit enic_probe(struct pci_dev *pdev,
> ig_vlan_strip_en);
> if (err) {
> printk(KERN_ERR PFX
> - "%s: Failed to config nic, aborting.\n",
> - netdev->name);
> - goto err_out_free_vnic_resources;
> - }
> -
> - /* Setup notification buffer area
> - */
> -
> - err = enic_notify_set(enic);
> - if (err) {
> - printk(KERN_ERR PFX
> - "%s: Failed to alloc notify buffer, aborting.\n",
> - netdev->name);
> + "Failed to config nic, aborting.\n");
> goto err_out_free_vnic_resources;
> }
>
> @@ -1832,9 +1810,8 @@ static int __devinit enic_probe(struct pci_dev *pdev,
> err = enic_set_mac_addr(netdev, enic->mac_addr);
> if (err) {
> printk(KERN_ERR PFX
> - "%s: Invalid MAC address, aborting.\n",
> - netdev->name);
> - goto err_out_notify_unset;
> + "Invalid MAC address, aborting.\n");
> + goto err_out_free_vnic_resources;
> }
>
> netdev->open = enic_open;
> @@ -1888,18 +1865,14 @@ static int __devinit enic_probe(struct pci_dev *pdev,
> err = register_netdev(netdev);
> if (err) {
> printk(KERN_ERR PFX
> - "%s: Cannot register net device, aborting.\n",
> - netdev->name);
> - goto err_out_notify_unset;
> + "Cannot register net device, aborting.\n");
> + goto err_out_free_vnic_resources;
> }
>
> return 0;
>
> -err_out_notify_unset:
> - vnic_dev_notify_unset(enic->vdev);
> err_out_free_vnic_resources:
> enic_free_vnic_resources(enic);
> - enic_free_intr(enic);
> err_out_dev_close:
> vnic_dev_close(enic->vdev);
> err_out_vnic_unregister:
> @@ -1927,9 +1900,7 @@ static void __devexit enic_remove(struct pci_dev *pdev)
>
applied 1-4
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