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RDMA/nes: Fix SFP+ link down detection issue with switch port disable

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In case of SFP+ PHY, link status check at interrupt processing can
give false results.  For proper link status change detection a delayed
recheck is needed to give nes registers time to settle.  Add a
periodic link status recheck scheduled at interrupt to detect
potential delayed registers state changes.

Addresses: http://bugs.openfabrics.org/bugzilla/show_bug.cgi?id=2117
Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Maciej Sosnowski
2010-11-24 17:29:46 +00:00
committed by Roland Dreier
parent ea623455b7
commit 5f61b2c693
4 changed files with 100 additions and 0 deletions
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11
drivers/infiniband/hw/nes/nes.c
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@@ -674,6 +674,8 @@ static int __devinit nes_probe(struct pci_dev *pcidev, const struct pci_device_i
}
nes_notifiers_registered++;
INIT_DELAYED_WORK(&nesdev->work, nes_recheck_link_status);
/* Initialize network devices */
if ((netdev = nes_netdev_init(nesdev, mmio_regs)) == NULL)
goto bail7;
@@ -756,6 +758,7 @@ static void __devexit nes_remove(struct pci_dev *pcidev)
struct nes_device *nesdev = pci_get_drvdata(pcidev);
struct net_device *netdev;
int netdev_index = 0;
unsigned long flags;
if (nesdev->netdev_count) {
netdev = nesdev->netdev[netdev_index];
@@ -782,6 +785,14 @@ static void __devexit nes_remove(struct pci_dev *pcidev)
free_irq(pcidev->irq, nesdev);
tasklet_kill(&nesdev->dpc_tasklet);
spin_lock_irqsave(&nesdev->nesadapter->phy_lock, flags);
if (nesdev->link_recheck) {
spin_unlock_irqrestore(&nesdev->nesadapter->phy_lock, flags);
cancel_delayed_work_sync(&nesdev->work);
} else {
spin_unlock_irqrestore(&nesdev->nesadapter->phy_lock, flags);
}
/* Deallocate the Adapter Structure */
nes_destroy_adapter(nesdev->nesadapter);