APPLIED: [Bionic][PATCH v2] ixgbe/ixgbevf: Free IRQ when PCI error recovery removes the device
Khaled Elmously
khalid.elmously at canonical.com
Tue Jun 19 18:14:23 UTC 2018
Applied to Bionic
On 2018-06-12 10:27:37 , Mauro S. M. Rodrigues wrote:
> From: Mauro S M Rodrigues <maurosr at linux.vnet.ibm.com>
>
> BugLink: http://bugs.launchpad.net/bugs/1776389
>
> Since commit f7f37e7ff2b9 ("ixgbe: handle close/suspend race with
> netif_device_detach/present") ixgbe_close_suspend is called, from
> ixgbe_close, only if the device is present, i.e. if it isn't detached.
> That exposed a situation where IRQs weren't freed if a PCI error
> recovery system opts to remove the device. For such case the pci channel
> state is set to pci_channel_io_perm_failure and ixgbe_io_error_detected
> was returning PCI_ERS_RESULT_DISCONNECT before calling
> ixgbe_close_suspend consequentially not freeing IRQ and crashing when
> the remove handler calls pci_disable_device, hitting a BUG_ON at
> free_msi_irqs, which asserts that there is no non-free IRQ associated
> with the device to be removed:
>
> BUG_ON(irq_has_action(entry->irq + i));
>
> The issue is fixed by calling the ixgbe_close_suspend before evaluate
> the pci channel state.
>
> Reported-by: Naresh Bannoth <nbannoth at in.ibm.com>
> Reported-by: Abdul Haleem <abdhalee at in.ibm.com>
> Signed-off-by: Mauro S M Rodrigues <maurosr at linux.vnet.ibm.com>
> Reviewed-by: Alexander Duyck <alexander.h.duyck at intel.com>
> Tested-by: Andrew Bowers <andrewx.bowers at intel.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher at intel.com>
> (cherry picked from commit b212d815e77c72be921979119c715166cc8987b1)
> Signed-off-by: Mauro S. M. Rodrigues <maurosr at linux.vnet.ibm.com>
> ---
> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 6 +++---
> drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 6 +++---
> 2 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> index a549c4870882..e1326c0603af 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> @@ -10910,14 +10910,14 @@ static pci_ers_result_t ixgbe_io_error_detected(struct pci_dev *pdev,
> rtnl_lock();
> netif_device_detach(netdev);
>
> + if (netif_running(netdev))
> + ixgbe_close_suspend(adapter);
> +
> if (state == pci_channel_io_perm_failure) {
> rtnl_unlock();
> return PCI_ERS_RESULT_DISCONNECT;
> }
>
> - if (netif_running(netdev))
> - ixgbe_close_suspend(adapter);
> -
> if (!test_and_set_bit(__IXGBE_DISABLED, &adapter->state))
> pci_disable_device(pdev);
> rtnl_unlock();
> diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> index 1f4a69134ade..64859f8318c8 100644
> --- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> +++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
> @@ -4241,14 +4241,14 @@ static pci_ers_result_t ixgbevf_io_error_detected(struct pci_dev *pdev,
> rtnl_lock();
> netif_device_detach(netdev);
>
> + if (netif_running(netdev))
> + ixgbevf_close_suspend(adapter);
> +
> if (state == pci_channel_io_perm_failure) {
> rtnl_unlock();
> return PCI_ERS_RESULT_DISCONNECT;
> }
>
> - if (netif_running(netdev))
> - ixgbevf_close_suspend(adapter);
> -
> if (!test_and_set_bit(__IXGBEVF_DISABLED, &adapter->state))
> pci_disable_device(pdev);
> rtnl_unlock();
> --
> 2.11.0
>
>
> --
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