Re: [PATCH] PCI/DPC: Fix shared interrupt handling

[Keith Busch]

On Wed, Dec 13, 2017 at 05:01:58PM -0700, Alex Williamson wrote:
> @@ -109,6 +109,7 @@ static void interrupt_event_handler(struct work_struct *work)
>  	struct dpc_dev *dpc = container_of(work, struct dpc_dev, work);
>  	struct pci_dev *dev, *temp, *pdev = dpc->dev->port;
>  	struct pci_bus *parent = pdev->subordinate;
> +	u16 ctl;
>  
>  	pci_lock_rescan_remove();
>  	list_for_each_entry_safe_reverse(dev, temp, &parent->devices,
> @@ -135,6 +136,10 @@ static void interrupt_event_handler(struct work_struct *work)
>  
>  	pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS,
>  		PCI_EXP_DPC_STATUS_TRIGGER | PCI_EXP_DPC_STATUS_INTERRUPT);
> +
> +	pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, &ctl);
> +	pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL,
> +			      ctl & ~PCI_EXP_DPC_CTL_INT_EN);

Did you mean to re-enable the interrupt here rather than mask it off?