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

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Message-ID: <20171214145030.GA25329@localhost.localdomain>
Date:   Thu, 14 Dec 2017 07:50:31 -0700
From:   Keith Busch <keith.busch@...el.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     linux-pci@...r.kernel.org, bhelgaas@...gle.com,
        liudongdong3@...wei.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI/DPC: Fix shared interrupt handling

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?