RE: [PATCH 3/3] PCI: hv: Add pci_destroy_slot() in pci_devices_present_work(), if necessary

[Michael Kelley]

From: Dexuan Cui <decui@xxxxxxxxxxxxx>  Sent: Monday, March 4, 2019 1:35 PM
> 
> diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
> index b489412e3502..82acd6155adf 100644
> --- a/drivers/pci/controller/pci-hyperv.c
> +++ b/drivers/pci/controller/pci-hyperv.c
> @@ -1776,6 +1776,10 @@ static void pci_devices_present_work(struct work_struct *work)
>  		hpdev = list_first_entry(&removed, struct hv_pci_dev,
>  					 list_entry);
>  		list_del(&hpdev->list_entry);
> +
> +		if (hpdev->pci_slot)
> +			pci_destroy_slot(hpdev->pci_slot);

The code is inconsistent in whether hpdev->pci_slot is set to NULL after calling
pci_destory_slot().  Patch 2 in this series does set it to NULL, but this code does not.
And the code in hv_eject_device_work() does not set it to NULL.

It looks like all the places that test the value of hpdev->pci_slot or call
pci_destroy_slot() are serialized, so it looks like it really doesn't matter.  But when
the code is inconsistent about setting to NULL, it always makes me wonder if there
is a reason.

Michael


> +
>  		put_pcichild(hpdev);
>  	}
> 
> --
> 2.19.1