Re: [PATCH v3 2/2] PCI: Add missing link delays required by the PCIe spec

[Lukas Wunner]

On Thu, Nov 07, 2019 at 03:18:47PM +0300, Mika Westerberg wrote:
> +static int pci_bus_max_d3cold_delay(const struct pci_bus *bus)
> +{
> +	const struct pci_dev *pdev;
> +	int min_delay = 100;
> +	int max_delay = 0;
> +
> +	list_for_each_entry(pdev, &bus->devices, bus_list) {
> +		if (pdev->d3cold_delay < min_delay)
> +			min_delay = pdev->d3cold_delay;
> +		if (pdev->d3cold_delay > max_delay)
> +			max_delay = pdev->d3cold_delay;
> +	}

You need to hold pci_bus_sem when accessing the devices list.


> +	if (!dev->subordinate || list_empty(&dev->subordinate->devices))
> +		return;

Same here.


> +	child = list_first_entry(&dev->subordinate->devices, struct pci_dev,
> +				 bus_list);

And again.


Thanks,

Lukas