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

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Message-ID: <20191109144919.a2whrvyih4k4fu42@wunner.de>
Date:   Sat, 9 Nov 2019 15:49:19 +0100
From:   Lukas Wunner <lukas@...ner.de>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Keith Busch <keith.busch@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Alexandru Gagniuc <mr.nuke.me@...il.com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Paul Menzel <pmenzel@...gen.mpg.de>,
        Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] PCI: Add missing link delays required by the PCIe
 spec

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