linux-kernel - Re: [PATCH 20/24] thunderbolt: Do not touch the hardware if the NHI is gone on resume

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Date:   Wed, 24 May 2017 16:43:10 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <yehezkel.bernat@...el.com>,
        Amir Levy <amir.jer.levy@...el.com>,
        Andy Lutomirski <luto@...nel.org>, Mario.Limonciello@...l.com,
        Jared.Dominguez@...l.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 20/24] thunderbolt: Do not touch the hardware if the NHI
 is gone on resume

On Thu, May 18, 2017 at 05:39:10PM +0300, Mika Westerberg wrote:
> @@ -655,6 +659,16 @@ static int nhi_resume_noirq(struct device *dev)
>  {
>  	struct pci_dev *pdev = to_pci_dev(dev);
>  	struct tb *tb = pci_get_drvdata(pdev);
> +	u32 vid;
> +
> +	/*
> +	 * Check that the device is still there. It may be that the user
> +	 * unplugged last device which causes the host controller to go
> +	 * away on PCs.
> +	 */
> +	pci_read_config_dword(pdev, PCI_VENDOR_ID, &vid);
> +	if (vid == ~0)
> +		tb->nhi->going_away = true;

if (!pci_device_is_present(pdev))

Thanks,

Lukas