linux-kernel - Re: [PATCH] PCI: stop crashing in pci_release

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Date:   Wed, 21 Feb 2018 21:24:37 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Christian König <ckoenig.leichtzumerken@...il.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH] PCI: stop crashing in pci_release_resource v2

On Wed, Feb 21, 2018 at 11:07 AM, Christian König
<ckoenig.leichtzumerken@...il.com> wrote:
> Is it entirely possible that the BIOS wasn't able to assign resources to
> a device. In this case don't crash in pci_release_resource() when we try
> to resize the resource.
>
> v2: keep printing the info that we try to release the BAR
>

FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Signed-off-by: Christian König <christian.koenig@....com>
> CC: stable@...r.kernel.org
> ---
>  drivers/pci/setup-res.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
> index e815111f3f81..c0f091614805 100644
> --- a/drivers/pci/setup-res.c
> +++ b/drivers/pci/setup-res.c
> @@ -402,6 +402,10 @@ void pci_release_resource(struct pci_dev *dev, int resno)
>         struct resource *res = dev->resource + resno;
>
>         dev_info(&dev->dev, "BAR %d: releasing %pR\n", resno, res);
> +
> +       if (!res->parent)
> +               return;
> +
>         release_resource(res);
>         res->end = resource_size(res) - 1;
>         res->start = 0;
> --
> 2.14.1
>



-- 
With Best Regards,
Andy Shevchenko