linux-kernel - Re: [PATCH v3 23/38] PCI/sysfs: Make I/O resource depend on HAS

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Date:   Tue, 14 Mar 2023 11:05:14 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Niklas Schnelle <schnelle@...ux.ibm.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-pci@...r.kernel.org, Arnd Bergmann <arnd@...nel.org>
Subject: Re: [PATCH v3 23/38] PCI/sysfs: Make I/O resource depend on
 HAS_IOPORT

On Tue, Mar 14, 2023 at 01:12:01PM +0100, Niklas Schnelle wrote:
> If legacy I/O spaces are not supported simply return an error when
> trying to access them via pci_resource_io(). This allows inb() and
> friends to become undefined when they are known at compile time to be
> non-functional in a later patch.
> 
> Co-developed-by: Arnd Bergmann <arnd@...nel.org>
> Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

> ---
>  drivers/pci/pci-sysfs.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index dd0d9d9bc509..11e92d106761 100644
> --- a/drivers/pci/pci-sysfs.c
> +++ b/drivers/pci/pci-sysfs.c
> @@ -1083,6 +1083,7 @@ static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
>  			       struct bin_attribute *attr, char *buf,
>  			       loff_t off, size_t count, bool write)
>  {
> +#ifdef CONFIG_HAS_IOPORT
>  	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
>  	int bar = (unsigned long)attr->private;
>  	unsigned long port = off;
> @@ -1116,6 +1117,9 @@ static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
>  		return 4;
>  	}
>  	return -EINVAL;
> +#else
> +	return -ENXIO;
> +#endif
>  }
>  
>  static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
> -- 
> 2.37.2
>