linux-kernel - [PATCH v4 23/41] PCI/sysfs: Make I/O resource depend on HAS

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Message-Id: <20230516110038.2413224-24-schnelle@linux.ibm.com>
Date:   Tue, 16 May 2023 13:00:19 +0200
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     Arnd Bergmann <arnd@...db.de>, Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     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: [PATCH v4 23/41] PCI/sysfs: Make I/O resource depend on HAS_IOPORT

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: Arnd Bergmann <arnd@...nel.org>
Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
---
Note: The HAS_IOPORT Kconfig option was added in v6.4-rc1 so
      per-subsystem patches may be applied independently

 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 ab32a91f287b..d9eede2dbc0e 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,
-- 
2.39.2