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PCI/sysfs: Make I/O resource depend on HAS_IOPORT

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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@kernel.org>
Link: https://lore.kernel.org/r/20230703135255.2202721-3-schnelle@linux.ibm.com
Signed-off-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Niklas Schnelle 2023-07-03 15:52:55 +02:00 committed by Bjorn Helgaas
parent f768c75d61
commit 5da1b58868
1 changed files with 4 additions and 0 deletions
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4
drivers/pci/pci-sysfs.c
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@ -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,