[RFC 27/32] PCI/sysfs: make I/O resource depend on HAS_IOPORT

Niklas Schnelle
2021-12-27T16:44:48Z

Exporting I/O resources only makes sense if legacy I/O spaces are
supported so conditionally add them only if HAS_IOPORT is set.

Co-developed-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
---
drivers/pci/pci-sysfs.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index cfe2f85af09e..a59a85593972 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1099,6 +1099,7 @@ static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
return pci_mmap_resource(kobj, attr, vma, 1);
}

+#ifdef CONFIG_HAS_IOPORT
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)
@@ -1157,6 +1158,21 @@ static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,

return pci_resource_io(filp, kobj, attr, buf, off, count, true);
}
+#else
+static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *attr, char *buf,
+ loff_t off, size_t count)
+{
+ return -ENXIO;
+}
+
+static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *attr, char *buf,
+ loff_t off, size_t count)
+{
+ return -ENXIO;
+}
+#endif

/**
* pci_remove_resource_files - cleanup resource files
--
2.32.0