diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 1fbc3daf87cc..2e4e226e78d4 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1082,20 +1082,24 @@ static int pci_mmap_resource(struct kobject *kobj, const struct bin_attribute *a
 	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
 	int bar = (unsigned long)attr->private;
 	enum pci_mmap_state mmap_type;
-	struct resource *res = pci_resource_n(pdev, bar);
 	int ret;
 
 	ret = security_locked_down(LOCKDOWN_PCI_ACCESS);
 	if (ret)
 		return ret;
 
-	if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start))
+	if (!pci_resource_is_mem(pdev, bar) &&
+	    !(pci_resource_is_io(pdev, bar) && arch_can_pci_mmap_io()))
+		return -EIO;
+
+	if (pci_resource_is_mem(pdev, bar) &&
+	    iomem_is_exclusive(pci_resource_start(pdev, bar)))
 		return -EINVAL;
 
 	if (!pci_mmap_fits(pdev, bar, vma, PCI_MMAP_SYSFS))
 		return -EINVAL;
 
-	mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
+	mmap_type = pci_resource_is_mem(pdev, bar) ? pci_mmap_mem : pci_mmap_io;
 
 	return pci_mmap_resource_range(pdev, bar, vma, mmap_type, write_combine);
 }
@@ -1123,6 +1127,9 @@ static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj,
 	int bar = (unsigned long)attr->private;
 	unsigned long port = off;
 
+	if (!pci_resource_is_io(pdev, bar))
+		return -EIO;
+
 	port += pci_resource_start(pdev, bar);
 
 	if (port > pci_resource_end(pdev, bar))