diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 9c71858..bc19c19 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -720,6 +720,7 @@ int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
 {
 	struct bin_attribute *attr = NULL;
 	int retval;
+	int rom_size = 0;
 
 	if (!sysfs_initialized)
 		return -EACCES;
@@ -755,12 +756,16 @@ int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
 		goto err_vpd_file;
 
 	/* If the device has a ROM, try to expose it in sysfs. */
-	if (pci_resource_len(pdev, PCI_ROM_RESOURCE) ||
-	    (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)) {
+	if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
+		rom_size = 0x20000;
+	else if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
+		rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
+
+	if (size)
 		attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
 		if (attr) {
 			pdev->rom_attr = attr;
-			attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
+			attr->size = rom_size;
 			attr->attr.name = "rom";
 			attr->attr.mode = S_IRUSR;
 			attr->read = pci_read_rom;