diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 2e4e226e78d4..2280b7edb41f 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -881,13 +881,26 @@ static const struct attribute_group pci_dev_config_attr_group = {
  * llseek operation for mmappable PCI resources.
  * May be left unused if the arch doesn't provide them.
  */
+static __maybe_unused loff_t
+pci_llseek_resource_legacy(struct file *filep,
+			   struct kobject *kobj __always_unused,
+			   const struct bin_attribute *attr,
+			   loff_t offset, int whence)
+{
+	return fixed_size_llseek(filep, offset, whence, attr->size);
+}
+
 static __maybe_unused loff_t
 pci_llseek_resource(struct file *filep,
-		    struct kobject *kobj __always_unused,
+		    struct kobject *kobj,
 		    const struct bin_attribute *attr,
 		    loff_t offset, int whence)
 {
-	return fixed_size_llseek(filep, offset, whence, attr->size);
+	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
+	int bar = (unsigned long)attr->private;
+
+	return fixed_size_llseek(filep, offset, whence,
+				 pci_resource_len(pdev, bar));
 }
 
 #ifdef HAVE_PCI_LEGACY
@@ -1022,7 +1035,7 @@ void pci_create_legacy_files(struct pci_bus *b)
 	b->legacy_io->read = pci_read_legacy_io;
 	b->legacy_io->write = pci_write_legacy_io;
 	/* See pci_create_attr() for motivation */
-	b->legacy_io->llseek = pci_llseek_resource;
+	b->legacy_io->llseek = pci_llseek_resource_legacy;
 	b->legacy_io->mmap = pci_mmap_legacy_io;
 	b->legacy_io->f_mapping = iomem_get_mapping;
 	pci_adjust_legacy_attr(b, pci_mmap_io);
@@ -1038,7 +1051,7 @@ void pci_create_legacy_files(struct pci_bus *b)
 	b->legacy_mem->attr.mode = 0600;
 	b->legacy_mem->mmap = pci_mmap_legacy_mem;
 	/* See pci_create_attr() for motivation */
-	b->legacy_mem->llseek = pci_llseek_resource;
+	b->legacy_mem->llseek = pci_llseek_resource_legacy;
 	b->legacy_mem->f_mapping = iomem_get_mapping;
 	pci_adjust_legacy_attr(b, pci_mmap_mem);
 	error = device_create_bin_file(&b->dev, b->legacy_mem);