1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c
index 637afe71de56..80963d05b54a 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
@@ -177,14 +177,15 @@ bios_shadow_pci(struct nvbios *bios)
 
         if (!pci_enable_rom(pdev)) {
                 void __iomem *rom = pci_map_rom(pdev, &length);
-                if (rom) {
+                if (rom && length) {
                         bios->data = kmalloc(length, GFP_KERNEL);
                         if (bios->data) {
                                 memcpy_fromio(bios->data, rom, length);
                                 bios->length = length;
                         }
-                        pci_unmap_rom(pdev, rom);
                 }
+                if (rom)
+                        pci_unmap_rom(pdev, rom);
 
                 pci_disable_rom(pdev);
         }