drm/nouveau/bar: behave better if ioremap failed

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/core/subdev/bar/base.c b/drivers/gpu/drm/nouveau/core/subdev/bar/base.c
index 73b1ed2..8bcbdf3 100644 (file)
--- a/drivers/gpu/drm/nouveau/core/subdev/bar/base.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/bar/base.c
@@ -99,8 +99,13 @@ nouveau_bar_alloc(struct nouveau_bar *bar, struct nouveau_object *parent,
                  struct nouveau_mem *mem, struct nouveau_object **pobject)
 {
        struct nouveau_object *engine = nv_object(bar);
-       return nouveau_object_ctor(parent, engine, &nouveau_barobj_oclass,
-                                  mem, 0, pobject);
+       int ret = -ENOMEM;
+       if (bar->iomem) {
+               ret = nouveau_object_ctor(parent, engine,
+                                         &nouveau_barobj_oclass,
+                                         mem, 0, pobject);
+       }
+       return ret;
 }
 
 int
@@ -118,9 +123,12 @@ nouveau_bar_create_(struct nouveau_object *parent,
        if (ret)
                return ret;
 
-       if (nv_device_resource_len(device, 3) != 0)
+       if (nv_device_resource_len(device, 3) != 0) {
                bar->iomem = ioremap(nv_device_resource_start(device, 3),
                                     nv_device_resource_len(device, 3));
+               if (!bar->iomem)
+                       nv_warn(bar, "PRAMIN ioremap failed\n");
+       }
 
        return 0;
 }