From: Ben Skeggs <bskeggs@redhat.com>
Date: Sat, 9 Jul 2016 00:41:01 +0000 (+1000)
Subject: drm/nouveau: prevent oops if no mmu subdev present
X-Git-Tag: v4.8-rc1~62^2~22^2~54
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=2100292c95cc1ff0d9dfebcb34d447f0acad5dd1;p=linux.git

drm/nouveau: prevent oops if no mmu subdev present

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

diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index 295e7621cc68..6164ea086819 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -430,6 +430,11 @@ nouveau_drm_load(struct drm_device *dev, unsigned long flags)
 	nouveau_vga_init(drm);
 
 	if (drm->device.info.family >= NV_DEVICE_INFO_V0_TESLA) {
+		if (!nvxx_device(&drm->device)->mmu) {
+			ret = -ENOSYS;
+			goto fail_device;
+		}
+
 		ret = nvkm_vm_new(nvxx_device(&drm->device), 0, (1ULL << 40),
 				  0x1000, NULL, &drm->client.vm);
 		if (ret)