drm/nouveau: fix crash with noaccel=1

Reported-by: Ortwin Glück <odi@odi.ch>
Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_abi16.c b/drivers/gpu/drm/nouveau/nouveau_abi16.c
index cc79c796afee316cd810125b93dd86fbef940d5e..cbf1fc60a38682be197dc1bb1f0f15c8853a06e6 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_abi16.c
+++ b/drivers/gpu/drm/nouveau/nouveau_abi16.c
@@ -241,6 +241,10 @@ nouveau_abi16_ioctl_channel_alloc(ABI16_IOCTL_ARGS)
 
        if (unlikely(!abi16))
                return -ENOMEM;
+
+       if (!drm->channel)
+               return nouveau_abi16_put(abi16, -ENODEV);
+
        client = nv_client(abi16->client);
 
        if (init->fb_ctxdma_handle == ~0 || init->tt_ctxdma_handle == ~0)