From 0e67bed2c765ff0fdaec62c963881f5416fe3692 Mon Sep 17 00:00:00 2001 From: Ben Skeggs Date: Tue, 12 Jul 2016 11:57:07 +1000 Subject: [PATCH] drm/nouveau: check for supported chipset before booting fbdev off the hw Signed-off-by: Ben Skeggs Cc: stable@vger.kernel.org --- drivers/gpu/drm/nouveau/nouveau_drm.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c index 05915c1..6dd396f 100644 --- a/drivers/gpu/drm/nouveau/nouveau_drm.c +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c @@ -317,7 +317,16 @@ static int nouveau_drm_probe(struct pci_dev *pdev, if (vga_switcheroo_client_probe_defer(pdev)) return -EPROBE_DEFER; - /* remove conflicting drivers (vesafb, efifb etc) */ + /* We need to check that the chipset is supported before booting + * fbdev off the hardware, as there's no way to put it back. + */ + ret = nvkm_device_pci_new(pdev, NULL, "error", true, false, 0, &device); + if (ret) + return ret; + + nvkm_device_del(&device); + + /* Remove conflicting drivers (vesafb, efifb etc). */ aper = alloc_apertures(3); if (!aper) return -ENOMEM; -- 2.7.4