From cc90badd3c077ee18f82114988dbd53faf8f34c3 Mon Sep 17 00:00:00 2001 From: Karol Herbst Date: Tue, 12 Jul 2016 21:36:08 +0200 Subject: [PATCH] drm/nouveau/clk: Fix potential NULL pointer access when there is no fb subdev Signed-off-by: Karol Herbst Signed-off-by: Ben Skeggs --- drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c index 7102c25320fc..1defd3215ed3 100644 --- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c @@ -175,7 +175,7 @@ static int nvkm_pstate_prog(struct nvkm_clk *clk, int pstatei) { struct nvkm_subdev *subdev = &clk->subdev; - struct nvkm_ram *ram = subdev->device->fb->ram; + struct nvkm_fb *fb = subdev->device->fb; struct nvkm_pci *pci = subdev->device->pci; struct nvkm_pstate *pstate; int ret, idx = 0; @@ -190,7 +190,8 @@ nvkm_pstate_prog(struct nvkm_clk *clk, int pstatei) nvkm_pcie_set_link(pci, pstate->pcie_speed, pstate->pcie_width); - if (ram && ram->func->calc) { + if (fb && fb->ram && fb->ram->func->calc) { + struct nvkm_ram *ram = fb->ram; int khz = pstate->base.domain[nv_clk_src_mem]; do { ret = ram->func->calc(ram, khz); -- 2.20.1