Messages in this thread Patch in this message | | | From | Guillaume Tucker <> | Subject | [PATCH 1/2] drm/nouveau/bar/gf100: fix hang when calling ->fini() before ->init() | Date | Mon, 4 Dec 2017 18:37:58 +0000 |
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If the firmware fails to load then ->fini() will be called before the device has been initialised, causing the kernel to hang while trying to write to a register. Add a test in ->fini() to avoid this issue.
This fixes a kernel hang on tegra124.
Fixes: b17de35a2ebbe ("drm/nouveau/bar: implement bar1 teardown") Signed-off-by: Guillaume Tucker <guillaume.tucker@collabora.com> CC: Ben Skeggs <bskeggs@redhat.com> --- drivers/gpu/drm/nouveau/nvkm/subdev/bar/gf100.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bar/gf100.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bar/gf100.c index a3ba7f50198b..95e2aba64aad 100644 --- a/drivers/gpu/drm/nouveau/nvkm/subdev/bar/gf100.c +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bar/gf100.c @@ -43,9 +43,12 @@ gf100_bar_bar1_wait(struct nvkm_bar *base) } void -gf100_bar_bar1_fini(struct nvkm_bar *bar) +gf100_bar_bar1_fini(struct nvkm_bar *base) { - nvkm_mask(bar->subdev.device, 0x001704, 0x80000000, 0x00000000); + struct nvkm_device *device = base->subdev.device; + + if (base->subdev.oneinit) + nvkm_mask(device, 0x001704, 0x80000000, 0x00000000); } void -- 2.11.0
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