On 04/12/17 18:37, Guillaume Tucker wrote:
> 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@xxxxxxxxxxxxx>
> CC: Ben Skeggs <bskeggs@xxxxxxxxxx>
> ---
> 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
I have tested this and it works for me. Thanks for fixing this! Would be
good to get Ben's ACK, but you can have my ...
Tested-by: Jon Hunter <jonathanh@xxxxxxxxxx>
Cheers
Jon
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