On Thu, Oct 1, 2020 at 4:33 PM Dirk Gouders <dirk@xxxxxxxxxxx> wrote:
>
> Dirk Gouders <dirk@xxxxxxxxxxx> writes:
>
> > Commit c1cf79ca5ced46 (drm/amdgpu: use IP discovery table for renoir)
> > introduced a NULL pointer dereference when booting with
> > amdgpu.discovery=0, because it removed the call of vega10_reg_base_init()
> > for that case.
> >
> > Fix this by calling that funcion if amdgpu_discovery == 0 in addition to
> > the case that amdgpu_discovery_reg_base_init() failed.
> >
> > Fixes: c1cf79ca5ced46 (drm/amdgpu: use IP discovery table for renoir)
> > Signed-off-by: Dirk Gouders <dirk@xxxxxxxxxxx>
> > Cc: Hawking Zhang <Hawking.Zhang@xxxxxxx>
> > Cc: Evan Quan <evan.quan@xxxxxxx>
> > ---
> > drivers/gpu/drm/amd/amdgpu/soc15.c | 10 +++++-----
> > 1 file changed, 5 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/soc15.c b/drivers/gpu/drm/amd/amdgpu/soc15.c
> > index 84d811b6e48b..f8cb62b326d6 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/soc15.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/soc15.c
> > @@ -694,12 +694,12 @@ static void soc15_reg_base_init(struct amdgpu_device *adev)
> > * it doesn't support SRIOV. */
> > if (amdgpu_discovery) {
> > r = amdgpu_discovery_reg_base_init(adev);
> > - if (r) {
> > - DRM_WARN("failed to init reg base from ip discovery table, "
> > - "fallback to legacy init method\n");
> > - vega10_reg_base_init(adev);
> > - }
> > + if (r == 0)
> > + break;
>
> Grrr, wrong indentation here.
> But I will wait for your review before v1.
Fixed up locally and applied. Thanks!
Alex
>
> Dirk
>
>
> > + DRM_WARN("failed to init reg base from ip discovery table, "
> > + "fallback to legacy init method\n");
> > }
> > + vega10_reg_base_init(adev);
> > break;
> > case CHIP_VEGA20:
> > vega20_reg_base_init(adev);
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