Re: [PATCH v5 02/16] drm/msm/dpu: fix error condition in dpu_encoder_virt_atomic_mode_set

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On Fri, 12 Jul 2024 at 22:41, Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx> wrote:
> On 6/24/2024 2:13 PM, Dmitry Baryshkov wrote:
> > The commit b954fa6baaca ("drm/msm/dpu: Refactor rm iterator") removed
> > zero-init of the hw_ctl array, but didn't change the error condition,
> > that checked for hw_ctl[i] being NULL. Use indices check instead.
> >
> > Fixes: b954fa6baaca ("drm/msm/dpu: Refactor rm iterator")
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
> > ---
> >   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > index 5d205e09cf45..7613005fbfea 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > @@ -1186,7 +1186,7 @@ static void :tag(struct drm_encoder *drm_enc,
> >                       return;
> >               }
> >
> > -             if (!hw_ctl[i]) {
> > +             if (i >= num_ctl) {
>
> This is not very clear to me.
>
> How will we hit this condition? I dont see i going beyond 1 in this loop
> and neither should num_ctl

Why? the driver doesn't support flushing through a single CTL, so
num_ctl = num_intf.

>
> Will it be just easier to bring back the NULL assignment at the top?
>
> struct dpu_hw_blk *hw_ctl[MAX_CHANNELS_PER_ENC] = { NULL };
>
> I also see the same issue for other blocks such as hw_dsc, hw_lm

Other blocks loop properly up to the num_resource. I'd prefer to drop
the NULL init from the DSPP init and use num_dspp instead.

>
> >                       DPU_ERROR_ENC(dpu_enc,
> >                               "no ctl block assigned at idx: %d\n", i);
> >                       return;
> >



-- 
With best wishes
Dmitry



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