linux-kernel - Re: [PATCH 1/4] drm/v3d: Add a note about OOM vs FRDONE, which may be racing on v3.3.

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Message-ID: <CAApk1dWqPtCem_BHYVKY47TR8GtvDivY_kg0fv+w+gBZZPnNqA@mail.gmail.com>
Date:   Thu, 14 Mar 2019 11:21:50 +0000
From:   Dave Emett <david.emett@...adcom.com>
To:     Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Thomas Spurden <thomas.spurden@...adcom.com>
Subject: Re: [PATCH 1/4] drm/v3d: Add a note about OOM vs FRDONE, which may be
 racing on v3.3.

On Wed, 13 Mar 2019 at 23:52, Eric Anholt <eric@...olt.net> wrote:
>
> We deref v3d->bin_job in the work handler, but v3d->bin_job doesn't
> actually hold a ref on the job.
>
> Signed-off-by: Eric Anholt <eric@...olt.net>
Reviewed-by: Dave Emett <david.emett@...adcom.com>

> ---
>  drivers/gpu/drm/v3d/v3d_irq.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/v3d/v3d_irq.c b/drivers/gpu/drm/v3d/v3d_irq.c
> index b4d6ae81186d..a09442ec7297 100644
> --- a/drivers/gpu/drm/v3d/v3d_irq.c
> +++ b/drivers/gpu/drm/v3d/v3d_irq.c
> @@ -87,7 +87,8 @@ v3d_irq(int irq, void *arg)
>         if (intsts & V3D_INT_OUTOMEM) {
>                 /* Note that the OOM status is edge signaled, so the
>                  * interrupt won't happen again until the we actually
> -                * add more memory.
> +                * add more memory.  Also, as of V3D 4.1, FRDONE won't
> +                * be reported until any OOM state has been cleared.
Strictly speaking it's FLDONE for bins.


>                  */
>                 schedule_work(&v3d->overflow_mem_work);
>                 status = IRQ_HANDLED;
> --
> 2.20.1
>