On 03/20, Dmitry Vyukov wrote:
> vkms_vblank_simulate() uses WARN_ON for timing-dependent condition
> (timer overrun). This is a mis-use of WARN_ON, WARN_ON must be used
> to denote kernel bugs. Use pr_warn() instead.
>
> Signed-off-by: Dmitry Vyukov <dvyu...@google.com>
> Reported-by: syzbot+4fc21a003c8332eb0...@syzkaller.appspotmail.com
> Cc: Rodrigo Siqueira <rodrigosiqueiram...@gmail.com>
> Cc: Melissa Wen <melissa....@gmail.com>
> Cc: Haneen Mohammed <hamohammed...@gmail.com>
> Cc: Daniel Vetter <dan...@ffwll.ch>
> Cc: David Airlie <airl...@linux.ie>
> Cc: dri-de...@lists.freedesktop.org
> Cc: linux-kernel@vger.kernel.org
> Change-Id: I7f01c288092bc7e472ec63af198f93ce3d8c49f7
> ---
> drivers/gpu/drm/vkms/vkms_crtc.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c
> b/drivers/gpu/drm/vkms/vkms_crtc.c
> index 0443b7deeaef6..758d8a98d96b3 100644
> --- a/drivers/gpu/drm/vkms/vkms_crtc.c
> +++ b/drivers/gpu/drm/vkms/vkms_crtc.c
> @@ -18,7 +18,8 @@ static enum hrtimer_restart vkms_vblank_simulate(struct
> hrtimer *timer)
>
> ret_overrun = hrtimer_forward_now(&output->vblank_hrtimer,
> output->period_ns);
> - WARN_ON(ret_overrun != 1);
> + if (ret_overrun != 1)
> + pr_warn("%s: vblank timer overrun\n", __func__);
Hi Dmitry,
Thanks for your patch.
Looks good to me.
The Change-Id tag just seems a little noisy to me, but can be
fixed while applying.
Acked-by: Melissa Wen <melissa....@gmail.com>
>
> spin_lock(&output->lock);
> ret = drm_crtc_handle_vblank(crtc);
>
> base-commit: e94c55b8e0a0bbe9a026250cf31e2fa45957d776
> --
> 2.31.0.291.g576ba9dcdaf-goog
>
