[PATCH v2 2/4] drm_vblank_get: don't WARN_ON in case vblanks are not initialized

[Alex Deucher]

On Wed, Apr 1, 2015 at 9:15 AM, Gerd Hoffmann <kraxel at redhat.com> wrote:
> Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>

Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/drm_irq.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
> index 10574a0..c631c1a 100644
> --- a/drivers/gpu/drm/drm_irq.c
> +++ b/drivers/gpu/drm/drm_irq.c
> @@ -1026,6 +1026,9 @@ int drm_vblank_get(struct drm_device *dev, int crtc)
>         unsigned long irqflags;
>         int ret = 0;
>
> +       if (!dev->num_crtcs)
> +               return -EINVAL;
> +
>         if (WARN_ON(crtc >= dev->num_crtcs))
>                 return -EINVAL;
>
> --
> 1.8.3.1
>
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