[Intel-gfx] [PATCH 41/58] drm/i915: convert pointless error checks in set_config to BUGs

[Jesse Barnes]

On Sun, 19 Aug 2012 21:12:58 +0200
Daniel Vetter <daniel.vetter at ffwll.ch> wrote:

> Because they all are, the ioctl command never calls us with any of
> these violated. Also drop a equally pointless empty debug message (and
> also in set_cursor, while we're at it).
> 
> With all these changes, intel_crtc_set_config is neatly condensed down
> to it's essence, the actual modeset code (or fb update calling code)
> 
> v2: The fb helper code is actually stretching ->set_config semantics a bit,
> it calls it with set->mode == NULL but set->fb != NULL.
> 
> Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 15 +++------------
>  1 file changed, 3 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 125443a..56827d6 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -5462,8 +5462,6 @@ static int intel_crtc_cursor_set(struct drm_crtc *crtc,
>  	uint32_t addr;
>  	int ret;
>  
> -	DRM_DEBUG_KMS("\n");
> -
>  	/* if we want to turn off the cursor ignore width and height */
>  	if (!handle) {
>  		DRM_DEBUG_KMS("cursor off\n");
> @@ -6919,16 +6917,9 @@ static int intel_crtc_set_config(struct drm_mode_set *set)
>  	int ret;
>  	int i;
>  
> -	DRM_DEBUG_KMS("\n");
> -
> -	if (!set)
> -		return -EINVAL;
> -
> -	if (!set->crtc)
> -		return -EINVAL;
> -
> -	if (!set->crtc->helper_private)
> -		return -EINVAL;
> +	BUG_ON(!set);
> +	BUG_ON(!set->crtc);
> +	BUG_ON(!set->crtc->helper_private);
>  
>  	if (!set->mode)
>  		set->fb = NULL;

The BUG_ONs are probably superfluous too, but this is an improvement.

Reviewed-by: Jesse Barnes <jbarnes at virtuousgeek.org>

-- 
Jesse Barnes, Intel Open Source Technology Center