[Intel-gfx] [PATCH] drm/i915: Warn about aux msg buffer vs. size mismatch

[Daniel Vetter]

On Thu, Jul 28, 2016 at 05:55:04PM +0300, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> If we have have a buffer, we should also have a size, and vice versa.
> Let's check it both ways instead of just one.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
>  drivers/gpu/drm/i915/intel_dp.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 21b04c3eda41..001f74fc0ce5 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1041,10 +1041,10 @@ intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
>  		if (WARN_ON(txsize > 20))
>  			return -E2BIG;
>  
> +		WARN_ON(!msg->buffer != !msg->size);
> +
>  		if (msg->buffer)
>  			memcpy(txbuf + HEADER_SIZE, msg->buffer, msg->size);
> -		else
> -			WARN_ON(msg->size);
>  
>  		ret = intel_dp_aux_ch(intel_dp, txbuf, txsize, rxbuf, rxsize);
>  		if (ret > 0) {
> -- 
> 2.7.4
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch