[PATCH] drm/amdgpu/display: add fallthrough comment

[Liu, Zhan]

> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Alex
> Deucher
> Sent: 2019/December/05, Thursday 4:39 PM
> To: amd-gfx at lists.freedesktop.org
> Cc: Deucher, Alexander <Alexander.Deucher at amd.com>
> Subject: [PATCH] drm/amdgpu/display: add fallthrough comment
> 
> To avoid a compiler warning.
> 
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> ---
>  drivers/gpu/drm/amd/display/dc/dce/dce_aux.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
> b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
> index 191b68b8163a..f1a5d2c6aa37 100644
> --- a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
> +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
> @@ -645,6 +645,7 @@ bool dce_aux_transfer_with_retries(struct
> ddc_service *ddc,
>  			case AUX_TRANSACTION_REPLY_AUX_DEFER:
>  			case
> AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER:
>  				retry_on_defer = true;
> +				/* fall through */

I am a bit confusing here. Why a comment can avoid a compiler warning?

>  			case
> AUX_TRANSACTION_REPLY_I2C_OVER_AUX_NACK:
>  				if (++aux_defer_retries >=
> AUX_MAX_DEFER_RETRIES) {
>  					goto fail;
> --
> 2.23.0
> 
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