linux-kernel - Re: [PATCH] drm/i915/intel_sdvo: mark expected switch fall-throughs

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Message-ID: <87lgjfak6l.fsf@intel.com>
Date:   Thu, 09 Nov 2017 11:13:54 +0200
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>
Cc:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        Chris Wilson <chris@...is-wilson.co.uk>
Subject: Re: [PATCH] drm/i915/intel_sdvo: mark expected switch fall-throughs

On Thu, 09 Nov 2017, Jani Nikula <jani.nikula@...ux.intel.com> wrote:
> On Wed, 08 Nov 2017, "Gustavo A. R. Silva" <garsilva@...eddedor.com> wrote:
>> In preparation to enabling -Wimplicit-fallthrough, mark switch cases
>> where we are expecting to fall through.
>>
>> Addresses-Coverity-ID: 141432
>> Addresses-Coverity-ID: 141433
>> Addresses-Coverity-ID: 141434
>> Addresses-Coverity-ID: 141435
>> Addresses-Coverity-ID: 141436
>> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
>
> Acked-by: Jani Nikula <jani.nikula@...el.com>

More explicitly, the patch looks good, but I'll give others the chance
to chime in before merging. In particular Chris has been doing plenty of
warning fixes lately.

BR,
Jani.


>
>> ---
>>  drivers/gpu/drm/i915/intel_sdvo.c | 11 ++++++-----
>>  1 file changed, 6 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
>> index 7437944..921e372 100644
>> --- a/drivers/gpu/drm/i915/intel_sdvo.c
>> +++ b/drivers/gpu/drm/i915/intel_sdvo.c
>> @@ -1327,6 +1327,7 @@ static void intel_sdvo_pre_enable(struct intel_encoder *intel_encoder,
>>  	switch (crtc_state->pixel_multiplier) {
>>  	default:
>>  		WARN(1, "unknown pixel multiplier specified\n");
>> +		/* fall through */
>>  	case 1: rate = SDVO_CLOCK_RATE_MULT_1X; break;
>>  	case 2: rate = SDVO_CLOCK_RATE_MULT_2X; break;
>>  	case 4: rate = SDVO_CLOCK_RATE_MULT_4X; break;
>> @@ -2274,15 +2275,15 @@ intel_sdvo_guess_ddc_bus(struct intel_sdvo *sdvo)
>>  	 */
>>  	switch (sdvo->controlled_output) {
>>  	case SDVO_OUTPUT_LVDS1:
>> -		mask |= SDVO_OUTPUT_LVDS1;
>> +		mask |= SDVO_OUTPUT_LVDS1; /* fall through */
>>  	case SDVO_OUTPUT_LVDS0:
>> -		mask |= SDVO_OUTPUT_LVDS0;
>> +		mask |= SDVO_OUTPUT_LVDS0; /* fall through */
>>  	case SDVO_OUTPUT_TMDS1:
>> -		mask |= SDVO_OUTPUT_TMDS1;
>> +		mask |= SDVO_OUTPUT_TMDS1; /* fall through */
>>  	case SDVO_OUTPUT_TMDS0:
>> -		mask |= SDVO_OUTPUT_TMDS0;
>> +		mask |= SDVO_OUTPUT_TMDS0; /* fall through */
>>  	case SDVO_OUTPUT_RGB1:
>> -		mask |= SDVO_OUTPUT_RGB1;
>> +		mask |= SDVO_OUTPUT_RGB1; /* fall through */
>>  	case SDVO_OUTPUT_RGB0:
>>  		mask |= SDVO_OUTPUT_RGB0;
>>  		break;

-- 
Jani Nikula, Intel Open Source Technology Center