linux-kernel - Re: [PATCH] drm/radeon: properly initialize r600_audio_status() data

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Date:   Mon, 18 Sep 2017 22:53:05 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Christian Koenig <christian.koenig@....com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Alex Deucher <alexander.deucher@....com>,
        David Airlie <airlied@...ux.ie>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/radeon: properly initialize r600_audio_status() data

On Sat, Sep 16, 2017 at 8:20 AM, Christian König
<ckoenig.leichtzumerken@...il.com> wrote:
> Am 15.09.2017 um 22:06 schrieb Arnd Bergmann:
>>
>> The structure returned from r600_audio_status() is only partially
>> initialized, and older gcc versions (4.3 and 4.4) warn about this:
>>
>> drivers/gpu/drm/radeon/r600_hdmi.c: In function 'r600_audio_status':
>> drivers/gpu/drm/radeon/r600_hdmi.c:108: error: 'status.id' is used
>> uninitialized in this function
>> drivers/gpu/drm/radeon/r600_hdmi.c:108: error: 'status.connected' is used
>> uninitialized in this function
>> drivers/gpu/drm/radeon/r600_hdmi.c:108: error: 'status.offset' is used
>> uninitialized in this function
>>
>> This is harmless and surprisingly correct in C99, as the caller
>> only accesses the fields that got initialized, so newer compilers
>> don't warn about it, but initializing the entire structure feels
>> like the right thing to do here and avoids the warning.
>>
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>
>
> Reviewed-by: Christian König <christian.koenig@....com>

Applied.  thanks!

Alex

>
>> ---
>>   drivers/gpu/drm/radeon/r600_hdmi.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/radeon/r600_hdmi.c
>> b/drivers/gpu/drm/radeon/r600_hdmi.c
>> index e82a99cb2459..ab32830c4e23 100644
>> --- a/drivers/gpu/drm/radeon/r600_hdmi.c
>> +++ b/drivers/gpu/drm/radeon/r600_hdmi.c
>> @@ -58,7 +58,7 @@ enum r600_hdmi_iec_status_bits {
>>     static struct r600_audio_pin r600_audio_status(struct radeon_device
>> *rdev)
>>   {
>> -       struct r600_audio_pin status;
>> +       struct r600_audio_pin status = {};
>>         uint32_t value;
>>         value = RREG32(R600_AUDIO_RATE_BPS_CHANNEL);
>
>
>
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> amd-gfx@...ts.freedesktop.org
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