linux-kernel - Re: [PATCH] phy: mediatek: fix returning garbage

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Message-ID: <40cf026f-61db-2fe0-f941-bfe5c9aa20e7@gmail.com>
Date:   Fri, 14 Apr 2023 17:46:19 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Tom Rix <trix@...hat.com>, chunkuang.hu@...nel.org,
        p.zabel@...gutronix.de, chunfeng.yun@...iatek.com,
        vkoul@...nel.org, kishon@...nel.org,
        angelogioacchino.delregno@...labora.com, nathan@...nel.org,
        ndesaulniers@...gle.com, granquet@...libre.com
Cc:     dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] phy: mediatek: fix returning garbage



On 14/04/2023 17:43, Matthias Brugger wrote:
> 
> 
> On 14/04/2023 14:22, Tom Rix wrote:
>> clang reports
>> drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c:298:6: error: variable
>>    'ret' is uninitialized when used here [-Werror,-Wuninitialized]
>>          if (ret)
>>              ^~~
>> ret should have been set by the preceding call to mtk_hdmi_pll_set_hw.
>>
>> Fixes: 45810d486bb4 ("phy: mediatek: add support for phy-mtk-hdmi-mt8195")
>> Signed-off-by: Tom Rix <trix@...hat.com>
> 
> Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>
> 

Please also add
Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

see CA+G9fYu4o0-ZKSthi7kdCjz_kFazZS-rn17Z2NPz3=1Oayr9cw@...l.gmail.com

Regards,
Matthias

>> ---
>>   drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c | 6 +++---
>>   1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c 
>> b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
>> index abfc077fb0a8..c63294e451d6 100644
>> --- a/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
>> +++ b/drivers/phy/mediatek/phy-mtk-hdmi-mt8195.c
>> @@ -292,9 +292,9 @@ static int mtk_hdmi_pll_calc(struct mtk_hdmi_phy 
>> *hdmi_phy, struct clk_hw *hw,
>>       if (!(digital_div <= 32 && digital_div >= 1))
>>           return -EINVAL;
>> -    mtk_hdmi_pll_set_hw(hw, PLL_PREDIV, fbkdiv_high, fbkdiv_low,
>> -                PLL_FBKDIV_HS3, posdiv1, posdiv2, txprediv,
>> -                txposdiv, digital_div);
>> +    ret = mtk_hdmi_pll_set_hw(hw, PLL_PREDIV, fbkdiv_high, fbkdiv_low,
>> +                  PLL_FBKDIV_HS3, posdiv1, posdiv2, txprediv,
>> +                  txposdiv, digital_div);
>>       if (ret)
>>           return -EINVAL;