[PATCH] phy: mediatek: fix returning garbage

[PATCH] phy: mediatek: fix returning garbage

[Tom Rix]

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@redhat.com>
---
 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;
 
-- 
2.27.0


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Re: [PATCH] phy: mediatek: fix returning garbage

[Matthias Brugger]

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@redhat.com>

Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>

> ---
>   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;
>   

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Re: [PATCH] phy: mediatek: fix returning garbage

[Matthias Brugger]

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@redhat.com>
> 
> Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
> 

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

see CA+G9fYu4o0-ZKSthi7kdCjz_kFazZS-rn17Z2NPz3=1Oayr9cw@mail.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;

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Re: [PATCH] phy: mediatek: fix returning garbage

[Nathan Chancellor]

On Fri, Apr 14, 2023 at 08:22:53AM -0400, 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@redhat.com>

Reviewed-by: Nathan Chancellor <nathan@kernel.org>

Angelo brought up a good point on another patch to fix this issue that
we should probably be returning ret instead of unconditionally returning
-EINVAL but it sounds like it does not really matter at the moment since
mtk_hdmi_pll_set_hw() can only return -EINVAL or 0.

https://lore.kernel.org/ada769e0-0141-634f-3753-eb3a50f0eee3@collabora.com/

> ---
>  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;
>  
> -- 
> 2.27.0
> 

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Re: [PATCH] phy: mediatek: fix returning garbage

[AngeloGioacchino Del Regno]

Il 14/04/23 14:22, Tom Rix ha scritto:
> 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@redhat.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>



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Re: [PATCH] phy: mediatek: fix returning garbage

[Vinod Koul]

On 14-04-23, 08:22, 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.

I have applied "phy: mediatek: hdmi: mt8195: fix uninitialized variable
usage in pll_calc"
-- 
~Vinod

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Re: [PATCH] phy: mediatek: fix returning garbage

[Matthias Brugger]

On 05/05/2023 11:28, Vinod Koul wrote:
> On 14-04-23, 08:22, 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.
> 
> I have applied "phy: mediatek: hdmi: mt8195: fix uninitialized variable
> usage in pll_calc"

Thanks Vinod, that was on my list for today as well. I was a bit puzzled because 
you took the patch that added it, but I wasn't sure if you would take the fix. 
How do you want to handle things like this in the future?

Regards,
Matthias

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