linux-kernel - Re: [PATCH v2 -next] net: mediatek: remove set but not used variable 'status'

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Message-ID: <ce9fd217-f838-1e04-eacd-7fe9f07dc745@denx.de>
Date:   Mon, 26 Aug 2019 09:27:08 +0200
From:   Stefan Roese <sr@...x.de>
To:     René van Dorst <opensource@...rst.com>,
        Mao Wenan <maowenan@...wei.com>
Cc:     nbd@...nwrt.org, john@...ozen.org, sean.wang@...iatek.com,
        nelson.chang@...iatek.com, davem@...emloft.net,
        matthias.bgg@...il.com, kernel-janitors@...r.kernel.org,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 -next] net: mediatek: remove set but not used variable
 'status'

Hi!

On 26.08.19 09:10, René van Dorst wrote:
> Let's add Stefan to the conversation.
> He is the author of this commit.

Thanks Rene.
  
> Quoting Mao Wenan <maowenan@...wei.com>:
> 
>> Fixes gcc '-Wunused-but-set-variable' warning:
>> drivers/net/ethernet/mediatek/mtk_eth_soc.c: In function mtk_handle_irq:
>> drivers/net/ethernet/mediatek/mtk_eth_soc.c:1951:6: warning:
>> variable status set but not used [-Wunused-but-set-variable]
>>
>> Fixes: 296c9120752b ("net: ethernet: mediatek: Add MT7628/88 SoC support")
>> Signed-off-by: Mao Wenan <maowenan@...wei.com>
>> ---
>>   v2: change format of 'Fixes' tag.
>>   drivers/net/ethernet/mediatek/mtk_eth_soc.c | 2 --
>>   1 file changed, 2 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
>> b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
>> index 8ddbb8d..bb7d623 100644
>> --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
>> +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
>> @@ -1948,9 +1948,7 @@ static irqreturn_t mtk_handle_irq_tx(int irq,
>> void *_eth)
>>   static irqreturn_t mtk_handle_irq(int irq, void *_eth)
>>   {
>>   	struct mtk_eth *eth = _eth;
>> -	u32 status;
>>
>> -	status = mtk_r32(eth, MTK_PDMA_INT_STATUS);
> 
> Hi Stefan,
> 
> You added an extra MTK_PDMA_INT_STATUS read in mtk_handle_irq()
> Is that read necessary to work properly?

No, its not needed. This read must have "slipped in" from some earlier
patch versions and I forgot to remove it later. Thanks for catching it.

Reviewed-by: Stefan Roese <sr@...x.de>

Thanks,
Stefan