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

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Message-ID: <20190826071048.Horde.gwS9nzceYYiYGJLnJ6-x2hz@www.vdorst.com>
Date:   Mon, 26 Aug 2019 07:10:48 +0000
From:   René van Dorst <opensource@...rst.com>
To:     Mao Wenan <maowenan@...wei.com>, sr@...x.de
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'

Let's add Stefan to the conversation.
He is the author of this commit.

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?

Greats,

René


>  	if (mtk_r32(eth, MTK_PDMA_INT_MASK) & MTK_RX_DONE_INT) {
>  		if (mtk_r32(eth, MTK_PDMA_INT_STATUS) & MTK_RX_DONE_INT)
>  			mtk_handle_irq_rx(irq, _eth);
> --
> 2.7.4