linux-kernel - Re: [PATCH v16 1/5] soc: mediatek: cmdq: remove OR opertaion from err return

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Date:   Thu, 7 Nov 2019 14:31:46 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Bibby Hsieh <bibby.hsieh@...iatek.com>
CC:     Jassi Brar <jassisinghbrar@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Dennis-YC Hsieh <dennis-yc.hsieh@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>
Subject: Re: [PATCH v16 1/5] soc: mediatek: cmdq: remove OR opertaion from
 err return

Hi, Bibby:

On Thu, 2019-10-24 at 13:27 +0800, Bibby Hsieh wrote:
> That make debugging confuseidly when we OR two error return number.

Reviewed-by: CK Hu <ck.hu@...iatek.com>

> 
> Signed-off-by: Bibby Hsieh <bibby.hsieh@...iatek.com>
> ---
>  drivers/soc/mediatek/mtk-cmdq-helper.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index 7aa0517ff2f3..5ea509e86488 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -149,13 +149,16 @@ int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys,
>  			u16 offset, u32 value, u32 mask)
>  {
>  	u32 offset_mask = offset;
> -	int err = 0;
> +	int err;
>  
>  	if (mask != 0xffffffff) {
>  		err = cmdq_pkt_append_command(pkt, CMDQ_CODE_MASK, 0, ~mask);
> +		if (err < 0)
> +			return err;
> +
>  		offset_mask |= CMDQ_WRITE_ENABLE_MASK;
>  	}
> -	err |= cmdq_pkt_write(pkt, value, subsys, offset_mask);
> +	err = cmdq_pkt_write(pkt, value, subsys, offset_mask);
>  
>  	return err;
>  }
> @@ -197,9 +200,11 @@ static int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
>  
>  	/* insert EOC and generate IRQ for each command iteration */
>  	err = cmdq_pkt_append_command(pkt, CMDQ_CODE_EOC, 0, CMDQ_EOC_IRQ_EN);
> +	if (err < 0)
> +		return err;
>  
>  	/* JUMP to end */
> -	err |= cmdq_pkt_append_command(pkt, CMDQ_CODE_JUMP, 0, CMDQ_JUMP_PASS);
> +	err = cmdq_pkt_append_command(pkt, CMDQ_CODE_JUMP, 0, CMDQ_JUMP_PASS);
>  
>  	return err;
>  }