linux-kernel - Re: [PATCH v3 05/13] soc: mediatek: cmdq: return send msg error code

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Message-ID: <1582904349.14824.19.camel@mtksdaap41>
Date:   Fri, 28 Feb 2020 23:39:09 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <wsd_upstream@...iatek.com>,
        Bibby Hsieh <bibby.hsieh@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>,
        "Ming-Fan Chen" <ming-fan.chen@...iatek.com>
Subject: Re: [PATCH v3 05/13] soc: mediatek: cmdq: return send msg error code

Hi, Dennis:

On Fri, 2020-02-28 at 21:44 +0800, Dennis YC Hsieh wrote:
> Return error code to client if send message fail,
> so that client has chance to error handling.
> 
> Fixes: 576f1b4bc802 ("soc: mediatek: Add Mediatek CMDQ helper")
> Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>
> ---
>  drivers/soc/mediatek/mtk-cmdq-helper.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index 2e1bc513569b..0698612de5ad 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -351,11 +351,11 @@ int cmdq_pkt_flush_async(struct cmdq_pkt *pkt, cmdq_async_flush_cb cb,
>  		spin_unlock_irqrestore(&client->lock, flags);
>  	}
>  
> -	mbox_send_message(client->chan, pkt);
> +	err = mbox_send_message(client->chan, pkt);
>  	/* We can send next packet immediately, so just call txdone. */
>  	mbox_client_txdone(client->chan, 0);

If error happen, why tx is done? I think you should return immediately
when error happen.

Regards,
CK

>  
> -	return 0;
> +	return err;
>  }
>  EXPORT_SYMBOL(cmdq_pkt_flush_async);
>