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Subject: Re: [PATCH v4] ata: pata_arasan_cf: Use dev_err_probe() instead
 dev_err() in data_xfer()
To:     Minjie Du <duminjie@vivo.com>, Viresh Kumar <vireshk@kernel.org>,
        Damien Le Moal <dlemoal@kernel.org>,
        "open list:LIBATA PATA DRIVERS" <linux-ide@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>
Cc:     opensource.kernel@vivo.com
References: <20230724095712.1541-1-duminjie@vivo.com>
From:   Sergei Shtylyov <sergei.shtylyov@gmail.com>
Message-ID: <a0afb702-0537-89af-2667-92186d6d3649@gmail.com>
Date:   Mon, 24 Jul 2023 13:10:37 +0300
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On 7/24/23 12:57 PM, Minjie Du wrote:

> It is possible for dma_request_chan() to return EPROBE_DEFER, which means
> acdev->host->dev is not ready yet.
> At this point dev_err() will have no output.
> 
> Signed-off-by: Minjie Du <duminjie@vivo.com>
> ---
> V1 - V4:
> Fix code format.

   I'm not seeing any fixing in v4

> ---
>  drivers/ata/pata_arasan_cf.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/ata/pata_arasan_cf.c b/drivers/ata/pata_arasan_cf.c
> index 6ab294322e79..b32d47112c0a 100644
> --- a/drivers/ata/pata_arasan_cf.c
> +++ b/drivers/ata/pata_arasan_cf.c
> @@ -529,7 +529,8 @@ static void data_xfer(struct work_struct *work)
>  	/* dma_request_channel may sleep, so calling from process context */
>  	acdev->dma_chan = dma_request_chan(acdev->host->dev, "data");
>  	if (IS_ERR(acdev->dma_chan)) {
> -		dev_err(acdev->host->dev, "Unable to get dma_chan\n");
> +		dev_err_probe(acdev->host->dev, PTR_ERR(acdev->dma_chan),

			      "Unable to get dma_chan\n");

>  		acdev->dma_chan = NULL;
>  		goto chan_request_fail;
>  	}

   That's how the dev_err_probe() continuation line shouuld be
formatted...

MBR, Sergey