linux-kernel - Re: [PATCH v4] ata: pata_arasan_cf: Use dev_err_probe() instead dev_err() in data

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Message-ID: <20230724100233.zqvg6lbi7n6imobv@vireshk-i7>
Date:   Mon, 24 Jul 2023 15:32:33 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Minjie Du <duminjie@...o.com>
Cc:     Sergey Shtylyov <s.shtylyov@....ru>,
        Viresh Kumar <vireshk@...nel.org>,
        Damien Le Moal <dlemoal@...nel.org>,
        "open list:LIBATA PATA DRIVERS" <linux-ide@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        opensource.kernel@...o.com
Subject: Re: [PATCH v4] ata: pata_arasan_cf: Use dev_err_probe() instead
 dev_err() in data_xfer()

On 24-07-23, 17:57, 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@...o.com>
> ---
> V1 - V4:
> Fix code format.
> ---
>  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;
>  	}

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh