linux-kernel - Re: [PATCH NAND] mtd: nand: Replace printk() with appropriate dev

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Message-ID: <20180219161216.4f3ec2f3@bbrezillon>
Date:   Mon, 19 Feb 2018 16:12:16 +0100
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Shreeya Patel <shreeya.patel23498@...il.com>
Cc:     boris.brezillon@...e-electrons.com, richard@....at,
        dwmw2@...radead.org, computersforpeace@...il.com,
        marek.vasut@...il.com, cyrille.pitchen@...ev4u.fr,
        maximlevitsky@...il.com, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, ezequiel@...guardiasur.com.ar,
        outreachy-kernel@...glegroups.com
Subject: Re: [PATCH NAND] mtd: nand: Replace printk() with appropriate
 dev_*macro()

On Mon, 19 Feb 2018 18:48:59 +0530
Shreeya Patel <shreeya.patel23498@...il.com> wrote:

> Replace printks having a log level with the appropriate
> dev_*macro.
> Also, use pdev->dev as it is guaranteed in each case to be
> properly initialized when passed into dev_*macro().
> 
> Signed-off-by: Shreeya Patel <shreeya.patel23498@...il.com>
> ---
>  drivers/mtd/nand/ams-delta.c | 6 ++++--
>  drivers/mtd/nand/cafe_nand.c | 5 +++--
>  drivers/mtd/nand/sh_flctl.c  | 2 +-
>  3 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/mtd/nand/ams-delta.c b/drivers/mtd/nand/ams-delta.c
> index dcec9cf..2419ca8 100644
> --- a/drivers/mtd/nand/ams-delta.c
> +++ b/drivers/mtd/nand/ams-delta.c
> @@ -185,7 +185,8 @@ static int ams_delta_init(struct platform_device *pdev)
>  	/* Allocate memory for MTD device structure and private data */
>  	this = kzalloc(sizeof(struct nand_chip), GFP_KERNEL);
>  	if (!this) {
> -		printk (KERN_WARNING "Unable to allocate E3 NAND MTD device structure.\n");
> +		dev_warn(&pdev->dev,
> +			 "Unable to allocate E3 NAND MTD device structure.\n");
>  		err = -ENOMEM;
>  		goto out;
>  	}
> @@ -219,7 +220,8 @@ static int ams_delta_init(struct platform_device *pdev)
>  		this->dev_ready = ams_delta_nand_ready;
>  	} else {
>  		this->dev_ready = NULL;
> -		printk(KERN_NOTICE "Couldn't request gpio for Delta NAND ready.\n");
> +		dev_notice(&pdev->dev,
> +			   "Couldn't request gpio for Delta NAND ready.\n");
>  	}
>  	/* 25 us command delay time */
>  	this->chip_delay = 30;
> diff --git a/drivers/mtd/nand/cafe_nand.c b/drivers/mtd/nand/cafe_nand.c
> index bc558c4..51f58ea 100644
> --- a/drivers/mtd/nand/cafe_nand.c
> +++ b/drivers/mtd/nand/cafe_nand.c
> @@ -773,8 +773,9 @@ static int cafe_nand_probe(struct pci_dev *pdev,
>  		cafe->nand.bbt_td = &cafe_bbt_main_descr_512;
>  		cafe->nand.bbt_md = &cafe_bbt_mirror_descr_512;
>  	} else {
> -		printk(KERN_WARNING "Unexpected NAND flash writesize %d. Aborting\n",
> -		       mtd->writesize);
> +		dev_warn(&cafe->pdev->dev,
> +			 "Unexpected NAND flash writesize %d. Aborting\n",
> +			 mtd->writesize);
>  		goto out_free_dma;

I see plenty of printk()s (or pr_xxx()s if this patch is applied after
the printk() -> pr_xxx() replacement) that are not converted to
dev_xxx() in this driver. If we start using dev_xxx() it should be used
consistently.

How about we convert all printk()s to pr_xxx()s first (what you do in
your first patch), including those you convert to dev_xxx() here, and
then we consider patching some of the drivers to use dev_xxx() instead
of pr_xxx().

>  	}
>  	cafe->nand.ecc.mode = NAND_ECC_HW_SYNDROME;
> diff --git a/drivers/mtd/nand/sh_flctl.c b/drivers/mtd/nand/sh_flctl.c
> index e7f3c98..c534c49 100644
> --- a/drivers/mtd/nand/sh_flctl.c
> +++ b/drivers/mtd/nand/sh_flctl.c
> @@ -877,7 +877,7 @@ static void flctl_cmdfunc(struct mtd_info *mtd, unsigned int command,
>  			else if (!flctl->seqin_column)
>  				execmd_write_page_sector(mtd);
>  			else
> -				printk(KERN_ERR "Invalid address !?\n");
> +				dev_err(&flctl->pdev->dev, "Invalid address !?\n");
>  			break;
>  		}
>  		set_cmd_regs(mtd, command, (command << 8) | NAND_CMD_SEQIN);



-- 
Boris Brezillon, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
http://bootlin.com