linux-kernel - Re: [PATCH v2 3/4] mtd: rawnand: Add support manufacturer specific suspend/resume operation

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Date:   Thu, 9 Jan 2020 17:53:18 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Mason Yang <masonccyang@...c.com.tw>
Cc:     richard@....at, marek.vasut@...il.com, dwmw2@...radead.org,
        bbrezillon@...nel.org, computersforpeace@...il.com,
        vigneshr@...com, juliensu@...c.com.tw,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: Re: [PATCH v2 3/4] mtd: rawnand: Add support manufacturer specific
 suspend/resume operation

Hi Mason,

Mason Yang <masonccyang@...c.com.tw> wrote on Mon, 28 Oct 2019 17:55:26
+0800:

> Patch nand_suspend() & nand_resume() for manufacturer specific
> suspend/resume operation.
> 
> Signed-off-by: Mason Yang <masonccyang@...c.com.tw>
> ---
>  drivers/mtd/nand/raw/nand_base.c | 9 +++++++--
>  include/linux/mtd/rawnand.h      | 2 ++
>  2 files changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
> index 5e318ff..2a9c5bb 100644
> --- a/drivers/mtd/nand/raw/nand_base.c
> +++ b/drivers/mtd/nand/raw/nand_base.c
> @@ -4323,6 +4323,8 @@ static int nand_suspend(struct mtd_info *mtd)
>  	struct nand_chip *chip = mtd_to_nand(mtd);
>  
>  	mutex_lock(&chip->lock);
> +	if (chip->_suspend)
> +		chip->_suspend(chip);

Return value should be checked!

>  	chip->suspended = 1;
>  	mutex_unlock(&chip->lock);
>  
> @@ -4338,11 +4340,14 @@ static void nand_resume(struct mtd_info *mtd)
>  	struct nand_chip *chip = mtd_to_nand(mtd);
>  
>  	mutex_lock(&chip->lock);
> -	if (chip->suspended)
> +	if (chip->suspended) {
> +		if (chip->_resume)
> +			chip->_resume(chip);
>  		chip->suspended = 0;
> -	else
> +	} else {
>  		pr_err("%s called for a chip which is not in suspended state\n",
>  			__func__);
> +	}
>  	mutex_unlock(&chip->lock);
>  }
>  
> diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
> index 2430ecd..6b14041 100644
> --- a/include/linux/mtd/rawnand.h
> +++ b/include/linux/mtd/rawnand.h
> @@ -1117,6 +1117,8 @@ struct nand_chip {
>  
>  	struct mutex lock;
>  	unsigned int suspended : 1;
> +	int (*_suspend)(struct nand_chip *chip);
> +	void (*_resume)(struct nand_chip *chip);

Please don't forget the kdoc!

>  
>  	uint8_t *oob_poi;
>  	struct nand_controller *controller;

With this fixed,
Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>


Thanks,
Miquèl