Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Thu, 9 Jan 2020 17:53:18 +0100
From:   Miquel Raynal <miquel.raynal@bootlin.com>
To:     Mason Yang <masonccyang@mxic.com.tw>
Cc:     richard@nod.at, marek.vasut@gmail.com, dwmw2@infradead.org,
        bbrezillon@kernel.org, computersforpeace@gmail.com,
        vigneshr@ti.com, juliensu@mxic.com.tw,
        linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org
Subject: Re: [PATCH v2 3/4] mtd: rawnand: Add support manufacturer specific
 suspend/resume operation
Message-ID: <20200109175318.73ab8bd7@xps13>
In-Reply-To: <1572256527-5074-4-git-send-email-masonccyang@mxic.com.tw>
References: <1572256527-5074-1-git-send-email-masonccyang@mxic.com.tw>
        <1572256527-5074-4-git-send-email-masonccyang@mxic.com.tw>
Organization: Bootlin
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8BIT
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi Mason,

Mason Yang <masonccyang@mxic.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@mxic.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@bootlin.com>


Thanks,
Miquèl