linux-kernel - Re: [PATCH -next] mtd: spinand: Fix missing unlock on error path

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Date:   Wed, 4 Jul 2018 10:25:31 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Wei Yongjun <weiyongjun1@...wei.com>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        "David Woodhouse" <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Peter Pan <peterpandong@...ron.com>,
        Frieder Schrempf <frieder.schrempf@...eet.de>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH -next] mtd: spinand: Fix missing unlock on error path

On Wed, 4 Jul 2018 08:29:39 +0000
Wei Yongjun <weiyongjun1@...wei.com> wrote:

> Add the missing unlock before return from function
> spinand_mtd_(read|write) in the error handling case.
> 
> Fixes: c898e0526fb6 ("mtd: nand: Add core infrastructure to support SPI NANDs")
> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
> ---
>  drivers/mtd/nand/spi/core.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mtd/nand/spi/core.c b/drivers/mtd/nand/spi/core.c
> index 17d207a..8ac1ba95 100644
> --- a/drivers/mtd/nand/spi/core.c
> +++ b/drivers/mtd/nand/spi/core.c
> @@ -560,12 +560,16 @@ static int spinand_mtd_read(struct mtd_info *mtd, loff_t from,
>  
>  	nanddev_io_for_each_page(nand, from, ops, &iter) {
>  		ret = spinand_select_target(spinand, iter.req.pos.target);
> -		if (ret)
> +		if (ret) {
> +			mutex_unlock(&spinand->lock);
>  			return ret;
> +		}

Why not
		if (ret)
			break;

?

>  
>  		ret = spinand_ecc_enable(spinand, enable_ecc);
> -		if (ret)
> +		if (ret) {
> +			mutex_unlock(&spinand->lock);
>  			return ret;
> +		}

Ditto.

>  
>  		ret = spinand_read_page(spinand, &iter.req, enable_ecc);
>  		if (ret < 0 && ret != -EBADMSG)
> @@ -609,11 +613,11 @@ static int spinand_mtd_write(struct mtd_info *mtd, loff_t to,
>  	nanddev_io_for_each_page(nand, to, ops, &iter) {
>  		ret = spinand_select_target(spinand, iter.req.pos.target);
>  		if (ret)
> -			return ret;
> +			break;
>  
>  		ret = spinand_ecc_enable(spinand, enable_ecc);
>  		if (ret)
> -			return ret;
> +			break;
>  
>  		ret = spinand_write_page(spinand, &iter.req);
>  		if (ret)
>