linux-kernel - Re: [PATCH v2] mtd: nxp-spifi: release flash_np in nxp_spifi

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Date:   Wed, 9 May 2018 17:03:10 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Alexey Khoroshilov <khoroshilov@...ras.ru>
Cc:     Joachim Eastwood <manabian@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        Richard Weinberger <richard@....at>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org, Julia Lawall <julia.lawall@...6.fr>,
        sil2review@...ts.osadl.org
Subject: Re: [PATCH v2] mtd: nxp-spifi: release flash_np in
 nxp_spifi_probe()

On Wed,  9 May 2018 17:56:46 +0300
Alexey Khoroshilov <khoroshilov@...ras.ru> wrote:

> nxp_spifi_probe() increments refcnt of SPI flash device node by
> of_get_next_available_child() and leaves it undecremented on both
> successful and error paths.
> 
> Found by Linux Driver Verification project (linuxtesting.org).
> 
> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
> ---
>  drivers/mtd/spi-nor/nxp-spifi.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/spi-nor/nxp-spifi.c b/drivers/mtd/spi-nor/nxp-spifi.c
> index 15374216d4d9..7b047951d0a2 100644
> --- a/drivers/mtd/spi-nor/nxp-spifi.c
> +++ b/drivers/mtd/spi-nor/nxp-spifi.c
> @@ -438,11 +438,15 @@ static int nxp_spifi_probe(struct platform_device *pdev)
>  	ret = nxp_spifi_setup_flash(spifi, flash_np);

Just put the of_node_put() here and that's the only change you'll need.

>  	if (ret) {
>  		dev_err(&pdev->dev, "unable to setup flash chip\n");
> -		goto dis_clks;
> +		goto put_np;
>  	}
>  
> +	of_node_put(flash_np);
> +
>  	return 0;
>  
> +put_np:
> +	of_node_put(flash_np);
>  dis_clks:
>  	clk_disable_unprepare(spifi->clk_spifi);
>  dis_clk_reg: