MIME-Version: 1.0
Date:   Wed, 08 Feb 2023 17:15:41 +0100
From:   Michael Walle <michael@walle.cc>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     linux-kernel@vger.kernel.org,
        Tudor Ambarus <tudor.ambarus@microchip.com>,
        Pratyush Yadav <pratyush@kernel.org>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Richard Weinberger <richard@nod.at>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        linux-mtd@lists.infradead.org
Subject: Re: [PATCH v4] mtd: spi-nor: fix memory leak when using
 debugfs_lookup()
In-Reply-To: <20230208160230.2179905-1-gregkh@linuxfoundation.org>
References: <20230208160230.2179905-1-gregkh@linuxfoundation.org>
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Am 2023-02-08 17:02, schrieb Greg Kroah-Hartman:
> When calling debugfs_lookup() the result must have dput() called on it,
> otherwise the memory will leak over time.  To solve this, remove the
> lookup and create the directory on the first device found, and then
> remove it when the module is unloaded.
> 
> Cc: Tudor Ambarus <tudor.ambarus@microchip.com>
> Cc: Pratyush Yadav <pratyush@kernel.org>
> Cc: Michael Walle <michael@walle.cc>
> Cc: Miquel Raynal <miquel.raynal@bootlin.com>
> Cc: Richard Weinberger <richard@nod.at>
> Cc: Vignesh Raghavendra <vigneshr@ti.com>
> Cc: linux-mtd@lists.infradead.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Reviewed-by: Michael Walle <michael@walle.cc>

one nit below I didn't notice earlier, no need to send a new
patch version just for that.

..

> +void spi_nor_debugfs_shutdown(void)
> +{
> +	if (rootdir)
> +		debugfs_remove(rootdir);

debugfs_remove() already has a check for NULL.