linux-kernel - Re: [PATCH v5 01/58] mtd: nand: denali: add missing nand_release() call in denali

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Date:	Fri, 11 Dec 2015 16:10:08 +0100
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	linux-mtd@...ts.infradead.org
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
	Hartley Sweeten <hsweeten@...ionengravers.com>,
	Ryan Mallon <rmallon@...il.com>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Imre Kaloz <kaloz@...nwrt.org>,
	Krzysztof Halasa <khalasa@...p.pl>,
	Tony Lindgren <tony@...mide.com>, linux-omap@...r.kernel.org,
	Alexander Clouter <alex@...riz.org.uk>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Andrew Lunn <andrew@...n.ch>, Daniel Mack <daniel@...que.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>,
	Marek Vasut <marek.vasut@...il.com>,
	Steven Miao <realmz6@...il.com>,
	Mikael Starvik <starvik@...s.com>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	linux-cris-kernel@...s.com,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Wan ZongShun <mcuos.com@...il.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	linux-samsung-soc@...r.kernel.org,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>, linux-sunxi@...glegroups.com,
	Stefan Agner <stefan@...er.ch>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org, Dinh Nguyen <dinguyen@...era.com>,
	Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH v5 01/58] mtd: nand: denali: add missing nand_release()
 call in denali_remove()

+ Dinh (who made commit 2a0a288ec258)

Also added back the Fixes tag.

On Fri, 11 Dec 2015 15:02:34 +0100
Boris Brezillon <boris.brezillon@...e-electrons.com> wrote:

> Unregister the NAND device from the NAND subsystem when removing a denali
> NAND controller, otherwise the MTD attached to the NAND device is still
> exposed by the MTD layer, and accesses to this device will likely crash
> the system.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

Fixes: 2a0a288ec258 ("mtd: denali: split the generic driver and PCI layer")

> ---
> Changes since v4:
> - remove Cc stable and fixes tags
> - calculate the dma buffer size before calling nand_release()
> 
>  drivers/mtd/nand/denali.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
> index 67eb2be..fdfea05 100644
> --- a/drivers/mtd/nand/denali.c
> +++ b/drivers/mtd/nand/denali.c
> @@ -1622,9 +1622,11 @@ EXPORT_SYMBOL(denali_init);
>  /* driver exit point */
>  void denali_remove(struct denali_nand_info *denali)
>  {
> +	int bufsize = denali->mtd.writesize + denali->mtd.oobsize;
> +
> +	nand_release(&denali->mtd);
>  	denali_irq_cleanup(denali->irq, denali);
> -	dma_unmap_single(denali->dev, denali->buf.dma_buf,
> -			 denali->mtd.writesize + denali->mtd.oobsize,
> +	dma_unmap_single(denali->dev, denali->buf.dma_buf, bufsize,
>  			 DMA_BIDIRECTIONAL);
>  }
>  EXPORT_SYMBOL(denali_remove);



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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