linux-kernel - Re: [PATCH] mtd: nand: assign mtd->name in find_full_id

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Message-ID: <20140113074613.GI1992@norris-Latitude-E6410>
Date:	Sun, 12 Jan 2014 23:46:13 -0800
From:	Brian Norris <computersforpeace@...il.com>
To:	Caizhiyong <caizhiyong@...ilicon.com>
Cc:	Huang Shijie <b32955@...escale.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"Wanglin (Albert)" <albert.wanglin@...ilicon.com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
	Quyaxin <quyaxin@...ilicon.com>
Subject: Re: [PATCH] mtd: nand:  assign mtd->name in find_full_id_nand

On Mon, Jan 13, 2014 at 04:12:45AM +0000, Caizhiyong wrote:
> > -----Original Message-----
> > From: Brian Norris [mailto:computersforpeace@...il.com]
> > Sent: Sunday, January 12, 2014 4:10 AM
> > 
> > On Thu, Dec 26, 2013 at 10:19:39AM +0800, Huang Shijie wrote:
> > > On Thu, Dec 26, 2013 at 01:51:58AM +0000, Caizhiyong wrote:
> > > > From: Cai Zhiyong <caizhiyong@...wei.com>
> > > > Date: Wed, 25 Dec 2013 21:19:21 +0800
> > > > Subject: [PATCH] mtd: nand: assign mtd->name in find_full_id_nand
> > > >
> > > > This patch assigned the type->name to mtd->name when mtd->name is
> > > > NULL in function "find_full_id_nand".
> > > > mtd->name is NULL may cause some problem.
> > > >
> > > > Signed-off-by: Cai Zhiyong <caizhiyong@...wei.com>
> > > Acked-by: Huang Shijie <b32955@...escale.com>
> > 
> > Thanks, the patch looks good. Pushed to l2-mtd.git.
> > 
> > Wouldn't this trigger an exception when reading
> > /sys/class/mtd/mtdX/name? If so, should this be marked for stable?
> 
> View the source code, if mtd->name is NULL, cat "/sys/class/mtd/mtdX/name" will get string "(null)".
> 
> static ssize_t mtd_name_show(struct device *dev, struct device_attribute *attr, char *buf)
> {
> 	struct mtd_info *mtd = dev_get_drvdata(dev);
> 
> 	return snprintf(buf, PAGE_SIZE, "%s\n", mtd->name);
> }

Thanks, I forgot that the kernel's printf-like functions handle NULL
pointers gracefully. In that case, this probably doesn't need to be in
-stable.

Brian
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