linux-kernel - Re: [PATCH 1/4] parport: modify parport subsystem to use devicemodel

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Message-ID: <20150415102804.GA3803@sudip-PC>
Date:	Wed, 15 Apr 2015 15:58:04 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Jonathan Corbet <corbet@....net>, Jean Delvare <jdelvare@...e.de>,
	Wolfram Sang <wsa@...-dreams.de>,
	Willy Tarreau <willy@...a-x.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	linux-i2c@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH 1/4] parport: modify parport subsystem to use devicemodel

On Wed, Apr 15, 2015 at 12:45:00PM +0300, Dan Carpenter wrote:
> On Wed, Apr 15, 2015 at 02:50:55PM +0530, Sudip Mukherjee wrote:
> > <snip>
> > > > +	tmp->name = name;
> > > 
> > > I wonder who frees this name variable.  My concern is that it gets
> > > freed before we are done using it or something.  (I have not looked at
> > > the details).
> > it will be done in free_port() the release callback of parport device.
> 
> That doesn't work.  Some of the callers pass a string literal.
oops, when i replied to your first mail about this I looked at
parport_register_port(), but the one that you have mentioned is the one
I gave in parport_register_dev() and it seems that the name is not freed
anywhere except the driver that has called parport_register_device() or
parport_register_dev(). I think I should better copy it and then give it
to tmp->name and free it also in the unregister function. And this should
be fixed in the original parport_register_device() also.
I will wait for some more reviews send the v2 series tomorrow.

regards
sudip

> 
> regards,
> dan carpenter
> 
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