linux-kernel - Re: [patch 2.6.21-rc5-git 1/2] fix hotplug for legacy platform drivers

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Message-Id: <200704020939.52494.david-b@pacbell.net>
Date:	Mon, 2 Apr 2007 09:39:51 -0700
From:	David Brownell <david-b@...bell.net>
To:	Russell King <rmk+lkml@....linux.org.uk>
Cc:	Greg KH <gregkh@...e.de>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Andres Salomon <dilinger@...ian.org>
Subject: Re: [patch 2.6.21-rc5-git 1/2] fix hotplug for legacy platform drivers

On Monday 02 April 2007 3:55 am, Russell King wrote:
> On Sat, Mar 31, 2007 at 02:55:38PM -0700, David Brownell wrote:
> > --- g26.orig/drivers/pcmcia/pxa2xx_mainstone.c	2007-03-30 16:44:04.000000000 -0700
> > +++ g26/drivers/pcmcia/pxa2xx_mainstone.c	2007-03-31 14:23:56.000000000 -0700
> > @@ -175,6 +175,8 @@ static int __init mst_pcmcia_init(void)
> >  	if (!mst_pcmcia_device)
> >  		return -ENOMEM;
> >  
> > +	/* REVISIT just statically allocate the device */
> > +	mst_pcmcia_device->dev.uevent_suppress = 0;
> 
> Such a comment indicates that you clearly do not understand why these
> platform devices are dynamically allocated.
> 
> These are modules.  If they were statically allocated, then you have a
> potential oops waiting to happen if you have the right ordering of user
> accesses to sysfs coupled with an inopportune unload of such a driver -
> the memory backing the platform device will be unexpectedly released
> resulting in an access to freed memory.

OK, so I consider that issue sufficiently revisited.  :)

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