linux-kernel - Re: [char-misc 3.10] mei: nfc: fix nfc device freeing

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Date:	Thu, 6 Jun 2013 11:46:32 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	"Winkler, Tomas" <tomas.winkler@...el.com>
Cc:	"arnd@...db.de" <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [char-misc 3.10] mei: nfc: fix nfc device freeing

On Thu, Jun 06, 2013 at 07:57:24AM +0000, Winkler, Tomas wrote:
> 
> > 
> > On Mon, Jun 03, 2013 at 09:28:30AM +0300, Tomas Winkler wrote:
> > > The nfc_dev is a static variable and is not cleaned properly upon
> > > reset mainly ndev->cl and ndev->cl_info are not set to NULL after
> > > freeing which
> > 
> > Then it needs to be made dynamic, don't paper over the bug by zeroing it
> > out, you really have a much larger issue here that just hasn't hit you yet.
> > 
> > No 'struct device' should ever be in a static variable, please fix this properly.
> 
> Greg,  I was looking into it and as in realistic configuration is we
> are fine as there is only one possible MEI NFC device on whole system.
> nfc_dev is also not 'a struct device' type is a singleton then holds NFC configuration.

Ah, you are right, my mistake, I would have expected something that
ended with _dev to be a device :)

> Currently changing the behavior would require rather a larger fix and
> this oneliner  effectively fixes the crash.
> 
> I don't mind to fix it properly but we are already in rc3, let us know
> what path to go. 

Can you resend this so I can apply it?

thanks,

greg k-h
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