linux-kernel - Re: [tpmdd-devel] [RFC PATCH 1/2] tee: generic TEE subsystem

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Message-ID: <20150420155648.GA7676@obsidianresearch.com>
Date:	Mon, 20 Apr 2015 09:56:48 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Jens Wiklander <jens.wiklander@...aro.org>,
	valentin.manea@...wei.com, devicetree@...r.kernel.org,
	javier@...igon.com, emmanuel.michel@...com,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	jean-michel.delorme@...com, tpmdd-devel@...ts.sourceforge.net,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [tpmdd-devel] [RFC PATCH 1/2] tee: generic TEE subsystem

On Mon, Apr 20, 2015 at 04:54:32PM +0200, Greg Kroah-Hartman wrote:
> On Sun, Apr 19, 2015 at 11:08:00PM -0600, Jason Gunthorpe wrote:
> > I still suspect the expected way to write a new mid layer is to create
> > your own struct device and not rely on misc_device,
> 
> Yes, that is the way.  You can not use misc_device for anything other
> than creating the char node that your driver can use through the fileops
> you pass to it.
> 
> Do not use a misc_device to create sysfs files for, or anything else, it
> will be wrong and racy, as you have pointed out.

Thanks!

Can you quickly comment on when a misc device should be used compared to
alloc_chrdev_region & cdev_add ?

Jason
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