linux-kernel - Re: [PATCH v4 3/5] tee: generic TEE subsystem

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Message-ID: <20150709182525.GA27758@obsidianresearch.com>
Date:	Thu, 9 Jul 2015 12:25:25 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Jens Wiklander <jens.wiklander@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh+dt@...nel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	valentin.manea@...wei.com, jean-michel.delorme@...com,
	emmanuel.michel@...com, javier@...igon.com,
	Mark Rutland <mark.rutland@....com>,
	Michal Simek <michal.simek@...inx.com>
Subject: Re: [PATCH v4 3/5] tee: generic TEE subsystem

On Thu, Jul 09, 2015 at 02:49:08PM +0200, Jens Wiklander wrote:
> > Generally in a scheme like this we'd see open and release get/put the
> > underlying module handle to prevent driver removal while the char dev
> > is open. Otherwise module removal will hang here.
> 
> I'm perhaps misunderstanding you. While the cdev has any open file
> descriptors rmmod will fail with "Resource temporarily unavailable"
> because of fops_get() in chrdev_open().

Hmm, I see, you've done this:

+       cdev_init(&teedev->cdev, &tee_fops);
+       teedev->cdev.owner = teedesc->owner;

And owner here is the driver module? Interesting.. Looks OK..

Jason
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