linux-kernel - Re: [PATCH v4 2/2] misc: open-dice: Add driver to expose DICE data to userspace

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Date:   Wed, 15 Dec 2021 15:45:41 +0000
From:   David Brazdil <dbrazdil@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Rob Herring <robh+dt@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Will Deacon <will@...nel.org>,
        Andrew Scull <ascull@...gle.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] misc: open-dice: Add driver to expose DICE data
 to userspace

On Wed, Dec 15, 2021 at 04:19:35PM +0100, Greg Kroah-Hartman wrote:
> On Wed, Dec 15, 2021 at 03:04:10PM +0000, David Brazdil wrote:
> > +	drvdata = devm_kmalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> > +	if (!drvdata)
> > +		return -ENOMEM;
> > +
> > +	*drvdata = (struct open_dice_drvdata){
> > +		.lock = __SPIN_LOCK_UNLOCKED(drvdata->lock),
> > +		.rmem = rmem,
> > +		.misc = (struct miscdevice){
> > +			.parent	= dev,
> > +			.name	= drvdata->name,
> > +			.minor	= MISC_DYNAMIC_MINOR,
> > +			.fops	= &open_dice_fops,
> > +			.mode	= 0600,
> > +		},
> > +	};
> 
> That is a lovely abuse of an implicit memcpy(), took me a while to
> realize what it was doing here...
> 
> Anyway, this all looks great to me, I'll wait for the DT maintainers to
> review the dt change before being able to take this through my tree.
> Thanks for the cleanups based on the review, the driver is now almost
> 1/3 smaller than your first version with more functionality!

Thanks, and thank your for your help!

David