linux-kernel - Re: [PATCH v2 01/22] docs: fpga: add a document for Intel FPGA driver overview

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Message-ID: <20170718052228.GA10631@kroah.com>
Date:   Tue, 18 Jul 2017 07:22:28 +0200
From:   Greg KH <greg@...ah.com>
To:     Alan Tull <atull@...nel.org>
Cc:     "Luebbers, Enno" <enno.luebbers@...el.com>,
        Wu Hao <hao.wu@...el.com>, Moritz Fischer <mdf@...nel.org>,
        linux-fpga@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-api@...r.kernel.org, "Kang, Luwei" <luwei.kang@...el.com>,
        "Zhang, Yi Z" <yi.z.zhang@...el.com>,
        Xiao Guangrong <guangrong.xiao@...ux.intel.com>
Subject: Re: [PATCH v2 01/22] docs: fpga: add a document for Intel FPGA
 driver overview

On Mon, Jul 17, 2017 at 03:14:29PM -0500, Alan Tull wrote:
> > Also, we're thinking that some operations require that you first "acquire
> > ownership" of the respective device, which I believe maps more easily to
> > open() and ioctls than sysfs.
> >
> > Thanks
> > - Enno
> 
> Yes, sysfs doesn't implement open/close so there's no clean way to
> have one thing in userspace that owns the interface.  It's a shame.

No, that was by design :)