linux-kernel - Re: Question about UIO vs DT

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <87tt5lrq6h.wl-kuninori.morimoto.gx@renesas.com>
Date: Fri, 16 May 2025 07:05:27 +0000
From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: Linux-Kernel <linux-kernel@...r.kernel.org>,
	devicetree@...r.kernel.org,
	shimoda <yoshihiro.shimoda.uh@...esas.com>,
	goda <yusuke.goda.sx@...esas.com>,
	Kurokawa <harunobu.kurokawa.dn@...esas.com>,
	Kihara <takeshi.kihara.df@...esas.com>,
	kazuya.mizuguchi.ks@...esas.com,
	takamitsu.honda.pv@...esas.com
Subject: Re: Question about UIO vs DT


Hi Greg

Thank you for your help

> > > > (A)	[1 reg, 1 IRQ] UIO
> > > > (B)	[1 reg, 1 IRQ] UIO
> > > > (C)	[0 reg, 1 IRQ] UIO
> > > > 
> > > > and (C) will be DT error. Is this known issue ? Do we have better solution ?
> > > 
> > > Yes, write a real driver for the device as obviously it is a complex one
> > > and UIO shouldn't be used for it :)
> > > 
> > > What type of device is this that requires this type of hardware control
> > > and why do you feel that UIO is the proper solution?
> > 
> > One of big reason is license.
> > Because it needs to be proprietary licensed driver, we can't create
> > real driver.
> 
> That is not a valid reason at all, sorry.  So much so that I, and many
> others, have argued that you can not have UIO drivers in userspace that
> are NOT also released under the GPLv2.
> 
> Go work with your lawyers please, there's nothing I can now do to help
> you out with this due to the expectation that you are attempting to
> evade the license requirements here.

OK, Thank you for clearing details and helping us.
I will forward this info to the relatead members.

Thank you for your help !!

Best regards
---
Kuninori Morimoto