linux-kernel - Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

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

Date:	Mon, 17 Dec 2007 22:41:39 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Rene Herman <rene.herman@...il.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"David P. Reed" <dpreed@...d.com>,
	"H. Peter Anvin" <hpa@...or.com>, Paul Rolland <rol@...917.net>,
	Pavel Machek <pavel@....cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	rol@...be.net
Subject: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.


* Rene Herman <rene.herman@...il.com> wrote:

> On 17-12-07 17:12, Alan Cox wrote:
>
>> I don't think we should be offering udelay based delays at this point.
>> There are a lot of drivers to fix first. This is just one trivial example
>
> I agree. This thread's too full of people calling this outb method a 
> dumb hack. It's a well-known legacy PC thing and while in practice the 
> udelay might be a functional replacement for a majority of cases (save 
> the races you are finding) a delay proportional to the bus speed makes 
> great sense certainly when talking to hardware that itself runs 
> proportinal to the bus speed for example.
>
> So, really, how about just sticking in this minimal version for now? 
> Only switches the port to 0xed based on DMI and is all that is needed 
> to fix the actual problem. This should be minimal and no-risk enough 
> that it could also go to .24 if people want it to. It'll fix a few HP 
> laptops (I'll try and get/verify the dv6000z DMI strings as well).
>
> Ingo?
>
> Signed-off-by: Rene Herman <rene.herman@...il.com>

hm, i see this as a step backwards from the pretty flexible patch that 
David already tested. (and which also passed a few hundred bootup tests 
on my x86 test-grid)

	Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/