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From: Bill Davidsen <davidsen@tmr.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rene Herman <rene.herman@gmail.com>,
	Oleg Nesterov <oleg@tv-sign.ru>,
	Stephane Eranian <eranian@hpl.hp.com>,
	linux-kernel@vger.kernel.org
Subject: Re: bug in kernel 2.6.21-rc1-git1: conventional floppy drive cannot be mounted without hanging up the whole system
Date: Tue, 27 Feb 2007 21:42:16 -0500	[thread overview]
Message-ID: <45E4EC08.50409@tmr.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0702261308490.12485@woody.linux-foundation.org>

Linus Torvalds wrote:
> 
> On Mon, 26 Feb 2007, Rene Herman wrote:
>> Other than these two, ECP parallel ports are the other remaining users.
>> Now, even though on a machine that still has a parallel port it might usually
>> indeed be set to ECP in its BIOS; having anything attached to the port also
>> use it as such seems quite seldom.
> 
> Well, if it's some kind of cache coherency problem (the same way much more 
> modern CPU's have cache coherency issues with DMA during C3 sleep), then 
> it's entirely possible that the normal ECP parallel port behaviour would 
> never show it, since most people tend to use it for output only (yeah, I 
> realize you can use it bidirectionally, but at least on old hardware it 
> tends to be "talk AT printer" rather than "talk WITH printer".

The bidirectional use is/was PL/IP, aka "laplink" connections. Yes, I 
still have a machine I installed that way, and it will run 2.2.19 
forever before I try it again. ;-)
> 
> I frankly forget what hardware platforms had problems with the DMA thing, 
> and what the exact behaviour even was (I think there was some possibility 
> of corrupt data on the floppy). We also used to have the "nohlt" flag to 
> turn off hlt entirely, and that was due to some other legacy issues, iirc.
> 
> I seriously doubt we will ever see anybody who has this problem ever 
> again, but on the other hand, I also seriously doubt that most modern 
> machines even *have* a floppy drive any more, so I'd rather not even 
> change it. It's just not worth even a miniscule risk..

Thank you.
> 
> 		Linus


-- 
Bill Davidsen <davidsen@tmr.com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot

  reply	other threads:[~2007-02-28  2:43 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-26 18:06 Oleg Nesterov
2007-02-26 18:13 ` Linus Torvalds
2007-02-26 20:55   ` Rene Herman
2007-02-26 21:14     ` Linus Torvalds
2007-02-28  2:42       ` Bill Davidsen [this message]
2007-02-28 13:04         ` Alan
2007-02-28 12:20           ` Rene Herman
  -- strict thread matches above, loose matches on Subject: below --
2007-02-25 18:29 Uwe Bugla
2007-02-25 21:04 ` Alexey Dobriyan
2007-02-26  3:55 ` Mike Galbraith
2007-02-24 17:54 Uwe Bugla
2007-02-24 18:07 ` Andrew Morton
2007-02-24 18:29   ` Uwe Bugla
2007-02-24 19:23   ` Uwe Bugla
2007-02-24 19:49     ` Ray Lee
2007-02-26 10:38 ` Jiri Slaby
2007-02-26 15:12   ` Jiri Slaby
2007-02-26 15:51     ` Linus Torvalds
2007-02-26 16:28       ` Jiri Slaby
2007-02-26 16:34       ` Benjamin LaHaise
2007-02-26 17:10         ` Linus Torvalds
2007-02-26 17:45           ` Stephane Eranian
2007-02-26 17:28       ` Stephane Eranian
2007-02-26 17:37         ` Linus Torvalds

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