From: Linus Torvalds <torvalds@linux-foundation.org>
To: Stephen Hemminger <shemminger@vyatta.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
linux-kernel@vger.kernel.org
Subject: Re: floppy driver assumes INITIAL_JIFFIES == 0
Date: Thu, 3 Jun 2010 14:58:17 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.2.00.1006031455280.8175@i5.linux-foundation.org> (raw)
In-Reply-To: <20100603144913.24828629@nehalam>
On Thu, 3 Jun 2010, Stephen Hemminger wrote:
>
> It seems it isn't related to initial jiffies.
> Initializing the values (though a good idea), doesn't solve the
> problem. Still failed. So dazed and confused, went back and reran
> kernel with jiffies=0 showed same problem, just took multiple boots
> to reproduce.
Ahh, ok. That really ends up limiting us. At least having a "it's related
to jiffy wraparound" was a big clue.
> So still a race that shows up with KVM (fast floppy?) and manifests
> as floppy_ready or reset_interrupt OOPS.
Yes, it's quite possible that the Linux floppy driver is simply broken by
any floppy device that basically responds immediately to a command with an
interrupt. And considering how few people use floppies, I do expect that
driver to get _worse_ rather than better in the future.
Don't get me wrong - I'm sure it could be fixed. I'm just not sure that
anybody is going to spend the effort.
I'd love to be proven wrong. Anybody?
Linus
next prev parent reply other threads:[~2010-06-03 22:03 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-03 17:15 Stephen Hemminger
2010-06-03 17:28 ` Linus Torvalds
2010-06-03 19:03 ` Stephen Hemminger
2010-06-03 19:56 ` Linus Torvalds
2010-06-03 20:59 ` Linus Torvalds
2010-06-03 21:49 ` Stephen Hemminger
2010-06-03 21:58 ` Linus Torvalds [this message]
2010-06-03 22:33 ` Linus Torvalds
2010-06-03 22:54 ` Stephen Hemminger
2010-06-03 23:09 ` Linus Torvalds
2010-06-03 23:15 ` Stephen Hemminger
2010-06-03 23:21 ` Linus Torvalds
2010-06-09 5:32 ` Stephen Hemminger
2010-06-03 22:32 ` Andreas Mohr
2010-06-03 22:40 ` Linus Torvalds
2010-06-04 15:12 ` Nick Bowler
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