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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Jiri Slaby <jirislaby@gmail.com>
Cc: Uwe Bugla <uwe.bugla@gmx.de>,
	akpm@linux-foundation.org, bunk@stusta.de,
	linux-kernel@vger.kernel.org,
	Stephane Eranian <eranian@hpl.hp.com>, Andi Kleen <ak@suse.de>
Subject: Re: bug in kernel 2.6.21-rc1-git1: conventional floppy drive cannot be mounted without hanging up the whole system
Date: Mon, 26 Feb 2007 07:51:19 -0800 (PST)	[thread overview]
Message-ID: <Pine.LNX.4.64.0702260741040.12485@woody.linux-foundation.org> (raw)
In-Reply-To: <45E2F8C5.3080905@gmail.com>



On Mon, 26 Feb 2007, Jiri Slaby wrote:
> 
> Ok, this commit is the culprit:
> Commit: 2ff2d3d74705d34ab71b21f54634fcf50d57bdd5
> Author: Stephane Eranian <eranian@hpl.hp.com> Tue, 13 Feb 2007 13:26:22 +0100
> 
>     [PATCH] i386: add idle notifier

Interesting. It doesn't touch floppy at all, but it *does* seem to play 
around with irq state. 

In particular, the floppy uses IRQF_DISABLED (which means that it doesn't 
want interrupts enabled when in the irq handler), and I get the feeling 
that the poll_idle() stuff made that not work.

That said, the only thing that *really* seems to change (as far as a 
floopy driver could notice) is the added "exit_idle()" in the do_IRQ() 
sequence, and I'm not seeing that one enabling interrupts. 

But the idle sequence definitely does (ie now we disable/enable interrupts 
in cpu_idle(). I'm not seeing why that should matter, though.

Stephane, any ideas?

		Linus

  reply	other threads:[~2007-02-26 16:00 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
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 [this message]
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
2007-02-25 18:29 Uwe Bugla
2007-02-25 21:04 ` Alexey Dobriyan
2007-02-26  3:55 ` Mike Galbraith
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
2007-02-28 13:04         ` Alan
2007-02-28 12:20           ` Rene Herman

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