linux-kernel - Re: 2.6.25-rc8-git2: Reported regressions from 2.6.24

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Date:	Thu, 3 Apr 2008 16:59:02 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>, Lubos Lunak <l.lunak@...e.cz>,
	Jan Kara <jack@...e.cz>, Petr Cvek <petr.cvek@....cz>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Natalie Protasevich <protasnb@...il.com>
Subject: Re: 2.6.25-rc8-git2: Reported regressions from 2.6.24



On Fri, 4 Apr 2008, Rafael J. Wysocki wrote:
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=10390
> Subject		: Oops while reading /proc/ioports or /proc/iomem
> Submitter	: Jan Kara <jack@...e.cz>
> Date		: 2008-04-03 15:25 (1 days old)
> References	: http://lkml.org/lkml/2008/4/3/149

This sounds very much like some module registered IO ports/memory and was 
then unloaded without unregistering them.

It's a bit hard to guess which module it is, though. The oops says "[last 
unloaded: parport]", so that's likely to be the area.

So I *suspect* this patch might be relevant. Bug apparently introduced in 
f63fd7e299ee13da071ecfce2b90b58c5e1562b1 ("parport_pc: detection for 
SuperIO IT87XX POST") by Petr Cvek.

Petr?

		Linus

---
 drivers/parport/parport_pc.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/parport/parport_pc.c b/drivers/parport/parport_pc.c
index d76d37b..a858089 100644
--- a/drivers/parport/parport_pc.c
+++ b/drivers/parport/parport_pc.c
@@ -1568,9 +1568,8 @@ static void __devinit detect_and_report_it87(void)
 		outb(r | 8, 0x2F);
 		outb(0x02, 0x2E);	/* Lock */
 		outb(0x02, 0x2F);
-
-		release_region(0x2e, 1);
 	}
+	release_region(0x2e, 1);
 }
 #endif /* CONFIG_PARPORT_PC_SUPERIO */
 
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