linux-kernel - Re: [patch 2.6.26] /dev/hpet

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Date:	Wed, 23 Jul 2008 09:50:25 -0700
From:	David Brownell <david-b@...bell.net>
To:	Clemens Ladisch <clemens@...isch.de>
Cc:	lkml <linux-kernel@...r.kernel.org>, bob.picco@...com,
	venkatesh.pallipadi@...el.com, Vojtech Pavlik <vojtech@...e.cz>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [patch 2.6.26] /dev/hpet - fixes and cleanup

On Wednesday 23 July 2008, David Brownell wrote:
> On Wednesday 23 July 2008, Clemens Ladisch wrote:
> > David Brownell wrote:
> > >   * Tighten and correct the userspace interface code
> > >       ...
> > >       + only open comparators that have an interrupt, and can thus
> > >         perform "real work"
> > 
> > This prevents userspace applications from doing mmap() on /dev/hpet
> > even if there is no interrupt.
> 
> OK, I removed that ... HPET_IE_ON will already fail.

This change will be included in the next version of this patch, which
I'll send after other responses get more of a chance to trickle in.
(That line already changed because of the hd_task elimination.)

--- g26.orig/drivers/char/hpet.c	2008-07-23 09:43:59.000000000 -0700
+++ g26/drivers/char/hpet.c	2008-07-23 09:03:34.000000000 -0700
@@ -189,8 +189,7 @@ static int hpet_open(struct inode *inode
 
 	for (devp = NULL, hpetp = hpets; hpetp && !devp; hpetp = hpetp->hp_next)
 		for (i = 0; i < hpetp->hp_ntimer; i++)
-			if (hpetp->hp_dev[i].hd_flags & HPET_OPEN
-					|| !hpetp->hp_dev[i].hd_hdwirq)
+			if (hpetp->hp_dev[i].hd_flags & HPET_OPEN)
 				continue;
 			else {
 				devp = &hpetp->hp_dev[i];
--
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