linux-kernel - Re: [Patch] rwsem: fix rwsem_is

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Message-ID: <16559.1254747516@redhat.com>
Date:	Mon, 05 Oct 2009 13:58:36 +0100
From:	David Howells <dhowells@...hat.com>
To:	Amerigo Wang <amwang@...hat.com>
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org,
	Brian Behlendorf <behlendorf1@...l.gov>,
	Ben Woodard <bwoodard@...l.gov>,
	Stable Team <stable@...nel.org>, akpm@...ux-foundation.org
Subject: Re: [Patch] rwsem: fix rwsem_is_locked() bug

Amerigo Wang <amwang@...hat.com> wrote:

> FYI, this seems wrong, probably even worse than what it is now.
> I tried this change, it breaks portmap.

Sorry, my mistake.  The following:

> > -	woken = 0;
> > +	woken = ++sem->activity;

should have been:

-	woken = 0;
+	woken = sem->activity++;

David
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