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Date: Thu, 21 Oct 2004 10:35:32 +0100
From: Christoph Hellwig <hch@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Rui Nuno Capela <rncbc@rncbc.org>, Ingo Molnar <mingo@elte.hu>,
       LKML <linux-kernel@vger.kernel.org>, Lee Revell <rlrevell@joe-job.com>,
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       Michal Schmidt <xschmi00@stud.feec.vutbr.cz>,
       Fernando Pablo Lopez-Lezcano <nando@ccrma.stanford.edu>
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.9-rc4-mm1-U8
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	Thomas Gleixner <tglx@linutronix.de>,
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On Thu, Oct 21, 2004 at 11:16:30AM +0200, Thomas Gleixner wrote:
> On Thu, 2004-10-21 at 11:12, Rui Nuno Capela wrote:
> >  [<e018e139>] queuecommand+0x70/0x7c [usb_storage] (24)
> 
> As I already pointed out, this is a problem due to up(sema) in
> queuecommand. That's one of the semaphore abuse points, which needs to
> be fixed. 
> 
> The problem is that semaphores are hold by Process A and released by
> Process B, which makes Ingo's checks trigger

Which is perfectly valid for a semaphore.

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