linux-kernel - Re: [PATCH/RFC 2.6.21 3/5] ehca: completion queue: remove use of do

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Message-ID: <adaodp5ibh9.fsf@cisco.com>
Date:	Thu, 11 Jan 2007 11:56:18 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	Nathan Lynch <ntl@...ox.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Hoang-Nam Nguyen <hnguyen@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	openfabrics-ewg@...nib.org, openib-general@...nib.org,
	raisch@...ibm.com
Subject: Re: [PATCH/RFC 2.6.21 3/5] ehca: completion queue: remove use of do_mmap()

 > >  	spin_lock_irqsave(&ehca_cq_idr_lock, flags);
 > >  	while (my_cq->nr_callbacks)
 > >  		yield();

 > Isn't that code outright buggy?  Calling into the scheduler with a
 > spinlock held and local interrupts disabled...

Yes, absolutely -- if nr_callbacks is ever nonzero then this will
obviously crash instantly.

 - R.
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