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From: Roland Dreier <rdreier@cisco.com>
To: Nathan Lynch <ntl@pobox.com>
Cc: Christoph Hellwig <hch@infradead.org>,
	Hoang-Nam Nguyen <hnguyen@linux.vnet.ibm.com>,
	linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
	openfabrics-ewg@openib.org, openib-general@openib.org,
	raisch@de.ibm.com
Subject: Re: [PATCH/RFC 2.6.21 3/5] ehca: completion queue: remove use of do_mmap()
Date: Thu, 11 Jan 2007 11:56:18 -0800	[thread overview]
Message-ID: <adaodp5ibh9.fsf@cisco.com> (raw)
In-Reply-To: <20070111194054.GA11770@localdomain> (Nathan Lynch's message of "Thu, 11 Jan 2007 13:40:54 -0600")

 > >  	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.

  parent reply	other threads:[~2007-01-11 19:56 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-11 19:08 Hoang-Nam Nguyen
2007-01-11 19:20 ` Christoph Hellwig
2007-01-11 19:40   ` Nathan Lynch
2007-01-11 19:43     ` Christoph Hellwig
2007-01-11 19:56     ` Roland Dreier [this message]
2007-01-12 15:23       ` Hoang-Nam Nguyen
2007-01-12 15:36   ` Hoang-Nam Nguyen

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