From: Stefan Richter <stefanr@s5r6.in-berlin.de>
To: linux-kernel@vger.kernel.org
Cc: linux1394-devel@lists.sourceforge.net,
Robert Crocombe <rcrocomb@ieee.org>
Subject: Re: [RFT PATCH] ieee1394: ohci1394: serialize reset requests and irq handler
Date: Fri, 26 Jan 2007 19:39:54 +0100 [thread overview]
Message-ID: <45BA4AFA.1080106@s5r6.in-berlin.de> (raw)
In-Reply-To: <tkrat.5ef766da36a4a03a@s5r6.in-berlin.de>
I wrote:
> - Use the ohci->event_lock to serialize the trigger for software-
> enforced bus resets against a large portion of the IRQ handler.
...
> Todo:
> - Test.
> - Audit *all* of ohci1394's register accesses for the need of
> serialization by spinlocks + mmiowb.
...
PS: AFAIU what I'm doing here, it affects
- bus resets triggered by local software (the bug report was also
about externally triggered bus resets),
- and potentially bus resets (even externally triggered ones) on SMP
systems with (PCI) bridges if the IRQ handler migrates to a another
CPU between two interrupt events in quick succession.
Can the latter happen in Linux or/and with -rt kernels?
--
Stefan Richter
-=====-=-=== ---= ==-=-
http://arcgraph.de/sr/
prev parent reply other threads:[~2007-01-26 18:40 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-26 18:00 Stefan Richter
2007-01-26 18:39 ` Stefan Richter [this message]
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