linux-kernel - Re: [RFT PATCH] ieee1394: ohci1394: serialize reset requests and irq handler

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Date:	Fri, 26 Jan 2007 19:39:54 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	linux-kernel@...r.kernel.org
CC:	linux1394-devel@...ts.sourceforge.net,
	Robert Crocombe <rcrocomb@...e.org>
Subject: Re: [RFT PATCH] ieee1394: ohci1394: serialize reset requests and
 irq handler

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/
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