linux-kernel - Re: [PATCH update] ieee1394: cycle timer read extension for raw1394/libraw1394

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Date:	Sat, 03 Feb 2007 15:22:00 +0100
From:	Pieter Palmers <pieterp@...w.be>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
CC:	Dan Dennedy <dan@...nedy.org>,
	linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH update] ieee1394: cycle timer read extension for	raw1394/libraw1394

Stefan Richter wrote:
> From: Pieter Palmers <pieterp@...w.be>
> 
> This implements the simultaneous read of the isochronous cycle timer and
> the system clock (in usecs).  This allows to express the exact receive
> time of an ISO packet as a system time with microsecond accuracy.
> http://bugzilla.kernel.org/show_bug.cgi?id=7773
> 
> The counterpart patch for libraw1394 can be found at
> http://thread.gmane.org/gmane.linux.kernel.firewire.devel/8934
> 
> Patch update (Stefan R.):
>   - Disable preemption and local interrupts.
>   - Fix integer overflow.
I had to use 1000000ULL instead of USEC_PER_SEC to avoid weird behavior.

>   - Add paranoid error checks and kerneldoc to hpsb_read_cycle_timer.
>     Move it to other ieee1394_core high-level API functions.
>   - Rename userspace-exported struct _raw1394_cycle_timer to
>     raw1394_cycle_timer.  Change comments in raw1394.
>   - Adjust whitespace.
Thanks for the cleanups!

I can't test it right now, but I'll report later.

Pieter
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