linux-kernel - Re: [PATCH v2 1/3] net: irda: pxaficp_ir: use sched

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Message-Id: <20150921.161235.605756522215336833.davem@davemloft.net>
Date:	Mon, 21 Sep 2015 16:12:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	robert.jarzmik@...e.fr
Cc:	samuel@...tiz.org, petr.cvek@....cz, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, arnd@...db.de
Subject: Re: [PATCH v2 1/3] net: irda: pxaficp_ir: use sched_clock() for
 time management

From: Robert Jarzmik <robert.jarzmik@...e.fr>
Date: Fri, 18 Sep 2015 18:36:56 +0200

> Which brings me to wonder which is the more correct :
>  (a) replace to reproduce the same calculation
>      Previously mtt was compared to a difference of 76ns steps (as 307ns / 4 =
>      76ns):
>      while ((sched_clock() - si->last_clk) * 76 < mtt)
> 
>  (b) change the calculation assuming mtt is in microseconds :
>      while ((sched_clock() - si->last_clk) * 1000 < mtt)
> 
> I have no IRDA protocol knowledge so unless someone points me to the correct
> calculation I'll try my luck with (b).

"a" would be "safer" and less likely to break anything, although as
you say "b" might be more correct.
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