linux-kernel - Re: V4L2 drivers: potentially dangerous and inefficient msecs_to

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Message-ID: <4AAFE78B.6060606@gmail.com>
Date:	Tue, 15 Sep 2009 21:14:19 +0200
From:	Marcin Slusarz <marcin.slusarz@...il.com>
To:	Andreas Mohr <andi@...as.de>
CC:	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Luca Risolia <luca.risolia@...dio.unibo.it>,
	linux-media@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	jirislaby@...il.com
Subject: Re: V4L2 drivers: potentially dangerous and inefficient msecs_to_jiffies()
 calculation

Andreas Mohr pisze:
> Hi all,
> 
> ./drivers/media/video/sn9c102/sn9c102_core.c
> ,
> ./drivers/media/video/et61x251/et61x251_core.c
> and
> ./drivers/media/video/zc0301/zc0301_core.c
> do
>                             cam->module_param.frame_timeout *
>                             1000 * msecs_to_jiffies(1) );
> multiple times each.
> What they should do instead is
> frame_timeout * msecs_to_jiffies(1000), I'd think.

Or better: frame_timeout * HZ

Marcin
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