linux-kernel - Re: [PATCH] wan: dscc4: use msecs_to

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Message-Id: <20150607.001351.1615444562432115091.davem@davemloft.net>
Date:	Sun, 07 Jun 2015 00:13:51 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hofrat@...dl.org
Cc:	romieu@...zoreil.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] wan: dscc4: use msecs_to_jiffies for conversions

From: Nicholas Mc Guire <hofrat@...dl.org>
Date: Sat,  6 Jun 2015 10:41:06 +0200

> API compliance scanning with coccinelle flagged:
> ./drivers/net/wan/dscc4.c:1036:1-33:
>         WARNING: timeout (10) seems HZ dependent
> ./drivers/net/wan/dscc4.c:554:2-34:
>         WARNING: timeout (10) seems HZ dependent
> ./drivers/net/wan/dscc4.c:599:2-34:
>         WARNING: timeout (10) seems HZ dependent
> 
> Numeric constants passed to schedule_timeout_*() make the effective
> timeout HZ dependent which does not seem to be the intent here.
> Fixed up by converting the constant to jiffies with msecs_to_jiffies()
> 
> Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>

Whoever wrote these things probably wanted whatever this amounts
to when HZ=100, so that is the only valid transformation you can
make to fix this up here.

Otherwise you seriously risk breaking the driver.
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