linux-kernel - Re: [RFC 2/4] dma: add dmaengine driver for Samsung s3c24xx SoCs

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Date:	Wed, 15 May 2013 23:20:08 +0200
From:	Sylwester Nawrocki <sylvester.nawrocki@...il.com>
To:	Heiko Stübner <heiko@...ech.de>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Dan Williams <djbw@...com>, Vinod Koul <vinod.koul@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>
Subject: Re: [RFC 2/4] dma: add dmaengine driver for Samsung s3c24xx SoCs

On 05/15/2013 10:31 PM, Heiko Stübner wrote:
>>> +       BUG();
>> >
>> >  Isn't that a bit nasty. This macro should be used with care and we
>> >  should recover if possible. dev_err()?
>
> runtime_config already denies any settings not in the 1,2 or 4bytes range -
> the default-part should therefore never be reached. So if any other value
> magically appears in the register and triggers the default-part, something is
> seriously wrong. So my guess is, the BUG might be appropriate.
>
> On the other hand the whole default+BUG part could also simply go away, for
> the same reasons.

IMHO BUG() is not needed at all. As Linus suggested dev_err() is such case
or WARN_ON() would be more appropriate. This has been discussed in the past
extensively, not sure if you are aware of the other Linus' opinion on
BUG()/BUG_ON() proliferation: https://lkml.org/lkml/2012/9/27/461

Regards,
Sylwester
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