linux-kernel - Re: [PATCH] rtc: max77686: fix irqf

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Message-ID: <20160218085106.GP2189@piout.net>
Date:	Thu, 18 Feb 2016 09:51:06 +0100
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Julia Lawall <julia.lawall@...6.fr>
Cc:	Valentin Rothberg <valentin.rothberg@...teo.net>,
	ldewangan@...dia.com, kbuild-all@...org, javier@....samsung.com,
	cw00.choi@...sung.com, a.zummo@...ertech.it,
	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
	kbuild test robot <fengguang.wu@...el.com>
Subject: Re: [PATCH] rtc: max77686: fix irqf_oneshot.cocci warnings

On 18/02/2016 at 17:13:18 +0900, Krzysztof Kozlowski wrote :
> On 18.02.2016 17:06, Valentin Rothberg wrote:
> > From: kbuild test robot <fengguang.wu@...el.com>
> > 
> >  Since commit 1c6c69525b40 ("genirq: Reject bogus threaded irq requests")
> >  threaded IRQs without a primary handler need to be requested with
> >  IRQF_ONESHOT, otherwise the request will fail.
> > 
> >  So pass the IRQF_ONESHOT flag in this case.
> > 
> > Generated by: scripts/coccinelle/misc/irqf_oneshot.cocci
> > 
> > CC: Laxman Dewangan <ldewangan@...dia.com>
> > Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
> > Signed-off-by: Valentin Rothberg <valentin.rothberg@...teo.net>
> > ---
> >  drivers/rtc/rtc-max77686.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> 
> Nack, because:
> 1. AFAIR this is a false positive.
> 2. Was it tested? Was it reproduced? Was the bug actually spotted or
> just coccicheck pointed this and you assumed that "request will fail"?
> 
> Coccicheck is a great tool... but not necessarily for pointing run-time
> bugs.
> 

Definitively a false positive.

Julia, I've been receiving quite a lot of those, is it possible to add a
note that this generates false positives to try to stop people from
blindly sending patches? I would have expected Valentin to know that
though.


-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com