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

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Message-id: <56C57D1E.805@samsung.com>
Date:	Thu, 18 Feb 2016 17:13:18 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Valentin Rothberg <valentin.rothberg@...teo.net>,
	ldewangan@...dia.com
Cc:	kbuild-all@...org, alexandre.belloni@...e-electrons.com,
	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 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.

Best regards,
Krzysztof