linux-kernel - Re: [PATCH v2 5/6] watchdog: at91sam9: request the irq with IRQF_NO

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Date:	Mon, 02 Mar 2015 06:10:38 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Mark Rutland <mark.rutland@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	linux-pm@...r.kernel.org, Wim Van Sebroeck <wim@...ana.be>,
	linux-watchdog@...r.kernel.org,
	Alessandro Zummo <a.zummo@...ertech.it>,
	rtc-linux@...glegroups.com,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-serial@...r.kernel.org,
	Mike Turquette <mturquette@...aro.org>,
	linux-kernel@...r.kernel.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 5/6] watchdog: at91sam9: request the irq with IRQF_NO_SUSPEND

On 03/02/2015 01:18 AM, Boris Brezillon wrote:
> The watchdog interrupt (only used when activating software watchdog)
> shouldn't be suspended when entering suspend mode, because it is shared
> with a timer device (which request the line with IRQF_NO_SUSPEND) and once
> the watchdog "Mode Register" has been written, it cannot be changed (which
> means we cannot disable the watchdog interrupt when entering suspend).
>
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

Acked-by: Guenter Roeck <linux@...ck-us.net>

> ---
>   drivers/watchdog/at91sam9_wdt.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/watchdog/at91sam9_wdt.c b/drivers/watchdog/at91sam9_wdt.c
> index 6df9405..1443b3c 100644
> --- a/drivers/watchdog/at91sam9_wdt.c
> +++ b/drivers/watchdog/at91sam9_wdt.c
> @@ -208,7 +208,8 @@ static int at91_wdt_init(struct platform_device *pdev, struct at91wdt *wdt)
>
>   	if ((tmp & AT91_WDT_WDFIEN) && wdt->irq) {
>   		err = request_irq(wdt->irq, wdt_interrupt,
> -				  IRQF_SHARED | IRQF_IRQPOLL,
> +				  IRQF_SHARED | IRQF_IRQPOLL |
> +				  IRQF_NO_SUSPEND,
>   				  pdev->name, wdt);
>   		if (err)
>   			return err;
>

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