linux-kernel - Re: [PATCH 3/3] watchdog: xilinx: Add WDIOC

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Date:	Thu, 30 May 2013 16:34:02 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	Michal Simek <michal.simek@...inx.com>,
	linux-kernel@...r.kernel.org, Wim Van Sebroeck <wim@...ana.be>,
	linux-watchdog@...r.kernel.org
Subject: Re: [PATCH 3/3] watchdog: xilinx: Add WDIOC_SETTIMEOUT ioctl function

On 05/30/2013 04:21 PM, Guenter Roeck wrote:
> On Thu, May 30, 2013 at 04:15:45PM +0200, Michal Simek wrote:
>> On 05/30/2013 04:07 PM, Guenter Roeck wrote:
>>> On Thu, May 30, 2013 at 02:26:04PM +0200, Michal Simek wrote:
>>>> Standard watchdog programs try to setup timeout
>>>> via ioctl and this functionality should be implemented.
>>>> Timeout value is hardcoded in the hardware but
>>>> based on Documentation/watchdog/watchdog-api.txt
>>>> can return the real timeout used in the same variable.
>>>>
>>>> Signed-off-by: Michal Simek <michal.simek@...inx.com>
>>>> ---
>>>>  drivers/watchdog/of_xilinx_wdt.c | 1 +
>>>>  1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/drivers/watchdog/of_xilinx_wdt.c b/drivers/watchdog/of_xilinx_wdt.c
>>>> index 79f358c..a3bbe72 100644
>>>> --- a/drivers/watchdog/of_xilinx_wdt.c
>>>> +++ b/drivers/watchdog/of_xilinx_wdt.c
>>>> @@ -253,6 +253,7 @@ static long xwdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>>>>  		xwdt_keepalive();
>>>>  		return 0;
>>>>
>>>> +	case WDIOC_SETTIMEOUT:
>>>>  	case WDIOC_GETTIMEOUT:
>>>>  		if (no_timeout)
>>>>  			return -ENOTTY;
>>>
>>> Watchdog programs should check ident.options before trying to set the timeout.
>>> If they don't, there is an application bug. I don't think it is a good idea
>>> to start hacking the kernel to work around application bugs.
>>
>> Based on Documentation/watchdog/watchdog-api.txt
>>
>> "For some drivers it is possible to modify the watchdog timeout on the
>> fly with the SETTIMEOUT ioctl, those drivers have the WDIOF_SETTIMEOUT
>> flag set in their option field.  The argument is an integer
> 
> Yes, but WDIOF_SETTIMEOUT is not set in the driver's option field.

ok. It means I should probably enable it.

Thanks,
Michal


-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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