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Date: Sat, 04 Jan 2014 19:18:48 +0100
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai] rtdm_task_init call freezes the system
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To: Philippe Gerum <rpm@xenomai.org>
Cc: xenomai@xenomai.org

On 01/04/2014 10:06 AM, Philippe Gerum wrote:
> On 01/04/2014 01:48 AM, Nima Nourozi wrote:
>> I'm writing an SPI device driver using rtdm skin. If I call rtdm_task_init
>> from anywhere in the code the system freezes indefinitely with no errors
>> thrown.
>>
>> Here is how I call the function in __init function of my module:
>> retval = rtdm_task_init(&heartbeat_task, "spi_transfer", xx_start_transfer,
>> NULL, 99, 100000000);
>>
>> I'm using xenomai 2.6.1 patched with
>> adeos-ipipe-2.6.38.8-arm-1.18-09.patch<http://download.gna.org/adeos/patches/v2.6/arm/adeos-ipipe-2.6.38.8-arm-1.18-09.patch>
>> Linux 2.6.38.8 and my compiler is Sourcery G++ Lite 2010q1-202
>>
>> The rtdm_timer_start function works perfectly so the problem is only with
>> the task function.
>>
>> I've been trying different kernel versions but I get the same result.
>>
>> I'm attaching the .config file in case there is a setting that's causing
>> this issue.
>>
> 
> Check your own code in xx_start_transfer. It is likely running away, 
> locking up the system. Enabling CONFIG_XENO_OPT_WATCHDOG may help.
> 

If it is periodic, chances are the period is too short.

-- 
                                                                Gilles.