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Date: Sat, 04 Jan 2014 20:27:15 +0100
From: Philippe Gerum <rpm@xenomai.org>
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Subject: Re: [Xenomai] rtdm_task_init call freezes the system
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai@xenomai.org

On 01/04/2014 07:18 PM, Gilles Chanteperdrix wrote:
> 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.
>

The period is set to 100 ms, should be ok. Provided rtdm_wait_period() 
is properly called from that task, that is.

-- 
Philippe.