Re: [Xenomai-help] soft lockup after 11s

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

Robert McCullough wrote:
> Hi,
> 
>  
> 
> I am using Linux 2.6.23.14 and Xenomai 2.4.2 on a MPC5200.
> 
>  
> 
> My problem is this:
> 
>  
> 
> My RTDM driver communicates to a slave device via a dual-ported RAM (DPR)
> interface.  In my module_init() I have to give the slave a SAVE command via
> the DPR.
> 
> The SAVE command stores the slave's parameters to a non-volatile memory
> (FLASH or EEPROM).  I then wait in a loop for a flag in the DPR to be set
> stating the command is complete.
> 
> The SAVE command takes about 22 seconds to complete.  Before the command
> completes I get a "BUG:  soft lock-up - CPU#0 stuck for 11s!" message.
> 
> How would I solve this problem?

Since module_init() is a non real-time context, you can safely call
schedule() in the loop.

> Is there a way to increase this 11 second timeout?

You can disable the soft-lockup detector feature, a driver which loops
for 22 seconds without yielding to the OS is a bit hard for the OS, to
say the least.

-- 
                                                 Gilles.