[mythtv-users] LIRC kernel strangeness with more than four devices

Ramin K ramin-list at badapple.net
Tue Apr 12 18:01:03 UTC 2011

On 4/12/2011 9:23 AM, Jarod Wilson wrote:
> On Apr 11, 2011, at 8:18 PM, Ramin K wrote:
>> 	I had been playing around with four HDPVRs attached to single machine
>> and all was well. Once I attached the fifth the kernel started
>> complaining loudly and a sixth took the machine completely down.
>> 	After I bit of tail chasing I tracked it down to
>> lirc/drivers/lirc_dev/lirc_dev.h which sets
>> #define MAX_IRCTL_DEVICES 4
>> 	Doing a bit of research it appears this is an arbitrary limit since it
>> used to be 2 and it was simple to raise it to 4.
> Yeah, looks like it could be trivially increased, all it would do is waste
> a tiny bit of memory. That area of code could actually use some further
> love to make the irctl storage dynamically expand as needed.

	Thanks for looking at the code. It appeared that changing it to 8 or 12 
should be simple, but having a second opinion makes me feel better.
	I was hesitant to push upstream for a max of 8 or 12 since I'm 
definitely not the average user. A dynamic expand sounds like a much 
better and longer term solution.


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