[linux-dvb] Howto automatically load saa7134-dvb?

Johannes Stezenbach js at linuxtv.org
Mon Mar 13 21:55:25 CET 2006

On Mon, Mar 13, 2006, Ole Reinartz wrote:
> I'm struggling to automate the loading of saa7134-dvb for my Avermedia 777.
> I'm using Jose Alberto Reguero's patch to get the 777 working, and it is 
> working well. However, whenever the system starts up, it detects the 
> card and loads the saa7134 module, but not the saa7134-dvb. After I 
> modprobe this module, everything is ok.
> Is that working automatically at someones system? How can that be done?
> Now I searched the source for a reason and found out that someone 
> (probably Gerd Knorr himself) added a mechanism to load the saa7134-dvb 
> from the saa7134 whenever that detects a dvb- card.
> The saa7134-dvb is dependent on saa7134, so it cannot be loaded while 
> the saa7134 itself is being loaded. So the code registers a notifier to 
> get notified after it got 'live' (i.e. its state changed to 
> MODULE_STATE_LIVE) I guess. And this notifier never gets called.
> Looking in module.c (of kernel 2.6.15, which is the kernel I use) I find 
> that in sys_init_module() the notification mechanism is called only 
> before the module actually gets initialised, but not after that. That 
> confuses me a bit. Does someone know how this is going to work? Can the 
> module somehow act at the time it got 'live'?

Well, I reported a bug (modprobe saa7134 deadlocked) which
lead to some discussion on lkml and finally Gerd's changes.
I suggest you look up the date of Gerd's change from the
hg or cvs history, and then search for the lkml discussion
around that time. Probably a piece of code from the module
notification stuff went missing. It would be nice to get
this fixed.


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