Devin Heitmueller wrote: > On Thu, Jan 14, 2010 at 11:01 AM, Andreas Besse <be...@motama.com> wrote: > > yes if there are different drivers I already observed the behaviour that > > the ordering gets flipped after reboot. > > > > But if I assume, that there is only *one* driver that is loaded (e.g. > > budget_av) for all dvb cards in the system, how is the ordering of these > > devices determined? How does the driver "search" for available dvb cards?
The driver does not 'search' for a card. The driver registers the ids of all supported cards with the pci subsystem of the kernel. When the pci subsystem detects a new card, it calls the 'probe' routine of the driver (for example saa7146_init_one for saa7146-based cards). So the ordering is determined by the pci subsystem. > I believe your assumption is incorrect. I believe the enumeration > order is not deterministic even for multiple instances of the same > driver. It is not uncommon to hear mythtv users complain that "I have > two PVR-150 cards installed in my PC and the order sometimes get > reversed on reboot". Afaik the indeterministic behaviour is caused by udev, not by the kernel. We never had these problems before udev was introduced. CU Oliver -- ---------------------------------------------------------------- VDR Remote Plugin 0.4.0: http://www.escape-edv.de/endriss/vdr/ 4 MByte Mod: http://www.escape-edv.de/endriss/dvb-mem-mod/ Full-TS Mod: http://www.escape-edv.de/endriss/dvb-full-ts-mod/ ---------------------------------------------------------------- -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
