Am Samstag, den 16.01.2010, 00:00 +0100 schrieb Oliver Endriss: > Devin Heitmueller wrote: > > On Thu, Jan 14, 2010 at 11:01 AM, Andreas Besse <besse@xxxxxxxxxx> 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 > Agreed. Hermann -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
