Devin Heitmueller wrote: > On Thu, Jan 14, 2010 at 10:35 AM, Andreas Besse <besse@xxxxxxxxxx> wrote: > >> if a system contains multiple DVB cards of the same type, how is the >> order of devices determined by the driver/kernel? >> >> I use 2 Technotrend S2-3200 cards in a system and observerd that if I >> load the driver driver budget_ci manually as follows: >> >> modprobe budget_ci adapter_nr=0,1 >> >> the device with the lower pci ID 0000:08:00.0 is assigned to adapter0 and the device with the higher pci ID 0000:08:01.0 >> is assigned to adapter1: >> >> >> udevinfo -a -p $(udevinfo -q path -n /dev/dvb/adapter0/frontend0) >> [...] >> looking at parent device '/devices/pci0000:00/0000:00:1e.0/0000:08:00.0': >> KERNELS=="0000:08:00.0" >> SUBSYSTEMS=="pci" >> >> >> udevinfo -a -p $(udevinfo -q path -n /dev/dvb/adapter1/frontend0) >> [...] >> looking at parent device '/devices/pci0000:00/0000:00:1e.0/0000:08:01.0': >> KERNELS=="0000:08:01.0" >> SUBSYSTEMS=="pci" >> >> >> Is it true for all DVB drives that the device with the lower PCI id gets the lower adapter name? >> > > No, you cannot really make this assumption. In fact, there are users > who see behavior where uses have two of the same card and the cards > get flipped around randomly just by rebooting. The ordering is based > on the timing of the device driver loading, so it is not > deterministic. > 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? -- 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
