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Date: Thu, 14 Jan 2010 16:35:23 +0100
From: Andreas Besse <besse@motama.com>
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To: linux-media@vger.kernel.org
Subject: Order of dvb devices
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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?