changing location of dvb-t-devices in /dev does break channel-scanning

[markus.doits@…]

i've got two dvb-t devices. on startup they are created as /dev/dvb/adapter[0,1]. sometimes on is "0", sometimes the other. since i want them to be static i simply created an udev-rule to put the devices into

/dev/dvb/adapter_terra
/dev/dvb/adapter_nova

by the udev-rule

KERNEL=="dvb*", SUBSYSTEM=="dvb", PROGRAM="/root/scripts/devicenamer.sh $name %p", NAME:="%c"

(devicenamer.sh checks the device-info and returns the correct location)

assigning the new locations in mythtv-setup works, watching tv in frontend etc. works too, but scanning for channels in mythtv-setup gives "scan type: failed to open the card" and on console

2009-05-26 14:58:52.473 FE_GET_INFO ioctl failed (/dev/dvb/adapter_nova/frontend0).

when mythtv-backend is NOT running.

starting the backend and trying to scan for channels i do not get the error (so e.g. i get "scan type: full scan") but on hitting "next" the scan also does not work and on console:

2009-05-26 15:00:50.402 DVBChan(1:/dev/dvb/adapter_nova1/frontend0) Error: Opening DVB frontend device failed.
			eno: Device or resource busy (16)

which obviously is as it should be, because the backend is accessing it.

oh and i think i did not mention before: without the udev-rule (having the devices in adapter[0,1]) channel scanning works.

i also tried symlinking with udev, no success either. in this case i cannot scan with mythtv-setup either having the symlink configured as the card nor the original device-node the symlink is pointing to. very weird.

[markus.doits@…]

there's a typo in the last quoting, it should be

2009-05-26 15:00:50.402 DVBChan(1:/dev/dvb/adapter_nova/frontend0) Error: Opening DVB frontend device failed.
			eno: Device or resource busy (16)

so not "nova1". don't know where this "1" came from (just doublechecked it).

[markus.doits@…]

oh and i am using 0.22 head svn-20616 on debian squeeze/sid x86_64... sorry, forgot this

[danielk]

This bug is not a worth fixing unless a clean and ready to apply patch is provided. No sane Linux distro would set things up like this...

[markus.doits@…]

... well, okey, but then the wiki should at least contain a hint that this breaks channel-scanning (http://www.mythtv.org/wiki/Device_Filenames_and_udev).