Re: [ivtv-users] Unpredictable udev rule application?

[Michael Thome]

Sander Sweers wrote: On 7/10/07, Michael Thome <[EMAIL PROTECTED]> wrote: My system has one pvr-150 and one pvr-500 (very sadly, one with samsung tuners) - one of them (pvr-500, first tuner) is hooked to my cable box for digital/premium content, the others direct to analog cable. I've got udev rules to set up aliases according to physical location (pci slot / pvr-500 unit) - the rules always test fine and never create the wrong aliases, but they sometimes don't all fire, leaving me with one or more tuners missing via the aliases I'm trying to set up. The only thing I can think of is that another udev rule catches the event before yours (and I though processing stops at that point). Doesn't seem to be the case: the udev logs don't show anything like that happening. But I find it strange that the device naming is so unpredictable for you. For me it consistently creates the same device names. it only changes when I move the cards around or add a new video device. Yah - very strange.  It also really bugs me that the minor device numbers aren't stable - it blows my mind that the devices are being enumerated in a non-deterministic way.  I'm guessing that someone thought it would be cool to multi-thread the hotplug system (I'm running on an dual-core machine). Hmmmm - LKML perusal suggests that multithreaded device probing was, indeed, patched in around a year ago - it looks like the PCI patch wasn't committed until 2.6.18 (and I'm running 2.6.17).  Maybe more udev logging would help. You can try to force ivtv to start counting from a specific minor by passing ivtv_first_minor=<number> to the module, maybe this helps? Nope - the primary devices all get created correctly - the symlinks just don't work right.  Perhaps the threaded probing is causing problems with the /dev vfs - maybe a simpler scheme like /dev/mpeg[01][ab] would help.  As an aside, I also create parallel yuv, vbi, and pcm devices in the same /dev/pci/[01]/ trees - it is interesting that all the devices associated with a video unit appear or disappear together, even though they are different rules for each type (e.g. if /dev/pci/1/mpeg1 is there, /dev/pci/1/pcm1 will always be there, too). Thanks for the suggestions. I suspect that when that when I have to do an upgrade everything will change anyway, but it would be nice to understand what is going on. cheers!

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