Re: Failed to Create Symlinks ...

[Kay Sievers <kay.sievers@vrfy.org>]

On Sat, Nov 28, 2009 at 23:52, Chris Dellin <cdellin@gmail.com> wrote:
> I'm having some trouble recently with my installation of udev.  I
> expect it to create symlinks for a few devices, but no symlinks are
> created.  For example:
>
> udev should create a symlink, as per the rule below:
> $ grep agpgart /etc/udev/rules.d/50-udev.rules
> KERNEL="agpgart", NAME="misc/%k", SYMLINK+="%k"
>
> However, on boot, no symlink exists (although the /dev/misc/agpgart
> device is properly created).
>
> Once booted, the symlink does exist in the udev database:
> # udevadm info --export-db | grep -A 8 'P: /devices/virtual/misc/agpgart'
> P: /devices/virtual/misc/agpgart
> N: misc/agpgart
> S: agpgart
> E: UDEV_LOG=3
> E: DEVPATH=/devices/virtual/misc/agpgart
> E: MAJOR\x10
> E: MINOR\x175
> E: DEVNAME=/dev/misc/agpgart
> E: DEVLINKS=/dev/agpgart
>
> I don't quite know how to interpret the results from udevtest, but the
> results are here:
> http://dellin.net/static/temp/udevtest_output.txt
>
> A few other notes:
>  - The system is running a recent copy of Gentoo Linux.
>  - This started happening when I upgraded my kernel from 2.6.29.5 to 2.6.31.6.
>  - The /dev/video0 symlink has the same problem; it should be linked
> to /dev/v4l/video0, which is created correctly.
>
> Any ideas?

You should not swap kernel node names with symlink names. The primary
name in /dev should always match the name in /sys. In general, on
recent kernels, almost all rules with NAME= should be removed and the
kernel-provided names not be overwritten by userspace config, and only
symlinks (which do no clash with kernel names) added.

Kay