Re: getting udev to work with USB combo drive

[Dave Hansen <haveblue@us.ibm.com>]

On Wed, 2004-02-11 at 17:38, Greg KH wrote:
> On Sat, Feb 07, 2004 at 07:22:04PM -0800, Dave Hansen wrote:
> > I have a pretty stupid USB combo device that doesn't like to report very
> > detailed information about itself (For Google's sake, the drive is a
> > Vosonic X's Drive Pro VP-300):
> >     SYSFS_vendor="USB     "
> >     SYSFS_model="USB             "
> >     SYSFS_rev="1.00"
> > 
> > Despite that, SYSFS_serial looked good, so I decided to use it for
> > udev.  The device has an internal hard disk, and 3 media slots, so I
> > laid out 3 entries like this:
> > SYSFS_serial="0123", ID="*:0", NAME="xdrive/disk%n"
> > SYSFS_serial="0123", ID="*:1", NAME="xdrive/cf%n"
> > SYSFS_serial="0123", ID="*:2", NAME="xdrive/sm%n"
> > SYSFS_serial="0123", ID="*:3", NAME="xdrive/xd%n"
> > 
> > But, these rules never matched.  The wildcard in the ID= field appears
> > to be ignored.  Is that a bug? 
> 
> As Pat showed, this was never checked.  With his patch, it should be
> now.  Will that give you enough to match properly without needing your
> script?

It still doesn't work, but I don't think it's because of the wildcard
any more.  I can actually see that rule match in the debug output.

How important is the order in which you specify your 'FOO="bar",' rules
in udev.rules?  Don't you have to start with the specifications that are
lowest in the tree and work up from there?  The "goto try_parent" is a
pop off the stack, and you don't ever get back down to the children. 
Maybe I just missed this until now.  

Also, I think I'm getting some garbage in the SYSFS_serial variable. 
When I get down to the match_rule() area for SYSFS_serial="...", I get
some output in the debug log like this:
compare_sysfs_attribute: compare attribute 'serial' value '0A4110002CEA'
with 'HXOLL0012202323480'

But, I have no idea where HXOLL0012202323480 came from.  

'grep -r HXOLL0012202323480 /sys' comes up with nothing.

Any ideas?  Is that some memory garbage from somewhere?

--dave



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