Bug 770593

Summary: udev failing to substitute $tempnode for USB devices
Product: [Fedora] Fedora Reporter: Eric Smith <spacewar>
Component: udevAssignee: udev-maint
Status: CLOSED WONTFIX QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 16CC: bradley, harald, jonathan, udev-maint
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2013-02-14 00:00:29 UTC Type: ---
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description Flags
udev rules file to demonstrate the problem
none
syslog output showing empty $tempnode substitution
none
excerpt of output from "udevadm info -e" none

Description Eric Smith 2011-12-27 20:22:39 UTC
Created attachment 549734 [details]
udev rules file to demonstrate the problem

Description of problem:

With a udev rule for a USB device with an ADD/RUN rule, plugging in the device triggers the rule, but the $tempnode substitution is an empty string rather than the correct USB node.

Version-Release number of selected component (if applicable):

udev-173-3.fc16.x86_64
kernel-3.1.6-1.fc16.x86_64

How reproducible:  100%

Steps to Reproduce:
1.  Install the attached 99-bug.rules file in /etc/udev/rules.d, changing the values for idVendor and idProduct to match a USB device you can use for testing.  This script has an echo command for debugging; normally the RUN would be for a more useful program such as fxload.
2.  Enable debugging output to syslog: "udevadm control --log-priority=debug"
3.  Plug in the device
  
Actual results:

In syslog, the echo command is shown, but the $tempnode substitution is empty.  See the attached file udev-syslog.txt for an example.

Expected results:

The $tempnode substitution should be for a proper USB node, rather than empty.

Additional info:

This worked properly for me in Fedora 14.  However, a search did reveal that Terry Barnaby apparently had this problem with Fedora 14:
    http://lists.fedoraproject.org/pipermail/users/2011-April/395767.html

I am trying to use the same product as Terry, a Xilinx "Platform Cable USB", to program FPGAs, but the problem does not seem to be specific to Xilinx.

Comment 1 Eric Smith 2011-12-27 20:23:49 UTC
Created attachment 549735 [details]
syslog output showing empty $tempnode substitution

Comment 2 Eric Smith 2011-12-27 20:25:44 UTC
Created attachment 549736 [details]
excerpt of output from "udevadm info -e"

Comment 3 Eric Smith 2011-12-27 20:27:22 UTC
Note that this was on a fresh install of Fedora 16, not an upgrade.

Comment 4 Kay Sievers 2011-12-29 13:47:42 UTC
This rule matches on the 'device' and the 'interface'. It runs for at least
2 devices at the same time. Youn need to limit that, only the 'usb_device'
has a device node, not the 'usb_interface'

Comment 5 Eric Smith 2011-12-29 18:48:38 UTC
Thanks for the suggestion, Kay.  Unfortunately I don't understand udev well enough to know how to solve it.

I only have one device with the vendor and device ID given, so I don't see how it "runs for at least 2 devices at the same time".  This worked perfectly on Fedora 14, so I don't understand why it won't work on Fedora 16.

If you could offer a more specific suggestion as to how the rule should be correctly written to avoid the problem you describe, I would greatly appreciate it!

Comment 6 Harald Hoyer 2012-01-05 10:34:13 UTC
I think the rule should contain:

SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device"

Comment 7 Bradley 2012-02-23 18:23:38 UTC
Any progress on this Bug?  I am having the same problem with a Diligent FPGA-USB cable.

Comment 8 Fedora End Of Life 2013-01-16 20:35:46 UTC
This message is a reminder that Fedora 16 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
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bug reports from releases that are no longer maintained. At that time
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Comment 9 Fedora End Of Life 2013-02-14 00:00:41 UTC
Fedora 16 changed to end-of-life (EOL) status on 2013-02-12. Fedora 16 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of 
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Thank you for reporting this bug and we are sorry it could not be fixed.