USB driver and udev_run_devd

[Greg Huber <ghuber@vanteon.com>]

I hope this is the correct place for this...

I am currently developing a driver for a USB dongle.
My development system is based on FC6, fully up-to-date.

Everything seems to work fine until I unload the driver
(actual device still plugged in). I end up with a
"/lib/udev/udev_run_devd" process running rouge and
consuming mass amounts of CPU time. After tracing udev
events I'm speculating that there is a problem when the
system re-adds the device end-points back into the system.
(trace below)

The 51-hotplug.rules handles (by ignoring) SUBSYSTEM
types of 'module' and 'drivers' but not 'usb_endpoint'.
I'm guessing that when the rules in the hotplug container
get checked, the event with SUBSYSTEM=usb_endpoint
causes udev_run_devd to execute but there is something
missing or incorrectly configured causing it to loop infintely.

Could anyone please tell me what is really happening and
how I might prevent udev_run_devd from running (or at
least get it to exit normally).

Thank You.

Greg

 From strace of udev_run_devd

getdents64(3, /* 170 entries */, 4096)  = 4080
getdents64(3, /* 170 entries */, 4096)  = 4080
getdents64(3, /* 170 entries */, 4096)  = 4080
getdents64(3, /* 170 entries */, 4096)  = 4080
...

below is a trace from udevmonitor

UEVENT[1178825388.167826] remove@/bus/usb/drivers/DLP-D USB Security Dongle
ACTION=remove
DEVPATH=/bus/usb/drivers/DLP-D USB Security Dongle
SUBSYSTEM=drivers
SEQNUM\x1220

UEVENT[1178825388.168538] remove@/module/dlpd/drivers
ACTION=remove
DEVPATH=/module/dlpd/drivers
SUBSYSTEM=module
SEQNUM\x1221

UEVENT[1178825388.169668] remove@/module/dlpd
ACTION=remove
DEVPATH=/module/dlpd
SUBSYSTEM=module
SEQNUM\x1222

UDEV  [1178825388.174263] remove@/class/usb_endpoint/usbdev4.6_ep81
UDEV_LOG=3
ACTION=remove
DEVPATH=/class/usb_endpoint/usbdev4.6_ep81
SUBSYSTEM=usb_endpoint
SEQNUM\x1216
MAJOR%3
MINOR%
UDEVD_EVENT=1
DEVNAME=/dev/usbdev4.6_ep81

UDEV  [1178825388.186712] remove@/class/usb_endpoint/usbdev4.6_ep02
UDEV_LOG=3
ACTION=remove
DEVPATH=/class/usb_endpoint/usbdev4.6_ep02
SUBSYSTEM=usb_endpoint
SEQNUM\x1217
MAJOR%3
MINOR&
UDEVD_EVENT=1
DEVNAME=/dev/usbdev4.6_ep02

UDEV  [1178825388.193601] remove@/class/usb
UDEV_LOG=3
ACTION=remove
DEVPATH=/class/usb
SUBSYSTEM=class
SEQNUM\x1215
UDEVD_EVENT=1

UDEV  [1178825388.199113] add@/class/usb_endpoint/usbdev4.6_ep81
UDEV_LOG=3
ACTION­d
DEVPATH=/class/usb_endpoint/usbdev4.6_ep81
SUBSYSTEM=usb_endpoint
SEQNUM\x1218
MAJOR%3
MINOR%
UDEVD_EVENT=1
DEVNAME=/dev/usbdev4.6_ep81

UDEV  [1178825388.253372] add@/class/usb_endpoint/usbdev4.6_ep02
UDEV_LOG=3
ACTION­d
DEVPATH=/class/usb_endpoint/usbdev4.6_ep02
SUBSYSTEM=usb_endpoint
SEQNUM\x1219
MAJOR%3
MINOR&
UDEVD_EVENT=1
DEVNAME=/dev/usbdev4.6_ep02

--
Greg Huber
Principal Engineer
Vanteon Corporation
255 Woodcliff Drive, Suite 200
Fairport, NY 14450
Office: (585) 419-9564
Fax: (585) 248-0537
www.vanteon.com <http://www.vanteon.com>  - Embedded for Your Future


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