Re: Re: Reliable unreliability with D-Link DWL-122 USB

Karl,

Thanks again for your helpful and detailed comments. Latest finding
below...

--- [email protected] wrote:
<heavy snippage>
> - enabling hotplug debug messages
> - Turn off usb.rc coldplug simply by disabling the
> execute permissions on the file

Removing execute permissions on /etc/hotplug/usb.rc did not change the
behaviour, I still got the usual hang. hal is still disabled, too.

I have enabled hotplug debug messages. I'm not familiar with USB
initialisation so I can only make limited sense of what's happening. I
will post a heavily abridged excerpt from the log if anyone wants to
see the gory detail. Here's a summary of what happens.

usbcore registers drivers hub and prism2_usb
ehci_hcd registers bus no. 1 (USB 2.0) (6 ports)
uhci_hcd registers bus nos. 2,3,4 (2 ports each)
  [ I have 6 USB ports. The DWL-122 is the only device attached. ]
usb 2-1: new full speed USB device using uhci_hcd and address 2
write to prism2 card firmware
linkstatus=CONNECTED

default.hotplug: invoke /etc/hotplug/net.agent (1st time)
default.hotplug: add module p80211
wlan.agent: WLAN startup
default.hotplug: add module & driver prism2_usb
wlan.agent: WLAN p80211 starting
wland: daemon init, netlink socket opened and bound successfully

default.hotplug: add module & driver ehci_hcd
default.hotplug: add usb_host usb1,2,3,4;
default.hotplug: add various usb entries under /devices
default.hotplug: invoke /etc/hotplug/usb.agent (1st time)
default.hotplug: add module & driver uhci_hcd
default.hotplug: invoke /etc/hotplug/usb.agent (2nd time)

wlan.agent: WLAN register on wlan0 (prism2_usb) ; wlan0 registered.
default.hotplug: add usb entry /devices/pci0000.../usb2/2-1
default.hotplug: invoke /etc/hotplug/usb.agent (3rd time)
default.hotplug: add usb entry /proc/bus/usb/002/002
default.hotplug: invoke /etc/hotplug/usb.agent (4th time)
default.hotplug: add net entry /class/net/wlan0
default.hotplug: invoke /etc/hotplug/net.agent (2nd time)

usb.agent: Setup 0x00 0x00 for USB product 0/0/206 (4 times)
usb.agent: Setup prism2_usb for USB product 2001/3700/132
default.hotplug: add usb entry /devices/pci0000.../usb2
default.hotplug: invoke /etc/hotplug/usb.agent (5th time)
usb.agent: Setup 0x00 0x00 for USB product 2001/3700/132
wlan.agent: WLAN wlan0 brought up successfully; layer 3+ up

[At this point I log in, load a couple of web pages -> hang]

kernel: NETDEV WATCHDOG: wlan0: transmit timed out
kernel: usb_unlink_urb() is deprecated; Badness; wlan0 rx pipe reset.

The usb.agent script on my Fedora Core 3 system does not appear to look
at anything under /proc, but does read files under /sys/$DEVPATH where
$DEVPATH can be among the following:

DEVPATH=/bus/usb/drivers/prism2_usb
DEVPATH=/class/net/wlan0
DEVPATH=/class/usb_host/usb1 to usb4
DEVPATH=/module/prism2_usb
DEVPATH=/devices/pci0000:00/0000:00:10.0/usb2
DEVPATH=/devices/pci0000:00/0000:00:10.0/usb2/2-0:1.0 etc.

Following Karl's suggestion in another post, I tried putting a long
sleep in /etc/hotplug/wlan.agent, and so far this seems to work -
thanks!

Cheers,

Dave


	
	
		
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