[Bug 396417] Re: Edimax Wireless USB Dongle Failure Karmic Kernel 2.6.31-X

[Andy Whitcroft]

@Andy Rogers -- thanks for your very comprehensive replies.

>From the 2.6.30 dmesg output we see that the kernel attempts to use both
the rt25000 driver and the rt73 driver, but the former fails to bind:

    [   18.626748] phy0 -> rt2500usb_init_eeprom: Error - Invalid RT chipset detected.
    [   18.626760] phy0 -> rt2x00lib_probe_dev: Error - Failed to allocate device.
    [   18.626839] usbcore: registered new interface driver rt2500usb
    [   18.835405] Intel ICH 0000:00:02.7: PCI INT C -> GSI 18 (level, low) -> IRQ 18
    [   18.992141] phy1: Selected rate control algorithm 'minstrel'
    [   18.993466] Registered led device: rt73usb-phy1::radio
    [   18.993512] Registered led device: rt73usb-phy1::assoc
    [   18.993548] Registered led device: rt73usb-phy1::quality
    [   18.994395] usbcore: registered new interface driver rt73usb

Whereas with 2.6.31-rc3 we see the rt2500 driver bind and fail:

    [   16.496142] phy0: Selected rate control algorithm 'minstrel'
    [   16.496940] Registered led device: rt2500usb-phy0::radio
    [   16.496978] Registered led device: rt2500usb-phy0::quality
    [...]
    [   16.504190] usbcore: registered new interface driver rt2500usb
    [   16.554735] usbcore: registered new interface driver rt73usb
    [...]
    [   27.632025] phy0 -> rt2500usb_set_device_state: Error - Device failed to enter state 3 (-16).
    [   27.632033] phy0 -> rt2500usb_set_device_state: Error - Device failed to enter state 4 (-5).

This specific code chipset matching code has been fixed recently to
simplify it in these two commits:

    commit 358623c22c9fd837b3b1b444377037f72553dc9f
    Author: Ivo van Doorn <ivdoorn at gmail.com>
    Date:   Tue May 5 19:46:08 2009 +0200

        rt2x00: Simplify rt2x00_check_rev

    commit 5a9940118a616266183c53a9ee4352feadb9c2e8
    Author: Ivo van Doorn <ivdoorn at gmail.com>
    Date:   Fri May 8 18:30:43 2009 +0200

        rt2x00: Fix chipset detection for rt73usb

These two in combination switch over to a mask based chipset version
matcher.  However also remove the code from rt2x00_check_rev() which
checked the bottom four bits as non-zero passing that responsibility to
the caller.  This appears to change the semantics of the rt2500usb
matcher.

Will spin a test patch to undo this semantic change and post test
kernels shortly.

-- 
Edimax Wireless USB Dongle Failure Karmic Kernel 2.6.31-X
https://bugs.launchpad.net/bugs/396417
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