linux-kernel - [regression] 2.6.39-rc1 - Beagleboard usbnet broken

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Date:	Mon, 04 Apr 2011 10:22:17 +0100
From:	Mark Jackson <mpfj-list@...c.co.uk>
To:	linux-omap@...r.kernel.org
CC:	lkml <linux-kernel@...r.kernel.org>
Subject: [regression] 2.6.39-rc1 - Beagleboard usbnet broken

Running 2.6.38 on my beagleboard, I can boot using nfs:-

regulator_init_complete: VDVI: incomplete constraints, leaving on
regulator_init_complete: VDAC: incomplete constraints, leaving on
usb 1-2: new high speed USB device using ehci-omap and address 2
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new high speed SDHC card at address 1234
usb 1-2: New USB device found, idVendor=0424, idProduct=9514
usb 1-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
mmcblk0: mmc0:1234 SA04G 3.67 GiB
hub 1-2:1.0: USB hub found
 mmcblk0: p1
hub 1-2:1.0: 5 ports detected
usb 1-2.1: new high speed USB device using ehci-omap and address 3
usb 1-2.1: New USB device found, idVendor=0424, idProduct=ec00
usb 1-2.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
smsc95xx v1.0.4
smsc95xx 1-2.1:1.0: usb0: register 'smsc95xx' at usb-ehci-omap.0-2.1, smsc95xx USB 2.0 Ethernet,
9e:79:dd:1e:2e:5c
Sending DHCP requests .
usb0: link up, 100Mbps, full-duplex, lpa 0x45E1
., OK
IP-Config: Got DHCP answer from 10.0.0.1, my address is 10.0.0.113
IP-Config: Complete:
     device=usb0, addr=10.0.0.113, mask=255.255.0.0, gw=10.0.0.1,
     host=10.0.0.113, domain=, nis-domain=(none),
     bootserver=10.0.0.1, rootserver=10.0.0.100, rootpath=
VFS: Mounted root (nfs filesystem) on device 0:10.
.... etc ....

I have just tried out 2.6.39-rc1, and the usbnet is no longer detected:-

regulator_init_complete: VDVI: incomplete constraints, leaving on
regulator_init_complete: VDAC: incomplete constraints, leaving on
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new high speed SDHC card at address 1234
mmcblk0: mmc0:1234 SA04G 3.67 GiB
 mmcblk0: p1
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "nfs" or unknown-block(2,0)
Please append a correct "root=" boot option; here are the available partitions:
b300         3858432 mmcblk0  driver: mmcblk
  b301           72261 mmcblk0p1 00000000-0000-0000-0000-000000000mmcblk0p1
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

I have tried a git bisect, but it seems to blame the wrong thing:-

087809fce28f50098d9c3ef1a6865c722f23afd2 is the first bad commit
commit 087809fce28f50098d9c3ef1a6865c722f23afd2
Author: Jamie Iles <jamie@...ieiles.com>
Date:   Fri Jan 21 14:11:52 2011 +0000

    dmaengine/dw_dmac: don't scan descriptors if no xfers in progress

    Some hardware (picoChip picoXCell in particular) sometimes has
    the block transfer complete bit being set for a channel after the
    whole transfer has completed. If we don't have any transfers in the
    active list then don't bother to scan the descriptors. This often
    happens in normal operation and doesn't require the channel to be
    reset.

    v2: cleanup whitespace

    Signed-off-by: Jamie Iles <jamie.iles@...ochip.com>
    Signed-off-by: Dan Williams <dan.j.williams@...el.com>

:040000 040000 d0dac7f65b52fb1849f77056740d84d06530629f 211910a820dad07f0439410cc849c34909a62c2f M
drivers

I have attached my .config.  Can anyone help ?

Cheers
Mark

View attachment ".config" of type "text/plain" (37328 bytes)