USB Mass Storage devices continually reenumerate

I'm seeing some flaky behavior with USB sticks on an OHCI system that
work fine elsewhere. The issues aren't consistent, but often when I plug
in a device it disconnects when the storage code tries to scan it, then
it reconnects, then it disconnects again, ad infinitum. For example:

usb 1-2: new full speed USB device using ohci_hcd and address 54
usb 1-2: Product: TRAVELDRIVE 005B
usb 1-2: Manufacturer: Memorex
usb 1-2: SerialNumber: 07770E2F0044
usb 1-2: configuration #1 chosen from 1 choice
scsi29 : SCSI emulation for USB Mass Storage devices
scsi 29:0:0:0: Direct-Access     Memorex  TRAVELDRIVE 005B PMAP PQ: 0
ANSI: 0 CCS
usb 1-2: USB disconnect, address 54
sd 29:0:0:0: [sda] READ CAPACITY failed
sd 29:0:0:0: [sda] Result: hostbyte=0x01 driverbyte=0x00
sd 29:0:0:0: [sda] Sense not available.
sd 29:0:0:0: [sda] Write Protect is off
sd 29:0:0:0: [sda] Attached SCSI removable disk
usb 1-2: new full speed USB device using ohci_hcd and address 55
usb 1-2: Product: TRAVELDRIVE 005B
usb 1-2: Manufacturer: Memorex
usb 1-2: SerialNumber: 07770E2F0044
usb 1-2: configuration #1 chosen from 1 choice
scsi30 : SCSI emulation for USB Mass Storage devices
scsi 30:0:0:0: Direct-Access     Memorex  TRAVELDRIVE 005B PMAP PQ: 0
ANSI: 0 CCS
C: 0x24, ASCQ: 0x0
sd 30:0:0:0: [sda] 2013184 512-byte hardware sectors (1031 MB)
usb 1-2: USB disconnect, address 55
sd 30:0:0:0: [sda] Write Protect is off
 sda:<7>usb-storage: queuecommand called
sd 30:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
sd 30:0:0:0: [sda] Result: hostbyte=0x01 driverbyte=0x00
sd 30:0:0:0: [sda] Attached SCSI removable disk
usb 1-2: new full speed USB device using ohci_hcd and address 56
usb 1-2: Product: TRAVELDRIVE 005B
usb 1-2: Manufacturer: Memorex
usb 1-2: SerialNumber: 07770E2F0044
usb 1-2: configuration #1 chosen from 1 choice
scsi31 : SCSI emulation for USB Mass Storage devices

and so on. I have the verbose mass storage output also, but it's a *lot*
of output. I could post it somewhere if it would be useful. I've also
(rarely) seen USB hubs "thrash" in the same way on this controller, but
nowhere near this reproducibly.

Any ideas? I do have some reason to suspect the host controller, but if
so then I need to track down what the actual issue is, and it's quite
reproducible with certain devices.

Thanks,
Mike

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