Re: USB Mass Storage devices continually reenumerate

Alan Stern wrote:
> About all you can do is what I suggested earlier: Plug the device into
> a powered hub, which most likely will provide enough current for the
> device's needs.  If the device then works, you will know that the host
> doesn't provide enough current.  If it doesn't, that's a reasonably 
> good indication that the current draw isn't the source of the problem.

OK. I'm using a Dynex hub which claims to be self-powered. Now the hub
itself sometimes gets disconnected when I plug in a flash drive:

18:24:52 usb 1-2.1: new full speed USB device using ohci_hcd and address 82
18:24:52 usb 1-2.1: Product: U3 Cruzer Micro
18:24:52 usb 1-2.1: Manufacturer: SanDisk Corporation
18:24:53 usb 1-2.1: SerialNumber: 0000184AA4731482
18:24:53 usb 1-2.1: configuration #1 chosen from 1 choice
18:24:53 scsi78 : SCSI emulation for USB Mass Storage devices
18:24:58 scsi 78:0:0:0: Direct-Access     SanDisk  U3 Cruzer Micro  4.04
PQ: 0 ANSI: 2
18:24:58 7>usb-storage: Status code 0; transferred 31/31
18:24:58 sd 78:0:0:0: [sda] 3999377 512-byte hardware sectors (2048 MB)
18:24:59 sd 78:0:0:0: [sda] Write Protect is off
18:25:01 sd 78:0:0:0: [sda] 3999377 512-byte hardware sectors (2048 MB)
18:25:01 sd 78:0:0:0: [sda] Write Protect is off
18:25:01  sda:<7>usb-storage: queuecommand called
18:25:01 usb 1-2: USB disconnect, address 81
18:25:01 usb 1-2.1: USB disconnect, address 82
18:25:02 sd 78:0:0:0: [sda] Result: hostbyte=0x07 driverbyte=0x00
18:25:02 sd 78:0:0:0: [sda] Result: hostbyte=0x01 driverbyte=0x00
18:25:02 sd 78:0:0:0: [sda] Attached SCSI removable disk
18:25:02 usb 1-2: new full speed USB device using ohci_hcd and address 83
18:25:02 usb 1-2: configuration #1 chosen from 1 choice
18:25:02 hub 1-2:1.0: USB hub found
18:25:02 hub 1-2:1.0: 4 ports detected
18:25:03 usb 1-2.1: new full speed USB device using ohci_hcd and address 84
18:25:10 usb 1-2.1: new full speed USB device using ohci_hcd and address 85
18:25:12 usb 1-2: USB disconnect, address 83

In the debug log, I see that it's unable to reenable the port on the hub:

18:25:03 hub 1-2:1.0: enabling power on all ports
18:25:03 drivers/usb/core/inode.c: creating file '083'
18:25:03 hub 1-0:1.0: state 7 ports 2 chg 0000 evt 0004
18:25:03 hub 1-2:1.0: state 7 ports 4 chg 0000 evt 0000
18:25:03 hub 1-2:1.0: port 1, status 0101, change 0001, 12 Mb/s
18:25:03 hub 1-2:1.0: debounce: port 1: total 100ms stable 100ms status
0x101
18:25:03 hub 1-2:1.0: port 1 not reset yet, waiting 10ms
18:25:04 usb 1-2.1: khubd timed out on ep0in len=0/64
18:25:04 ohci_hcd 0000:00:13.0: urb c11bb260 path 2.1 ep0in 5ec20000 cc
5 --> status -62
18:25:04 ohci_hcd 0000:00:13.0: urb c11bb260 path 2.1 ep0in 5ec20000 cc
5 --> status -62
18:25:04 hub 1-2:1.0: port 1 not reset yet, waiting 10ms
18:25:09 usb 1-2.1: khubd timed out on ep0in len=0/64
18:25:09 ohci_hcd 0000:00:13.0: urb c11bb260 path 2.1 ep0in 5ec20000 cc
5 --> status -62
18:25:09 ohci_hcd 0000:00:13.0: urb c11bb260 path 2.1 ep0in 5ec20000 cc
5 --> status -62
18:25:09 hub 1-2:1.0: port 1 not reset yet, waiting 10ms
18:25:09 hub 1-2:1.0: port 1 not reset yet, waiting 10ms
18:25:12 ohci_hcd 0000:00:13.0: urb c11bb260 path 2.1 ep0in 5fd60000 cc
5 --> status -62
18:25:12 ohci_hcd 0000:00:13.0: urb c11bb260 path 2.1 ep0in 5ec20000 cc
5 --> status -62
18:25:12 ohci_hcd 0000:00:13.0: urb c11bb260 path 2.1 ep0in 5ec20000 cc
5 --> status -62
18:25:12 ohci_hcd 0000:00:13.0: urb c11bb260 path 2 ep0out 5ec20000 cc 5
--> status -62
18:25:12 hub 1-2:1.0: port 1 not enabled, trying reset again...

Mike

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