The user-space driver is attempting to read from the device, and apparently failing on its first attempt with an -EPIPE. The previous run of "modem_run" seems to succeed though.
Nothing you sent suggests EPIPE ...
I see several patches to endpoint handling etc. in USB over the relevant period, perhaps related ?
Shouldn't be; they'd affect mostly disconnect cleanup.
Relevant messages (with USB_DEBUG tuirned on) :
... Aug 19 02:04:14 lambent kernel: uhci-hcd 0000:00:1f.2: UHCI Host Controller ... Aug 19 02:04:15 lambent kernel: hub 1-0:0: new USB device on port 2, assigned address 2 Aug 19 02:04:15 lambent kernel: usb 1-2: Product: Speed Touch USB Aug 19 02:04:15 lambent kernel: usb 1-2: Manufacturer: ALCATEL Aug 19 02:04:15 lambent kernel: usb 1-2: SerialNumber: 0090D044FDCE Aug 19 02:04:39 lambent kernel: usb 1-2: control timeout on ep0in Aug 19 02:04:46 lambent last message repeated 2 times Aug 19 02:05:03 lambent pppd[553]: pppd 2.4.1 started by root, uid 0
I don't remember seeing the "control timeout" before.
That would previously have been "control/bulk timeout", giving no information about which device or endpoint was involved. (So not very helpful for anyone with multiple devices...) Did you get that older message before? Your user mode driver would have gotten some kind of -ETIMEDOUT (not -EPIPE!!) error.
If that change (see the top of drivers/usb/host/message.c) made any difference, I'm puzzled. On the other hand, the older code was pretty bizarre, and maybe it was covering up some bugs. Can you try this with an OHCI controller? Or EHCI, through a high speed hub (and transaction translator)? This change was just merged since last Friday.
There are also three or four UHCI patches fixing bugs folk have run into. You might want to get those and see if they help; I'm not sure about their status, other than "not yet merged".
- Dave
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