This is one of those "doesn't reproduce for me" sort of things,
so I can't really help with that.
You said this modem is a "USB 2.0" device ... fine, but is it also a
high speed device? Your kernel messages have been edited to remove
important details like that ... that's a bad habit when you're asking
for any kind of help.
If it's a high speed device, then this looks to be the same thing
that a few other people have reported. But agin, since it doesn't
reproduce for me, at this point there's nothing I can do to help.
I strongly suspect the attached patch will _not_ help you at all,
but give it a try anyway.
- Dave
Tweak some early enumeration code paths:
- After a set_address() error, reset the port. Failures in that particular
protocol request leave the device's address indeterminate.
- Let devices settle longer after successful SET_ADDRESS
EXPERIMENTAL ...
Index: g26/drivers/usb/core/hub.c
===================================================================
--- g26.orig/drivers/usb/core/hub.c 2006-05-30 21:00:25.000000000 -0700
+++ g26/drivers/usb/core/hub.c 2006-06-02 18:11:33.000000000 -0700
@@ -2165,6 +2165,8 @@ static int hub_set_address(struct usb_de
if (retval == 0) {
usb_set_device_state(udev, USB_STATE_ADDRESS);
ep0_reinit(udev);
+ /* allow HCD and peripheral time to settle */
+ msleep(40);
}
return retval;
}
@@ -2338,24 +2340,27 @@ hub_port_init (struct usb_hub *hub, stru
#undef GET_DESCRIPTOR_BUFSIZE
}
+ /* after set_address faults it's not clear what the device's
+ * address will be. reset and be sure.
+ *
+ * REVISIT peripherals could trigger erroneous faults...
+ */
for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
retval = hub_set_address(udev);
if (retval >= 0)
break;
- msleep(200);
+ (void) hub_port_reset(hub, port1, udev, delay);
}
if (retval < 0) {
dev_err(&udev->dev,
"device not accepting address %d, error %d\n",
udev->devnum, retval);
- goto fail;
+ continue;
}
-
+
/* cope with hardware quirkiness:
- * - let SET_ADDRESS settle, some device hardware wants it
* - read ep0 maxpacket even for high and low speed,
- */
- msleep(10);
+ */
if (USE_NEW_SCHEME(retry_counter))
break;
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