On Fri, 2 Jun 2006, Rainer Becker wrote: > I have difficulties with an USB repeater cable. It uses an USB hub as > repeater. > Here are the error messages: > > Jun 2 17:12:26 kwasir kernel: hub 5-2.4:1.0: Cannot enable port 1. Maybe the > USB cable is bad? > Jun 2 17:12:27 kwasir kernel: hub 5-2.4:1.0: Cannot enable port 1. Maybe the > USB cable is bad? > Jun 2 17:12:28 kwasir kernel: hub 5-2.4:1.0: Cannot enable port 1. Maybe the > USB cable is bad? > Jun 2 17:12:29 kwasir kernel: hub 5-2.4:1.0: Cannot enable port 1. Maybe the > USB cable is bad? > Jun 2 17:12:31 kwasir kernel: hub 5-2.4:1.0: Cannot enable port 2. Maybe the > USB cable is bad? > Jun 2 17:12:32 kwasir kernel: hub 5-2.4:1.0: Cannot enable port 2. Maybe the > USB cable is bad? > Jun 2 17:12:33 kwasir kernel: hub 5-2.4:1.0: Cannot enable port 2. Maybe the > USB cable is bad? > Jun 2 17:12:33 kwasir kernel: hub 5-2.4:1.0: Cannot enable port 2. Maybe the > USB cable is bad? > Jun 2 17:12:35 kwasir kernel: hub 5-2.4:1.0: Cannot enable port 3. Maybe the > USB cable is bad? > Jun 2 17:12:36 kwasir kernel: hub 5-2.4:1.0: Cannot enable port 3. Maybe the > USB cable is bad? > Jun 2 17:12:37 kwasir kernel: hub 5-2.4:1.0: Cannot enable port 3. Maybe the > USB cable is bad? > Jun 2 17:12:38 kwasir kernel: hub 5-2.4:1.0: Cannot enable port 3. Maybe the > USB cable is bad? > Jun 2 17:12:39 kwasir kernel: hub 5-2:1.0: Cannot enable port 1. Maybe the > USB > cable is bad? > Jun 2 17:12:40 kwasir kernel: hub 5-2:1.0: Cannot enable port 1. Maybe the > USB > cable is bad? > Jun 2 17:12:41 kwasir kernel: hub 5-2:1.0: Cannot enable port 1. Maybe the > USB > cable is bad? > Jun 2 17:12:42 kwasir kernel: hub 5-2:1.0: Cannot enable port 1. Maybe the > USB > cable is bad? > Jun 2 17:12:43 kwasir kernel: hub 5-2:1.0: Cannot enable port 2. Maybe the > USB > cable is bad? > Jun 2 17:12:44 kwasir kernel: hub 5-2:1.0: Cannot enable port 2. Maybe the > USB > cable is bad? > Jun 2 17:12:45 kwasir kernel: hub 5-2:1.0: Cannot enable port 2. Maybe the > USB > cable is bad? > Jun 2 17:12:46 kwasir kernel: hub 5-2:1.0: Cannot enable port 2. Maybe the > USB > cable is bad? > Jun 2 17:12:47 kwasir kernel: hub 5-2:1.0: Cannot enable port 3. Maybe the > USB > cable is bad? > Jun 2 17:12:48 kwasir kernel: hub 5-2:1.0: Cannot enable port 3. Maybe the > USB > cable is bad? > Jun 2 17:12:49 kwasir kernel: hub 5-2:1.0: Cannot enable port 3. Maybe the > USB > cable is bad? > Jun 2 17:12:50 kwasir kernel: hub 5-2:1.0: Cannot enable port 3. Maybe the > USB > cable is bad? > .... > > Every second an error and lsusb needs a long time. > > This is the output of "lsusb" > > [EMAIL PROTECTED](97): lsusb > Bus 005 Device 065: ID 046a:0027 Cherry GmbH > Bus 005 Device 066: ID 0d8c:000c C-Media Electronics, Inc. Audio Adapter > Bus 005 Device 040: ID 04b4:6560 Cypress Semiconductor Corp. CY7C65640 USB-2.0 > "TetraHub" > Bus 005 Device 015: ID 05e3:0606 Genesys Logic, Inc. > Bus 005 Device 002: ID 05e3:0606 Genesys Logic, Inc. > Bus 005 Device 001: ID 0000:0000 > Bus 004 Device 001: ID 0000:0000 > Bus 003 Device 001: ID 0000:0000 > Bus 002 Device 001: ID 0000:0000 > Bus 001 Device 001: ID 0000:0000 > > The Genesys Logic devices are the repeater hubs. > > The following patch solves the problem: > > --- drivers/usb/core/hub.c.orig 2006-05-26 19:40:46.000000000 +0200 > +++ drivers/usb/core/hub.c 2006-05-26 20:41:06.000000000 +0200 > @@ -1467,7 +1467,10 @@ > > /* bomb out completely if something weird happened */ > if ((portchange & USB_PORT_STAT_C_CONNECTION)) > + return -ENOTCONN; > +/* > return -EINVAL; > +*/ > > /* if we`ve finished resetting, then break out of the loop */ > if (!(portstatus & USB_PORT_STAT_RESET) &&
I'm getting a little confused. Is "the problem" that you have so many messages in the log and it takes a long time, or is "the problem" that the port cannot be enabled? This patch won't allow the port to be enabled. > But I don't know, whether this patch creates other difficulties. Has anybody > an > answer? It seems like a reasonable thing to do. In fact you might as well combine this test with the preceding test, since they will both return -ENOTCONN. Alan Stern _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
