On Tue, 9 Jun 2009, Matthew Garrett wrote: > On Mon, Jun 08, 2009 at 07:47:06PM -0400, Alan Stern wrote: > > > It should not make any difference. Can you provide dmesg output with > > CONFIG_USB_DEBUG enabled, together with a usbmon trace? You might also > > want to #define VERBOSE_DEBUG at the start of drivers.c (before the > > #include lines). > > With autosuspend enabled I get the following: > > usb usb1: usb auto-resume > ehci_hcd 0000:00:1a.7: resume root hub > usb usb1: usb_resume_device: status 0 > hub 1-0:1.0: hub_resume > hub 1-0:1.0: port 2: status 0507 change 0000 > hub 1-0:1.0: port 5: status 0507 change 0000 > hub 1-0:1.0: usb_resume_interface: status 0 > usb usb1: usb_resume_both: status 0 > usb usb1: usb_autoresume_device: status 0 cnt 1 > usb 1-2: usb auto-resume > hub 1-0:1.0: state 7 ports 6 chg 0000 evt 0000 > hub 1-0:1.0: usb_autopm_get_interface: status 0 cnt 2 > usb usb1: usb_suspend_both: status -16 > hub 1-0:1.0: usb_autopm_set_interface: status -16 cnt 0 > ehci_hcd 0000:00:1a.7: GetStatus port 2 status 001005 POWER sig=se0 PE CONNECT > usb 1-2: finish resume > usb 1-2: usb_resume_device: status 0 > usb 1-2:1.0: usb_resume_interface: status 0 > usb 1-2:1.1: usb_resume_interface: status 0 > qcserial 1-2:1.2: usb_resume_interface: status 0 > usb 1-2:1.3: usb_resume_interface: status 0 > usb 1-2: usb_resume_both: status 0 > qcserial 1-2:1.2: usb_autopm_get_interface: status 0 cnt 1 > qcserial ttyUSB0: usb_serial_generic_open - failed resubmitting read urb, error -22 This -EINVAL is the key; everything before it is normal. I don't know why it happened; there's no obvious reason for it. Maybe you can track down the reason. Or I can try some testing of my own. > If I then do > > echo on >/sys/bus/usb/devices/1-2/power/level > > I get ... > and the device can be opened correctly. As far as I can tell these are > substantively identical, which leaves me confused. Me too. > Could it just be a > timing thing? The following patch makes it work, but seems suboptimal, > especially given the empty reset_resume... I just don't know. More testing is needed... Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
