On Fri, 2012-04-13 at 11:29 -0400, Steven Rostedt wrote: > > > > Second, if you do > > > > echo 0 >/sys/bus/usb/devices/usb1/bConfigurationValue > > This never returned. I did the echo, and the command locked up. > > (process 3077) > > cat /proc/3077/wchan > usb_disconnect > A sysrq-t gives this: [ 4468.680789] bash D ffff88022837d7d0 0 3077 3071 0x00000004 [ 4468.680792] ffff88022c0f7af8 0000000000000086 0000000000000001 ffff88022837d4c0 [ 4468.680796] ffff88022c0f7fd8 000000000000000a ffff88022c0f7fd8 ffff88022c0f7fd8 [ 4468.680800] ffff88022837f810 ffff88022837d4c0 ffff88022837d4c0 ffff88022c0f7fd8 [ 4468.680804] Call Trace: [ 4468.680807] [<ffffffff813f5a3f>] schedule+0x3f/0x60 [ 4468.680810] [<ffffffff813f6974>] __mutex_lock_slowpath+0x104/0x1a0 [ 4468.680813] [<ffffffff813f64a2>] mutex_lock+0x22/0x40 [ 4468.680821] [<ffffffffa00111a6>] usb_disconnect+0x96/0x140 [usbcore] [ 4468.680830] [<ffffffffa001118c>] usb_disconnect+0x7c/0x140 [usbcore] [ 4468.680837] [<ffffffffa00112b0>] hub_quiesce+0x60/0xc0 [usbcore] [ 4468.680844] [<ffffffffa001147c>] hub_disconnect+0x7c/0x100 [usbcore] [ 4468.680853] [<ffffffffa001b092>] usb_unbind_interface+0x52/0x180 [usbcore] [ 4468.680861] [<ffffffff812b650c>] __device_release_driver+0x7c/0xe0 [ 4468.680864] [<ffffffff812b659c>] device_release_driver+0x2c/0x40 [ 4468.680867] [<ffffffff812b6048>] bus_remove_device+0x78/0xb0 [ 4468.680870] [<ffffffff812b338d>] device_del+0x12d/0x1b0 [ 4468.680878] [<ffffffffa0018def>] usb_disable_device+0xaf/0x1d0 [usbcore] [ 4468.680886] [<ffffffffa0019778>] usb_set_configuration+0x278/0x6d0 [usbcore] [ 4468.680890] [<ffffffff8120f448>] ? sscanf+0x38/0x40 [ 4468.680898] [<ffffffffa001e5ca>] set_bConfigurationValue+0x6a/0x90 [usbcore] [ 4468.680901] [<ffffffff812b24b8>] dev_attr_store+0x18/0x30 [ 4468.680905] [<ffffffff811a81d2>] sysfs_write_file+0xe2/0x170 [ 4468.680909] [<ffffffff81139673>] vfs_write+0xb3/0x180 [ 4468.680913] [<ffffffff8113999a>] sys_write+0x4a/0x90 [ 4468.680916] [<ffffffff813fe7ab>] system_call_fastpath+0x16/0x1b -- Steve _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/linux-pm
