On Tue, Dec 31, 2013 at 1:54 PM, Valentina Manea <valentina.manea.m@xxxxxxxxx> wrote: > Hi, > > I am working on the USB/IP drivers in the staging directory and bumped > into an issue with one of the drivers. > > usbip-host is declared as struct usb_driver (so, an USB interface > driver). My task was to transform it to struct usb_device_driver - in > this way, instead of binding each interface to the driver, the whole > device would be bound to the driver. > > The binding is made from userspace via the bind file of the driver [1] > and using libsysfs. With the old version of the driver, one would > write something like 1-1:1.0 to bind interface 0 of device with bus ID > 1-1. > > However, with the new version of the driver, using the same syntax for > device identification (1-1:1.0), this binding fails: > * libsysfs doesn't give much info about the error > * echo-ing the ID into bind file as shown in [1] doesn't work in > either case; on the other hand, I can succesfully unbind the device > from the default driver (usb-storage in this case) using the same > mechanism > * I have a printk in the probe function of the driver - it seems it > doesn't even get there. > > I am missing something but have no clue where to look anymore. > > Thanks, > Valentina > > [1] http://lwn.net/Articles/143397/ Just in case anyone ever bumps into the same problem, it seems there is a generic USB device driver (*device* driver, not *interface* device driver) that claims all the USB devices. So, one should first unbind from that driver; echo-ing the bus ID into /sys/bus/usb/drivers/usb/unbind will do. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
