diff options
Diffstat (limited to 'drivers/usb/core/devio.c')
| -rw-r--r-- | drivers/usb/core/devio.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index ebb8a9de8b5f..e0356cb859b5 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -1928,6 +1928,38 @@ static int proc_get_capabilities(struct dev_state *ps, void __user *arg) return 0; } +static int proc_disconnect_claim(struct dev_state *ps, void __user *arg) +{ + struct usbdevfs_disconnect_claim dc; + struct usb_interface *intf; + + if (copy_from_user(&dc, arg, sizeof(dc))) + return -EFAULT; + + intf = usb_ifnum_to_if(ps->dev, dc.interface); + if (!intf) + return -EINVAL; + + if (intf->dev.driver) { + struct usb_driver *driver = to_usb_driver(intf->dev.driver); + + if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) && + strncmp(dc.driver, intf->dev.driver->name, + sizeof(dc.driver)) != 0) + return -EBUSY; + + if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) && + strncmp(dc.driver, intf->dev.driver->name, + sizeof(dc.driver)) == 0) + return -EBUSY; + + dev_dbg(&intf->dev, "disconnect by usbfs\n"); + usb_driver_release_interface(driver, intf); + } + + return claimintf(ps, dc.interface); +} + /* * NOTE: All requests here that have interface numbers as parameters * are assuming that somehow the configuration has been prevented from @@ -2101,6 +2133,9 @@ static long usbdev_do_ioctl(struct file *file, unsigned int cmd, case USBDEVFS_GET_CAPABILITIES: ret = proc_get_capabilities(ps, p); break; + case USBDEVFS_DISCONNECT_CLAIM: + ret = proc_disconnect_claim(ps, p); + break; } usb_unlock_device(dev); if (ret >= 0) |