diff options
Diffstat (limited to 'drivers/usb/gadget/udc/udc-core.c')
| -rw-r--r-- | drivers/usb/gadget/udc/udc-core.c | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/drivers/usb/gadget/udc/udc-core.c b/drivers/usb/gadget/udc/udc-core.c index 7d69931cf45d..2d28a8152201 100644 --- a/drivers/usb/gadget/udc/udc-core.c +++ b/drivers/usb/gadget/udc/udc-core.c @@ -457,21 +457,35 @@ EXPORT_SYMBOL_GPL(usb_udc_attach_driver); int usb_gadget_probe_driver(struct usb_gadget_driver *driver) { struct usb_udc *udc = NULL; - int ret; + int ret = -ENODEV; if (!driver || !driver->bind || !driver->setup) return -EINVAL; mutex_lock(&udc_lock); - list_for_each_entry(udc, &udc_list, list) { - /* For now we take the first one */ - if (!udc->driver) + if (driver->udc_name) { + list_for_each_entry(udc, &udc_list, list) { + ret = strcmp(driver->udc_name, dev_name(&udc->dev)); + if (!ret) + break; + } + if (ret) + ret = -ENODEV; + else if (udc->driver) + ret = -EBUSY; + else goto found; + } else { + list_for_each_entry(udc, &udc_list, list) { + /* For now we take the first one */ + if (!udc->driver) + goto found; + } } pr_debug("couldn't find an available UDC\n"); mutex_unlock(&udc_lock); - return -ENODEV; + return ret; found: ret = udc_bind_to_driver(udc, driver); mutex_unlock(&udc_lock); |