X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fusb%2Fcore%2Fusb.c;h=3a16e07d01856c145669426d32e522d16ceee477;hb=836b7aab793962aeac45cedd049970ca058258d5;hp=3c2ddb5d021e2853fb5b527de39c4748f0cf2ae6;hpb=56985ab57d52a966a60f5e812e166d1b4c9c120a;p=linux-2.6.git diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index 3c2ddb5d0..3a16e07d0 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -883,6 +883,8 @@ struct usb_device *usb_find_device(u16 vendor_id, u16 product_id) buslist != &usb_bus_list; buslist = buslist->next) { bus = container_of(buslist, struct usb_bus, bus_list); + if (!bus->root_hub) + continue; dev = match_device(bus->root_hub, vendor_id, product_id); if (dev) goto exit; @@ -944,235 +946,6 @@ int __usb_get_extra_descriptor(char *buffer, unsigned size, return -1; } -/** - * usb_disconnect - disconnect a device (usbcore-internal) - * @pdev: pointer to device being disconnected - * Context: !in_interrupt () - * - * Something got disconnected. Get rid of it, and all of its children. - * - * Only hub drivers (including virtual root hub drivers for host - * controllers) should ever call this. - * - * This call is synchronous, and may not be used in an interrupt context. - */ -void usb_disconnect(struct usb_device **pdev) -{ - struct usb_device *dev = *pdev; - struct usb_bus *bus; - struct usb_operations *ops; - int i; - - might_sleep (); - - if (!dev) { - pr_debug ("%s nodev\n", __FUNCTION__); - return; - } - bus = dev->bus; - if (!bus) { - pr_debug ("%s nobus\n", __FUNCTION__); - return; - } - ops = bus->op; - - *pdev = NULL; - - /* mark the device as inactive, so any further urb submissions for - * this device will fail. - */ - dev->state = USB_STATE_NOTATTACHED; - down(&dev->serialize); - - dev_info (&dev->dev, "USB disconnect, address %d\n", dev->devnum); - - /* Free up all the children before we remove this device */ - for (i = 0; i < USB_MAXCHILDREN; i++) { - struct usb_device **child = dev->children + i; - if (*child) - usb_disconnect(child); - } - - /* deallocate hcd/hardware state ... nuking all pending urbs and - * cleaning up all state associated with the current configuration - */ - usb_disable_device(dev, 0); - - /* Free the device number and remove the /proc/bus/usb entry */ - dev_dbg (&dev->dev, "unregistering device\n"); - usb_release_address(dev); - usbfs_remove_device(dev); - up(&dev->serialize); - device_unregister(&dev->dev); -} - -/** - * usb_choose_address - pick device address (usbcore-internal) - * @dev: newly detected device (in DEFAULT state) - * - * Picks a device address. It's up to the hub (or root hub) driver - * to handle and manage enumeration, starting from the DEFAULT state. - * Only hub drivers (but not virtual root hub drivers for host - * controllers) should ever call this. - */ -void usb_choose_address(struct usb_device *dev) -{ - int devnum; - // FIXME needs locking for SMP!! - /* why? this is called only from the hub thread, - * which hopefully doesn't run on multiple CPU's simultaneously 8-) - */ - - /* Try to allocate the next devnum beginning at bus->devnum_next. */ - devnum = find_next_zero_bit(dev->bus->devmap.devicemap, 128, dev->bus->devnum_next); - if (devnum >= 128) - devnum = find_next_zero_bit(dev->bus->devmap.devicemap, 128, 1); - - dev->bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1); - - if (devnum < 128) { - set_bit(devnum, dev->bus->devmap.devicemap); - dev->devnum = devnum; - } -} - -/** - * usb_release_address - deallocate device address (usbcore-internal) - * @dev: newly removed device - * - * Removes and deallocates the address assigned to a device. - * Only hub drivers (but not virtual root hub drivers for host - * controllers) should ever call this. - */ -void usb_release_address(struct usb_device *dev) -{ - if (dev->devnum > 0) { - clear_bit(dev->devnum, dev->bus->devmap.devicemap); - dev->devnum = -1; - } -} - - -static inline void usb_show_string(struct usb_device *dev, char *id, int index) -{ - char *buf; - - if (!index) - return; - if (!(buf = kmalloc(256, GFP_KERNEL))) - return; - if (usb_string(dev, index, buf, 256) > 0) - dev_printk(KERN_INFO, &dev->dev, "%s: %s\n", id, buf); - kfree(buf); -} - -static int usb_choose_configuration(struct usb_device *dev) -{ - int c, i; - - c = dev->config[0].desc.bConfigurationValue; - if (dev->descriptor.bNumConfigurations != 1) { - for (i = 0; i < dev->descriptor.bNumConfigurations; i++) { - struct usb_interface_descriptor *desc; - - /* heuristic: Linux is more likely to have class - * drivers, so avoid vendor-specific interfaces. - */ - desc = &dev->config[i].intf_cache[0] - ->altsetting->desc; - if (desc->bInterfaceClass == USB_CLASS_VENDOR_SPEC) - continue; - /* COMM/2/all is CDC ACM, except 0xff is MSFT RNDIS */ - if (desc->bInterfaceClass == USB_CLASS_COMM - && desc->bInterfaceSubClass == 2 - && desc->bInterfaceProtocol == 0xff) - continue; - c = dev->config[i].desc.bConfigurationValue; - break; - } - dev_info(&dev->dev, - "configuration #%d chosen from %d choices\n", - c, dev->descriptor.bNumConfigurations); - } - return c; -} - -/* - * usb_new_device - perform initial device setup (usbcore-internal) - * @dev: newly addressed device (in ADDRESS state) - * - * This is called with devices which have been enumerated, but not yet - * configured. The device descriptor is available, but not descriptors - * for any device configuration. The caller owns dev->serialize, and - * the device is not visible through sysfs or other filesystem code. - * - * Returns 0 for success (device is configured and listed, with its - * interfaces, in sysfs); else a negative errno value. On error, one - * reference count to the device has been dropped. - * - * This call is synchronous, and may not be used in an interrupt context. - * - * Only the hub driver should ever call this; root hub registration - * uses it only indirectly. - */ -int usb_new_device(struct usb_device *dev) -{ - int err; - int c; - - err = usb_get_configuration(dev); - if (err < 0) { - dev_err(&dev->dev, "can't read configurations, error %d\n", - err); - goto fail; - } - - /* Tell the world! */ - dev_dbg(&dev->dev, "new device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", - dev->descriptor.iManufacturer, dev->descriptor.iProduct, dev->descriptor.iSerialNumber); - -#ifdef DEBUG - if (dev->descriptor.iProduct) - usb_show_string(dev, "Product", dev->descriptor.iProduct); - if (dev->descriptor.iManufacturer) - usb_show_string(dev, "Manufacturer", dev->descriptor.iManufacturer); - if (dev->descriptor.iSerialNumber) - usb_show_string(dev, "SerialNumber", dev->descriptor.iSerialNumber); -#endif - - /* put device-specific files into sysfs */ - err = device_add (&dev->dev); - if (err) { - dev_err(&dev->dev, "can't device_add, error %d\n", err); - goto fail; - } - usb_create_sysfs_dev_files (dev); - - /* choose and set the configuration. that registers the interfaces - * with the driver core, and lets usb device drivers bind to them. - * NOTE: should interact with hub power budgeting. - */ - c = usb_choose_configuration(dev); - err = usb_set_configuration(dev, c); - if (err) { - dev_err(&dev->dev, "can't set config #%d, error %d\n", c, err); - device_del(&dev->dev); - goto fail; - } - - /* USB device state == configured ... usable */ - - /* add a /proc/bus/usb entry */ - usbfs_add_device(dev); - - return 0; -fail: - dev->state = USB_STATE_NOTATTACHED; - usb_release_address(dev); - usb_put_dev(dev); - return err; -} - /** * usb_buffer_alloc - allocate dma-consistent buffer for URB_NO_xxx_DMA_MAP * @dev: device the buffer will be used with