15fd54aceSGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0+ 296c27377SValentina Manea /* 396c27377SValentina Manea * Copyright (C) 2003-2008 Takahiro Hirofuchi 496c27377SValentina Manea */ 596c27377SValentina Manea 696c27377SValentina Manea #include <linux/device.h> 796c27377SValentina Manea #include <linux/file.h> 896c27377SValentina Manea #include <linux/kthread.h> 996c27377SValentina Manea #include <linux/module.h> 1096c27377SValentina Manea 1196c27377SValentina Manea #include "usbip_common.h" 1296c27377SValentina Manea #include "stub.h" 1396c27377SValentina Manea 1496c27377SValentina Manea /* 1596c27377SValentina Manea * usbip_status shows the status of usbip-host as long as this driver is bound 1696c27377SValentina Manea * to the target device. 1796c27377SValentina Manea */ 1896c27377SValentina Manea static ssize_t usbip_status_show(struct device *dev, 1996c27377SValentina Manea struct device_attribute *attr, char *buf) 2096c27377SValentina Manea { 2196c27377SValentina Manea struct stub_device *sdev = dev_get_drvdata(dev); 2296c27377SValentina Manea int status; 2396c27377SValentina Manea 2496c27377SValentina Manea if (!sdev) { 2596c27377SValentina Manea dev_err(dev, "sdev is null\n"); 2696c27377SValentina Manea return -ENODEV; 2796c27377SValentina Manea } 2896c27377SValentina Manea 2996c27377SValentina Manea spin_lock_irq(&sdev->ud.lock); 3096c27377SValentina Manea status = sdev->ud.status; 3196c27377SValentina Manea spin_unlock_irq(&sdev->ud.lock); 3296c27377SValentina Manea 3396c27377SValentina Manea return snprintf(buf, PAGE_SIZE, "%d\n", status); 3496c27377SValentina Manea } 3596c27377SValentina Manea static DEVICE_ATTR_RO(usbip_status); 3696c27377SValentina Manea 3796c27377SValentina Manea /* 3896c27377SValentina Manea * usbip_sockfd gets a socket descriptor of an established TCP connection that 3996c27377SValentina Manea * is used to transfer usbip requests by kernel threads. -1 is a magic number 4096c27377SValentina Manea * by which usbip connection is finished. 4196c27377SValentina Manea */ 42ca35910aSGreg Kroah-Hartman static ssize_t usbip_sockfd_store(struct device *dev, struct device_attribute *attr, 4396c27377SValentina Manea const char *buf, size_t count) 4496c27377SValentina Manea { 4596c27377SValentina Manea struct stub_device *sdev = dev_get_drvdata(dev); 4696c27377SValentina Manea int sockfd = 0; 4796c27377SValentina Manea struct socket *socket; 4896c27377SValentina Manea int rv; 4996c27377SValentina Manea 5096c27377SValentina Manea if (!sdev) { 5196c27377SValentina Manea dev_err(dev, "sdev is null\n"); 5296c27377SValentina Manea return -ENODEV; 5396c27377SValentina Manea } 5496c27377SValentina Manea 5596c27377SValentina Manea rv = sscanf(buf, "%d", &sockfd); 5696c27377SValentina Manea if (rv != 1) 5796c27377SValentina Manea return -EINVAL; 5896c27377SValentina Manea 5996c27377SValentina Manea if (sockfd != -1) { 6096c27377SValentina Manea int err; 6196c27377SValentina Manea 6296c27377SValentina Manea dev_info(dev, "stub up\n"); 6396c27377SValentina Manea 6496c27377SValentina Manea spin_lock_irq(&sdev->ud.lock); 6596c27377SValentina Manea 6696c27377SValentina Manea if (sdev->ud.status != SDEV_ST_AVAILABLE) { 6796c27377SValentina Manea dev_err(dev, "not ready\n"); 6896c27377SValentina Manea goto err; 6996c27377SValentina Manea } 7096c27377SValentina Manea 7196c27377SValentina Manea socket = sockfd_lookup(sockfd, &err); 7296c27377SValentina Manea if (!socket) 7396c27377SValentina Manea goto err; 7496c27377SValentina Manea 7596c27377SValentina Manea sdev->ud.tcp_socket = socket; 76009f41aeSShuah Khan sdev->ud.sockfd = sockfd; 7796c27377SValentina Manea 7896c27377SValentina Manea spin_unlock_irq(&sdev->ud.lock); 7996c27377SValentina Manea 8096c27377SValentina Manea sdev->ud.tcp_rx = kthread_get_run(stub_rx_loop, &sdev->ud, 8196c27377SValentina Manea "stub_rx"); 8296c27377SValentina Manea sdev->ud.tcp_tx = kthread_get_run(stub_tx_loop, &sdev->ud, 8396c27377SValentina Manea "stub_tx"); 8496c27377SValentina Manea 8596c27377SValentina Manea spin_lock_irq(&sdev->ud.lock); 8696c27377SValentina Manea sdev->ud.status = SDEV_ST_USED; 8796c27377SValentina Manea spin_unlock_irq(&sdev->ud.lock); 8896c27377SValentina Manea 8996c27377SValentina Manea } else { 9096c27377SValentina Manea dev_info(dev, "stub down\n"); 9196c27377SValentina Manea 9296c27377SValentina Manea spin_lock_irq(&sdev->ud.lock); 9396c27377SValentina Manea if (sdev->ud.status != SDEV_ST_USED) 9496c27377SValentina Manea goto err; 9596c27377SValentina Manea 9696c27377SValentina Manea spin_unlock_irq(&sdev->ud.lock); 9796c27377SValentina Manea 9896c27377SValentina Manea usbip_event_add(&sdev->ud, SDEV_EVENT_DOWN); 9996c27377SValentina Manea } 10096c27377SValentina Manea 10196c27377SValentina Manea return count; 10296c27377SValentina Manea 10396c27377SValentina Manea err: 10496c27377SValentina Manea spin_unlock_irq(&sdev->ud.lock); 10596c27377SValentina Manea return -EINVAL; 10696c27377SValentina Manea } 107ca35910aSGreg Kroah-Hartman static DEVICE_ATTR_WO(usbip_sockfd); 10896c27377SValentina Manea 10996c27377SValentina Manea static int stub_add_files(struct device *dev) 11096c27377SValentina Manea { 11196c27377SValentina Manea int err = 0; 11296c27377SValentina Manea 11396c27377SValentina Manea err = device_create_file(dev, &dev_attr_usbip_status); 11496c27377SValentina Manea if (err) 11596c27377SValentina Manea goto err_status; 11696c27377SValentina Manea 11796c27377SValentina Manea err = device_create_file(dev, &dev_attr_usbip_sockfd); 11896c27377SValentina Manea if (err) 11996c27377SValentina Manea goto err_sockfd; 12096c27377SValentina Manea 12196c27377SValentina Manea err = device_create_file(dev, &dev_attr_usbip_debug); 12296c27377SValentina Manea if (err) 12396c27377SValentina Manea goto err_debug; 12496c27377SValentina Manea 12596c27377SValentina Manea return 0; 12696c27377SValentina Manea 12796c27377SValentina Manea err_debug: 12896c27377SValentina Manea device_remove_file(dev, &dev_attr_usbip_sockfd); 12996c27377SValentina Manea err_sockfd: 13096c27377SValentina Manea device_remove_file(dev, &dev_attr_usbip_status); 13196c27377SValentina Manea err_status: 13296c27377SValentina Manea return err; 13396c27377SValentina Manea } 13496c27377SValentina Manea 13596c27377SValentina Manea static void stub_remove_files(struct device *dev) 13696c27377SValentina Manea { 13796c27377SValentina Manea device_remove_file(dev, &dev_attr_usbip_status); 13896c27377SValentina Manea device_remove_file(dev, &dev_attr_usbip_sockfd); 13996c27377SValentina Manea device_remove_file(dev, &dev_attr_usbip_debug); 14096c27377SValentina Manea } 14196c27377SValentina Manea 14296c27377SValentina Manea static void stub_shutdown_connection(struct usbip_device *ud) 14396c27377SValentina Manea { 14496c27377SValentina Manea struct stub_device *sdev = container_of(ud, struct stub_device, ud); 14596c27377SValentina Manea 14696c27377SValentina Manea /* 14796c27377SValentina Manea * When removing an exported device, kernel panic sometimes occurred 14896c27377SValentina Manea * and then EIP was sk_wait_data of stub_rx thread. Is this because 14996c27377SValentina Manea * sk_wait_data returned though stub_rx thread was already finished by 15096c27377SValentina Manea * step 1? 15196c27377SValentina Manea */ 15296c27377SValentina Manea if (ud->tcp_socket) { 15390120d15SShuah Khan dev_dbg(&sdev->udev->dev, "shutdown sockfd %d\n", ud->sockfd); 15496c27377SValentina Manea kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR); 15596c27377SValentina Manea } 15696c27377SValentina Manea 15796c27377SValentina Manea /* 1. stop threads */ 15896c27377SValentina Manea if (ud->tcp_rx) { 15996c27377SValentina Manea kthread_stop_put(ud->tcp_rx); 16096c27377SValentina Manea ud->tcp_rx = NULL; 16196c27377SValentina Manea } 16296c27377SValentina Manea if (ud->tcp_tx) { 16396c27377SValentina Manea kthread_stop_put(ud->tcp_tx); 16496c27377SValentina Manea ud->tcp_tx = NULL; 16596c27377SValentina Manea } 16696c27377SValentina Manea 16796c27377SValentina Manea /* 16896c27377SValentina Manea * 2. close the socket 16996c27377SValentina Manea * 17096c27377SValentina Manea * tcp_socket is freed after threads are killed so that usbip_xmit does 17196c27377SValentina Manea * not touch NULL socket. 17296c27377SValentina Manea */ 17396c27377SValentina Manea if (ud->tcp_socket) { 17496c27377SValentina Manea sockfd_put(ud->tcp_socket); 17596c27377SValentina Manea ud->tcp_socket = NULL; 176009f41aeSShuah Khan ud->sockfd = -1; 17796c27377SValentina Manea } 17896c27377SValentina Manea 17996c27377SValentina Manea /* 3. free used data */ 18096c27377SValentina Manea stub_device_cleanup_urbs(sdev); 18196c27377SValentina Manea 18296c27377SValentina Manea /* 4. free stub_unlink */ 18396c27377SValentina Manea { 18496c27377SValentina Manea unsigned long flags; 18596c27377SValentina Manea struct stub_unlink *unlink, *tmp; 18696c27377SValentina Manea 18796c27377SValentina Manea spin_lock_irqsave(&sdev->priv_lock, flags); 18896c27377SValentina Manea list_for_each_entry_safe(unlink, tmp, &sdev->unlink_tx, list) { 18996c27377SValentina Manea list_del(&unlink->list); 19096c27377SValentina Manea kfree(unlink); 19196c27377SValentina Manea } 19296c27377SValentina Manea list_for_each_entry_safe(unlink, tmp, &sdev->unlink_free, 19396c27377SValentina Manea list) { 19496c27377SValentina Manea list_del(&unlink->list); 19596c27377SValentina Manea kfree(unlink); 19696c27377SValentina Manea } 19796c27377SValentina Manea spin_unlock_irqrestore(&sdev->priv_lock, flags); 19896c27377SValentina Manea } 19996c27377SValentina Manea } 20096c27377SValentina Manea 20196c27377SValentina Manea static void stub_device_reset(struct usbip_device *ud) 20296c27377SValentina Manea { 20396c27377SValentina Manea struct stub_device *sdev = container_of(ud, struct stub_device, ud); 20496c27377SValentina Manea struct usb_device *udev = sdev->udev; 20596c27377SValentina Manea int ret; 20696c27377SValentina Manea 20796c27377SValentina Manea dev_dbg(&udev->dev, "device reset"); 20896c27377SValentina Manea 2098c7003a3SAlexander Popov ret = usb_lock_device_for_reset(udev, NULL); 21096c27377SValentina Manea if (ret < 0) { 21196c27377SValentina Manea dev_err(&udev->dev, "lock for reset\n"); 21296c27377SValentina Manea spin_lock_irq(&ud->lock); 21396c27377SValentina Manea ud->status = SDEV_ST_ERROR; 21496c27377SValentina Manea spin_unlock_irq(&ud->lock); 21596c27377SValentina Manea return; 21696c27377SValentina Manea } 21796c27377SValentina Manea 21896c27377SValentina Manea /* try to reset the device */ 21996c27377SValentina Manea ret = usb_reset_device(udev); 22096c27377SValentina Manea usb_unlock_device(udev); 22196c27377SValentina Manea 22296c27377SValentina Manea spin_lock_irq(&ud->lock); 22396c27377SValentina Manea if (ret) { 22496c27377SValentina Manea dev_err(&udev->dev, "device reset\n"); 22596c27377SValentina Manea ud->status = SDEV_ST_ERROR; 22696c27377SValentina Manea } else { 22796c27377SValentina Manea dev_info(&udev->dev, "device reset\n"); 22896c27377SValentina Manea ud->status = SDEV_ST_AVAILABLE; 22996c27377SValentina Manea } 23096c27377SValentina Manea spin_unlock_irq(&ud->lock); 23196c27377SValentina Manea } 23296c27377SValentina Manea 23396c27377SValentina Manea static void stub_device_unusable(struct usbip_device *ud) 23496c27377SValentina Manea { 23596c27377SValentina Manea spin_lock_irq(&ud->lock); 23696c27377SValentina Manea ud->status = SDEV_ST_ERROR; 23796c27377SValentina Manea spin_unlock_irq(&ud->lock); 23896c27377SValentina Manea } 23996c27377SValentina Manea 24096c27377SValentina Manea /** 24196c27377SValentina Manea * stub_device_alloc - allocate a new stub_device struct 2428c7003a3SAlexander Popov * @udev: usb_device of a new device 24396c27377SValentina Manea * 24496c27377SValentina Manea * Allocates and initializes a new stub_device struct. 24596c27377SValentina Manea */ 24696c27377SValentina Manea static struct stub_device *stub_device_alloc(struct usb_device *udev) 24796c27377SValentina Manea { 24896c27377SValentina Manea struct stub_device *sdev; 24996c27377SValentina Manea int busnum = udev->bus->busnum; 25096c27377SValentina Manea int devnum = udev->devnum; 25196c27377SValentina Manea 25296c27377SValentina Manea dev_dbg(&udev->dev, "allocating stub device"); 25396c27377SValentina Manea 25496c27377SValentina Manea /* yes, it's a new device */ 25596c27377SValentina Manea sdev = kzalloc(sizeof(struct stub_device), GFP_KERNEL); 25696c27377SValentina Manea if (!sdev) 25796c27377SValentina Manea return NULL; 25896c27377SValentina Manea 25996c27377SValentina Manea sdev->udev = usb_get_dev(udev); 26096c27377SValentina Manea 26196c27377SValentina Manea /* 26296c27377SValentina Manea * devid is defined with devnum when this driver is first allocated. 26396c27377SValentina Manea * devnum may change later if a device is reset. However, devid never 26496c27377SValentina Manea * changes during a usbip connection. 26596c27377SValentina Manea */ 26696c27377SValentina Manea sdev->devid = (busnum << 16) | devnum; 26796c27377SValentina Manea sdev->ud.side = USBIP_STUB; 26896c27377SValentina Manea sdev->ud.status = SDEV_ST_AVAILABLE; 26996c27377SValentina Manea spin_lock_init(&sdev->ud.lock); 27096c27377SValentina Manea sdev->ud.tcp_socket = NULL; 271009f41aeSShuah Khan sdev->ud.sockfd = -1; 27296c27377SValentina Manea 27396c27377SValentina Manea INIT_LIST_HEAD(&sdev->priv_init); 27496c27377SValentina Manea INIT_LIST_HEAD(&sdev->priv_tx); 27596c27377SValentina Manea INIT_LIST_HEAD(&sdev->priv_free); 27696c27377SValentina Manea INIT_LIST_HEAD(&sdev->unlink_free); 27796c27377SValentina Manea INIT_LIST_HEAD(&sdev->unlink_tx); 27896c27377SValentina Manea spin_lock_init(&sdev->priv_lock); 27996c27377SValentina Manea 28096c27377SValentina Manea init_waitqueue_head(&sdev->tx_waitq); 28196c27377SValentina Manea 28296c27377SValentina Manea sdev->ud.eh_ops.shutdown = stub_shutdown_connection; 28396c27377SValentina Manea sdev->ud.eh_ops.reset = stub_device_reset; 28496c27377SValentina Manea sdev->ud.eh_ops.unusable = stub_device_unusable; 28596c27377SValentina Manea 28696c27377SValentina Manea usbip_start_eh(&sdev->ud); 28796c27377SValentina Manea 28896c27377SValentina Manea dev_dbg(&udev->dev, "register new device\n"); 28996c27377SValentina Manea 29096c27377SValentina Manea return sdev; 29196c27377SValentina Manea } 29296c27377SValentina Manea 29396c27377SValentina Manea static void stub_device_free(struct stub_device *sdev) 29496c27377SValentina Manea { 29596c27377SValentina Manea kfree(sdev); 29696c27377SValentina Manea } 29796c27377SValentina Manea 29896c27377SValentina Manea static int stub_probe(struct usb_device *udev) 29996c27377SValentina Manea { 30096c27377SValentina Manea struct stub_device *sdev = NULL; 30196c27377SValentina Manea const char *udev_busid = dev_name(&udev->dev); 30296c27377SValentina Manea struct bus_id_priv *busid_priv; 30322076557SShuah Khan (Samsung OSG) int rc = 0; 3040c9e8b3cSShuah Khan char save_status; 30596c27377SValentina Manea 30628b68accSShuah Khan dev_dbg(&udev->dev, "Enter probe\n"); 30796c27377SValentina Manea 3080c9e8b3cSShuah Khan /* Not sure if this is our device. Allocate here to avoid 3090c9e8b3cSShuah Khan * calling alloc while holding busid_table lock. 3100c9e8b3cSShuah Khan */ 3110c9e8b3cSShuah Khan sdev = stub_device_alloc(udev); 3120c9e8b3cSShuah Khan if (!sdev) 3130c9e8b3cSShuah Khan return -ENOMEM; 3140c9e8b3cSShuah Khan 31596c27377SValentina Manea /* check we should claim or not by busid_table */ 31696c27377SValentina Manea busid_priv = get_busid_priv(udev_busid); 31796c27377SValentina Manea if (!busid_priv || (busid_priv->status == STUB_BUSID_REMOV) || 31896c27377SValentina Manea (busid_priv->status == STUB_BUSID_OTHER)) { 31996c27377SValentina Manea dev_info(&udev->dev, 32096c27377SValentina Manea "%s is not in match_busid table... skip!\n", 32196c27377SValentina Manea udev_busid); 32296c27377SValentina Manea 32396c27377SValentina Manea /* 32496c27377SValentina Manea * Return value should be ENODEV or ENOXIO to continue trying 32596c27377SValentina Manea * other matched drivers by the driver core. 32696c27377SValentina Manea * See driver_probe_device() in driver/base/dd.c 32796c27377SValentina Manea */ 32822076557SShuah Khan (Samsung OSG) rc = -ENODEV; 3293ea3091fSShuah Khan if (!busid_priv) 3300c9e8b3cSShuah Khan goto sdev_free; 3313ea3091fSShuah Khan 3323ea3091fSShuah Khan goto call_put_busid_priv; 33396c27377SValentina Manea } 33496c27377SValentina Manea 33596c27377SValentina Manea if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) { 33696c27377SValentina Manea dev_dbg(&udev->dev, "%s is a usb hub device... skip!\n", 33796c27377SValentina Manea udev_busid); 33822076557SShuah Khan (Samsung OSG) rc = -ENODEV; 3393ea3091fSShuah Khan goto call_put_busid_priv; 34096c27377SValentina Manea } 34196c27377SValentina Manea 34296c27377SValentina Manea if (!strcmp(udev->bus->bus_name, "vhci_hcd")) { 34396c27377SValentina Manea dev_dbg(&udev->dev, 34496c27377SValentina Manea "%s is attached on vhci_hcd... skip!\n", 34596c27377SValentina Manea udev_busid); 34696c27377SValentina Manea 34722076557SShuah Khan (Samsung OSG) rc = -ENODEV; 3483ea3091fSShuah Khan goto call_put_busid_priv; 34996c27377SValentina Manea } 35096c27377SValentina Manea 35196c27377SValentina Manea 35296c27377SValentina Manea dev_info(&udev->dev, 35396c27377SValentina Manea "usbip-host: register new device (bus %u dev %u)\n", 35496c27377SValentina Manea udev->bus->busnum, udev->devnum); 35596c27377SValentina Manea 35696c27377SValentina Manea busid_priv->shutdown_busid = 0; 35796c27377SValentina Manea 35896c27377SValentina Manea /* set private data to usb_device */ 35996c27377SValentina Manea dev_set_drvdata(&udev->dev, sdev); 3600c9e8b3cSShuah Khan 36196c27377SValentina Manea busid_priv->sdev = sdev; 36296c27377SValentina Manea busid_priv->udev = udev; 36396c27377SValentina Manea 3640c9e8b3cSShuah Khan save_status = busid_priv->status; 3650c9e8b3cSShuah Khan busid_priv->status = STUB_BUSID_ALLOC; 3660c9e8b3cSShuah Khan 3673ea3091fSShuah Khan /* release the busid_lock */ 3683ea3091fSShuah Khan put_busid_priv(busid_priv); 3693ea3091fSShuah Khan 37096c27377SValentina Manea /* 37196c27377SValentina Manea * Claim this hub port. 37296c27377SValentina Manea * It doesn't matter what value we pass as owner 37396c27377SValentina Manea * (struct dev_state) as long as it is unique. 37496c27377SValentina Manea */ 37596c27377SValentina Manea rc = usb_hub_claim_port(udev->parent, udev->portnum, 37696c27377SValentina Manea (struct usb_dev_state *) udev); 37796c27377SValentina Manea if (rc) { 37896c27377SValentina Manea dev_dbg(&udev->dev, "unable to claim port\n"); 3793ff67445SAlexey Khoroshilov goto err_port; 38096c27377SValentina Manea } 38196c27377SValentina Manea 3823ff67445SAlexey Khoroshilov rc = stub_add_files(&udev->dev); 3833ff67445SAlexey Khoroshilov if (rc) { 38496c27377SValentina Manea dev_err(&udev->dev, "stub_add_files for %s\n", udev_busid); 3853ff67445SAlexey Khoroshilov goto err_files; 3863ff67445SAlexey Khoroshilov } 3873ff67445SAlexey Khoroshilov 3880c9e8b3cSShuah Khan return 0; 38922076557SShuah Khan (Samsung OSG) 3903ff67445SAlexey Khoroshilov err_files: 3913ff67445SAlexey Khoroshilov usb_hub_release_port(udev->parent, udev->portnum, 3923ff67445SAlexey Khoroshilov (struct usb_dev_state *) udev); 3933ff67445SAlexey Khoroshilov err_port: 39496c27377SValentina Manea dev_set_drvdata(&udev->dev, NULL); 39596c27377SValentina Manea usb_put_dev(udev); 39696c27377SValentina Manea 3970c9e8b3cSShuah Khan /* we already have busid_priv, just lock busid_lock */ 3980c9e8b3cSShuah Khan spin_lock(&busid_priv->busid_lock); 39996c27377SValentina Manea busid_priv->sdev = NULL; 4000c9e8b3cSShuah Khan busid_priv->status = save_status; 4013ea3091fSShuah Khan spin_unlock(&busid_priv->busid_lock); 4023ea3091fSShuah Khan /* lock is released - go to free */ 4033ea3091fSShuah Khan goto sdev_free; 4043ea3091fSShuah Khan 4053ea3091fSShuah Khan call_put_busid_priv: 4060c9e8b3cSShuah Khan /* release the busid_lock */ 40722076557SShuah Khan (Samsung OSG) put_busid_priv(busid_priv); 4080c9e8b3cSShuah Khan 4093ea3091fSShuah Khan sdev_free: 4103ea3091fSShuah Khan stub_device_free(sdev); 4113ea3091fSShuah Khan 4123ff67445SAlexey Khoroshilov return rc; 41396c27377SValentina Manea } 41496c27377SValentina Manea 41596c27377SValentina Manea static void shutdown_busid(struct bus_id_priv *busid_priv) 41696c27377SValentina Manea { 41796c27377SValentina Manea usbip_event_add(&busid_priv->sdev->ud, SDEV_EVENT_REMOVED); 41896c27377SValentina Manea 41996c27377SValentina Manea /* wait for the stop of the event handler */ 42096c27377SValentina Manea usbip_stop_eh(&busid_priv->sdev->ud); 42196c27377SValentina Manea } 42296c27377SValentina Manea 42396c27377SValentina Manea /* 42496c27377SValentina Manea * called in usb_disconnect() or usb_deregister() 42596c27377SValentina Manea * but only if actconfig(active configuration) exists 42696c27377SValentina Manea */ 42796c27377SValentina Manea static void stub_disconnect(struct usb_device *udev) 42896c27377SValentina Manea { 42996c27377SValentina Manea struct stub_device *sdev; 43096c27377SValentina Manea const char *udev_busid = dev_name(&udev->dev); 43196c27377SValentina Manea struct bus_id_priv *busid_priv; 43296c27377SValentina Manea int rc; 43396c27377SValentina Manea 43428b68accSShuah Khan dev_dbg(&udev->dev, "Enter disconnect\n"); 43596c27377SValentina Manea 43696c27377SValentina Manea busid_priv = get_busid_priv(udev_busid); 43796c27377SValentina Manea if (!busid_priv) { 43896c27377SValentina Manea BUG(); 43996c27377SValentina Manea return; 44096c27377SValentina Manea } 44196c27377SValentina Manea 44296c27377SValentina Manea sdev = dev_get_drvdata(&udev->dev); 44396c27377SValentina Manea 44496c27377SValentina Manea /* get stub_device */ 44596c27377SValentina Manea if (!sdev) { 44696c27377SValentina Manea dev_err(&udev->dev, "could not get device"); 4473ea3091fSShuah Khan /* release busid_lock */ 4483ea3091fSShuah Khan put_busid_priv(busid_priv); 4493ea3091fSShuah Khan return; 45096c27377SValentina Manea } 45196c27377SValentina Manea 45296c27377SValentina Manea dev_set_drvdata(&udev->dev, NULL); 45396c27377SValentina Manea 4540c9e8b3cSShuah Khan /* release busid_lock before call to remove device files */ 4550c9e8b3cSShuah Khan put_busid_priv(busid_priv); 4560c9e8b3cSShuah Khan 45796c27377SValentina Manea /* 45896c27377SValentina Manea * NOTE: rx/tx threads are invoked for each usb_device. 45996c27377SValentina Manea */ 46096c27377SValentina Manea stub_remove_files(&udev->dev); 46196c27377SValentina Manea 46296c27377SValentina Manea /* release port */ 46396c27377SValentina Manea rc = usb_hub_release_port(udev->parent, udev->portnum, 46496c27377SValentina Manea (struct usb_dev_state *) udev); 46596c27377SValentina Manea if (rc) { 46696c27377SValentina Manea dev_dbg(&udev->dev, "unable to release port\n"); 4670c9e8b3cSShuah Khan return; 46896c27377SValentina Manea } 46996c27377SValentina Manea 47096c27377SValentina Manea /* If usb reset is called from event handler */ 471bb7871adSNobuo Iwata if (usbip_in_eh(current)) 4720c9e8b3cSShuah Khan return; 4730c9e8b3cSShuah Khan 4740c9e8b3cSShuah Khan /* we already have busid_priv, just lock busid_lock */ 4750c9e8b3cSShuah Khan spin_lock(&busid_priv->busid_lock); 4760c9e8b3cSShuah Khan if (!busid_priv->shutdown_busid) 4770c9e8b3cSShuah Khan busid_priv->shutdown_busid = 1; 4780c9e8b3cSShuah Khan /* release busid_lock */ 4793ea3091fSShuah Khan spin_unlock(&busid_priv->busid_lock); 48096c27377SValentina Manea 48196c27377SValentina Manea /* shutdown the current connection */ 48296c27377SValentina Manea shutdown_busid(busid_priv); 48396c27377SValentina Manea 48496c27377SValentina Manea usb_put_dev(sdev->udev); 48596c27377SValentina Manea 4860c9e8b3cSShuah Khan /* we already have busid_priv, just lock busid_lock */ 4870c9e8b3cSShuah Khan spin_lock(&busid_priv->busid_lock); 48896c27377SValentina Manea /* free sdev */ 48996c27377SValentina Manea busid_priv->sdev = NULL; 49096c27377SValentina Manea stub_device_free(sdev); 49196c27377SValentina Manea 4927510df3fSShuah Khan (Samsung OSG) if (busid_priv->status == STUB_BUSID_ALLOC) 49396c27377SValentina Manea busid_priv->status = STUB_BUSID_ADDED; 4940c9e8b3cSShuah Khan /* release busid_lock */ 4953ea3091fSShuah Khan spin_unlock(&busid_priv->busid_lock); 4963ea3091fSShuah Khan return; 49796c27377SValentina Manea } 49896c27377SValentina Manea 49996c27377SValentina Manea #ifdef CONFIG_PM 50096c27377SValentina Manea 50196c27377SValentina Manea /* These functions need usb_port_suspend and usb_port_resume, 50296c27377SValentina Manea * which reside in drivers/usb/core/usb.h. Skip for now. */ 50396c27377SValentina Manea 50496c27377SValentina Manea static int stub_suspend(struct usb_device *udev, pm_message_t message) 50596c27377SValentina Manea { 50696c27377SValentina Manea dev_dbg(&udev->dev, "stub_suspend\n"); 50796c27377SValentina Manea 50896c27377SValentina Manea return 0; 50996c27377SValentina Manea } 51096c27377SValentina Manea 51196c27377SValentina Manea static int stub_resume(struct usb_device *udev, pm_message_t message) 51296c27377SValentina Manea { 51396c27377SValentina Manea dev_dbg(&udev->dev, "stub_resume\n"); 51496c27377SValentina Manea 51596c27377SValentina Manea return 0; 51696c27377SValentina Manea } 51796c27377SValentina Manea 51896c27377SValentina Manea #endif /* CONFIG_PM */ 51996c27377SValentina Manea 52096c27377SValentina Manea struct usb_device_driver stub_driver = { 52196c27377SValentina Manea .name = "usbip-host", 52296c27377SValentina Manea .probe = stub_probe, 52396c27377SValentina Manea .disconnect = stub_disconnect, 52496c27377SValentina Manea #ifdef CONFIG_PM 52596c27377SValentina Manea .suspend = stub_suspend, 52696c27377SValentina Manea .resume = stub_resume, 52796c27377SValentina Manea #endif 52896c27377SValentina Manea .supports_autosuspend = 0, 52996c27377SValentina Manea }; 530