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530 lines
12 KiB
530 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright (C) 2003-2008 Takahiro Hirofuchi |
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*/ |
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#include <linux/device.h> |
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#include <linux/file.h> |
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#include <linux/kthread.h> |
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#include <linux/module.h> |
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#include "usbip_common.h" |
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#include "stub.h" |
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/* |
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* usbip_status shows the status of usbip-host as long as this driver is bound |
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* to the target device. |
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*/ |
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static ssize_t usbip_status_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct stub_device *sdev = dev_get_drvdata(dev); |
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int status; |
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if (!sdev) { |
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dev_err(dev, "sdev is null\n"); |
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return -ENODEV; |
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} |
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spin_lock_irq(&sdev->ud.lock); |
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status = sdev->ud.status; |
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spin_unlock_irq(&sdev->ud.lock); |
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return snprintf(buf, PAGE_SIZE, "%d\n", status); |
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} |
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static DEVICE_ATTR_RO(usbip_status); |
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/* |
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* usbip_sockfd gets a socket descriptor of an established TCP connection that |
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* is used to transfer usbip requests by kernel threads. -1 is a magic number |
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* by which usbip connection is finished. |
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*/ |
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static ssize_t usbip_sockfd_store(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct stub_device *sdev = dev_get_drvdata(dev); |
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int sockfd = 0; |
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struct socket *socket; |
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int rv; |
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struct task_struct *tcp_rx = NULL; |
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struct task_struct *tcp_tx = NULL; |
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if (!sdev) { |
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dev_err(dev, "sdev is null\n"); |
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return -ENODEV; |
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} |
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rv = sscanf(buf, "%d", &sockfd); |
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if (rv != 1) |
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return -EINVAL; |
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if (sockfd != -1) { |
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int err; |
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dev_info(dev, "stub up\n"); |
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mutex_lock(&sdev->ud.sysfs_lock); |
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spin_lock_irq(&sdev->ud.lock); |
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if (sdev->ud.status != SDEV_ST_AVAILABLE) { |
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dev_err(dev, "not ready\n"); |
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goto err; |
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} |
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socket = sockfd_lookup(sockfd, &err); |
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if (!socket) { |
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dev_err(dev, "failed to lookup sock"); |
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goto err; |
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} |
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if (socket->type != SOCK_STREAM) { |
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dev_err(dev, "Expecting SOCK_STREAM - found %d", |
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socket->type); |
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goto sock_err; |
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} |
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/* unlock and create threads and get tasks */ |
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spin_unlock_irq(&sdev->ud.lock); |
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tcp_rx = kthread_create(stub_rx_loop, &sdev->ud, "stub_rx"); |
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if (IS_ERR(tcp_rx)) { |
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sockfd_put(socket); |
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goto unlock_mutex; |
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} |
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tcp_tx = kthread_create(stub_tx_loop, &sdev->ud, "stub_tx"); |
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if (IS_ERR(tcp_tx)) { |
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kthread_stop(tcp_rx); |
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sockfd_put(socket); |
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goto unlock_mutex; |
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} |
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/* get task structs now */ |
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get_task_struct(tcp_rx); |
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get_task_struct(tcp_tx); |
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/* lock and update sdev->ud state */ |
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spin_lock_irq(&sdev->ud.lock); |
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sdev->ud.tcp_socket = socket; |
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sdev->ud.sockfd = sockfd; |
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sdev->ud.tcp_rx = tcp_rx; |
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sdev->ud.tcp_tx = tcp_tx; |
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sdev->ud.status = SDEV_ST_USED; |
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spin_unlock_irq(&sdev->ud.lock); |
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wake_up_process(sdev->ud.tcp_rx); |
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wake_up_process(sdev->ud.tcp_tx); |
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mutex_unlock(&sdev->ud.sysfs_lock); |
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} else { |
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dev_info(dev, "stub down\n"); |
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spin_lock_irq(&sdev->ud.lock); |
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if (sdev->ud.status != SDEV_ST_USED) |
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goto err; |
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spin_unlock_irq(&sdev->ud.lock); |
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usbip_event_add(&sdev->ud, SDEV_EVENT_DOWN); |
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mutex_unlock(&sdev->ud.sysfs_lock); |
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} |
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return count; |
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sock_err: |
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sockfd_put(socket); |
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err: |
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spin_unlock_irq(&sdev->ud.lock); |
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unlock_mutex: |
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mutex_unlock(&sdev->ud.sysfs_lock); |
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return -EINVAL; |
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} |
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static DEVICE_ATTR_WO(usbip_sockfd); |
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static struct attribute *usbip_attrs[] = { |
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&dev_attr_usbip_status.attr, |
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&dev_attr_usbip_sockfd.attr, |
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&dev_attr_usbip_debug.attr, |
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NULL, |
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}; |
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ATTRIBUTE_GROUPS(usbip); |
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static void stub_shutdown_connection(struct usbip_device *ud) |
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{ |
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struct stub_device *sdev = container_of(ud, struct stub_device, ud); |
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/* |
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* When removing an exported device, kernel panic sometimes occurred |
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* and then EIP was sk_wait_data of stub_rx thread. Is this because |
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* sk_wait_data returned though stub_rx thread was already finished by |
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* step 1? |
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*/ |
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if (ud->tcp_socket) { |
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dev_dbg(&sdev->udev->dev, "shutdown sockfd %d\n", ud->sockfd); |
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kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR); |
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} |
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/* 1. stop threads */ |
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if (ud->tcp_rx) { |
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kthread_stop_put(ud->tcp_rx); |
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ud->tcp_rx = NULL; |
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} |
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if (ud->tcp_tx) { |
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kthread_stop_put(ud->tcp_tx); |
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ud->tcp_tx = NULL; |
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} |
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/* |
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* 2. close the socket |
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* |
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* tcp_socket is freed after threads are killed so that usbip_xmit does |
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* not touch NULL socket. |
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*/ |
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if (ud->tcp_socket) { |
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sockfd_put(ud->tcp_socket); |
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ud->tcp_socket = NULL; |
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ud->sockfd = -1; |
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} |
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/* 3. free used data */ |
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stub_device_cleanup_urbs(sdev); |
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/* 4. free stub_unlink */ |
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{ |
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unsigned long flags; |
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struct stub_unlink *unlink, *tmp; |
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spin_lock_irqsave(&sdev->priv_lock, flags); |
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list_for_each_entry_safe(unlink, tmp, &sdev->unlink_tx, list) { |
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list_del(&unlink->list); |
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kfree(unlink); |
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} |
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list_for_each_entry_safe(unlink, tmp, &sdev->unlink_free, |
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list) { |
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list_del(&unlink->list); |
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kfree(unlink); |
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} |
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spin_unlock_irqrestore(&sdev->priv_lock, flags); |
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} |
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} |
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static void stub_device_reset(struct usbip_device *ud) |
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{ |
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struct stub_device *sdev = container_of(ud, struct stub_device, ud); |
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struct usb_device *udev = sdev->udev; |
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int ret; |
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dev_dbg(&udev->dev, "device reset"); |
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ret = usb_lock_device_for_reset(udev, NULL); |
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if (ret < 0) { |
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dev_err(&udev->dev, "lock for reset\n"); |
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spin_lock_irq(&ud->lock); |
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ud->status = SDEV_ST_ERROR; |
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spin_unlock_irq(&ud->lock); |
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return; |
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} |
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/* try to reset the device */ |
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ret = usb_reset_device(udev); |
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usb_unlock_device(udev); |
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spin_lock_irq(&ud->lock); |
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if (ret) { |
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dev_err(&udev->dev, "device reset\n"); |
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ud->status = SDEV_ST_ERROR; |
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} else { |
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dev_info(&udev->dev, "device reset\n"); |
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ud->status = SDEV_ST_AVAILABLE; |
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} |
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spin_unlock_irq(&ud->lock); |
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} |
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static void stub_device_unusable(struct usbip_device *ud) |
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{ |
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spin_lock_irq(&ud->lock); |
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ud->status = SDEV_ST_ERROR; |
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spin_unlock_irq(&ud->lock); |
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} |
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/** |
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* stub_device_alloc - allocate a new stub_device struct |
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* @udev: usb_device of a new device |
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* |
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* Allocates and initializes a new stub_device struct. |
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*/ |
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static struct stub_device *stub_device_alloc(struct usb_device *udev) |
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{ |
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struct stub_device *sdev; |
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int busnum = udev->bus->busnum; |
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int devnum = udev->devnum; |
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dev_dbg(&udev->dev, "allocating stub device"); |
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/* yes, it's a new device */ |
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sdev = kzalloc(sizeof(struct stub_device), GFP_KERNEL); |
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if (!sdev) |
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return NULL; |
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sdev->udev = usb_get_dev(udev); |
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/* |
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* devid is defined with devnum when this driver is first allocated. |
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* devnum may change later if a device is reset. However, devid never |
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* changes during a usbip connection. |
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*/ |
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sdev->devid = (busnum << 16) | devnum; |
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sdev->ud.side = USBIP_STUB; |
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sdev->ud.status = SDEV_ST_AVAILABLE; |
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spin_lock_init(&sdev->ud.lock); |
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mutex_init(&sdev->ud.sysfs_lock); |
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sdev->ud.tcp_socket = NULL; |
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sdev->ud.sockfd = -1; |
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INIT_LIST_HEAD(&sdev->priv_init); |
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INIT_LIST_HEAD(&sdev->priv_tx); |
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INIT_LIST_HEAD(&sdev->priv_free); |
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INIT_LIST_HEAD(&sdev->unlink_free); |
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INIT_LIST_HEAD(&sdev->unlink_tx); |
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spin_lock_init(&sdev->priv_lock); |
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init_waitqueue_head(&sdev->tx_waitq); |
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sdev->ud.eh_ops.shutdown = stub_shutdown_connection; |
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sdev->ud.eh_ops.reset = stub_device_reset; |
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sdev->ud.eh_ops.unusable = stub_device_unusable; |
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usbip_start_eh(&sdev->ud); |
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dev_dbg(&udev->dev, "register new device\n"); |
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return sdev; |
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} |
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static void stub_device_free(struct stub_device *sdev) |
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{ |
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kfree(sdev); |
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} |
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static int stub_probe(struct usb_device *udev) |
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{ |
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struct stub_device *sdev = NULL; |
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const char *udev_busid = dev_name(&udev->dev); |
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struct bus_id_priv *busid_priv; |
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int rc = 0; |
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char save_status; |
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dev_dbg(&udev->dev, "Enter probe\n"); |
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/* Not sure if this is our device. Allocate here to avoid |
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* calling alloc while holding busid_table lock. |
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*/ |
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sdev = stub_device_alloc(udev); |
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if (!sdev) |
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return -ENOMEM; |
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/* check we should claim or not by busid_table */ |
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busid_priv = get_busid_priv(udev_busid); |
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if (!busid_priv || (busid_priv->status == STUB_BUSID_REMOV) || |
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(busid_priv->status == STUB_BUSID_OTHER)) { |
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dev_info(&udev->dev, |
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"%s is not in match_busid table... skip!\n", |
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udev_busid); |
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/* |
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* Return value should be ENODEV or ENOXIO to continue trying |
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* other matched drivers by the driver core. |
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* See driver_probe_device() in driver/base/dd.c |
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*/ |
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rc = -ENODEV; |
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if (!busid_priv) |
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goto sdev_free; |
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goto call_put_busid_priv; |
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} |
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if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) { |
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dev_dbg(&udev->dev, "%s is a usb hub device... skip!\n", |
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udev_busid); |
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rc = -ENODEV; |
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goto call_put_busid_priv; |
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} |
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if (!strcmp(udev->bus->bus_name, "vhci_hcd")) { |
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dev_dbg(&udev->dev, |
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"%s is attached on vhci_hcd... skip!\n", |
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udev_busid); |
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rc = -ENODEV; |
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goto call_put_busid_priv; |
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} |
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dev_info(&udev->dev, |
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"usbip-host: register new device (bus %u dev %u)\n", |
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udev->bus->busnum, udev->devnum); |
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busid_priv->shutdown_busid = 0; |
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/* set private data to usb_device */ |
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dev_set_drvdata(&udev->dev, sdev); |
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busid_priv->sdev = sdev; |
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busid_priv->udev = udev; |
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save_status = busid_priv->status; |
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busid_priv->status = STUB_BUSID_ALLOC; |
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/* release the busid_lock */ |
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put_busid_priv(busid_priv); |
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/* |
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* Claim this hub port. |
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* It doesn't matter what value we pass as owner |
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* (struct dev_state) as long as it is unique. |
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*/ |
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rc = usb_hub_claim_port(udev->parent, udev->portnum, |
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(struct usb_dev_state *) udev); |
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if (rc) { |
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dev_dbg(&udev->dev, "unable to claim port\n"); |
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goto err_port; |
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} |
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return 0; |
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err_port: |
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dev_set_drvdata(&udev->dev, NULL); |
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usb_put_dev(udev); |
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/* we already have busid_priv, just lock busid_lock */ |
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spin_lock(&busid_priv->busid_lock); |
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busid_priv->sdev = NULL; |
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busid_priv->status = save_status; |
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spin_unlock(&busid_priv->busid_lock); |
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/* lock is released - go to free */ |
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goto sdev_free; |
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call_put_busid_priv: |
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/* release the busid_lock */ |
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put_busid_priv(busid_priv); |
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sdev_free: |
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stub_device_free(sdev); |
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return rc; |
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} |
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static void shutdown_busid(struct bus_id_priv *busid_priv) |
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{ |
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usbip_event_add(&busid_priv->sdev->ud, SDEV_EVENT_REMOVED); |
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/* wait for the stop of the event handler */ |
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usbip_stop_eh(&busid_priv->sdev->ud); |
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} |
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/* |
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* called in usb_disconnect() or usb_deregister() |
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* but only if actconfig(active configuration) exists |
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*/ |
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static void stub_disconnect(struct usb_device *udev) |
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{ |
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struct stub_device *sdev; |
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const char *udev_busid = dev_name(&udev->dev); |
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struct bus_id_priv *busid_priv; |
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int rc; |
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dev_dbg(&udev->dev, "Enter disconnect\n"); |
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busid_priv = get_busid_priv(udev_busid); |
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if (!busid_priv) { |
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BUG(); |
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return; |
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} |
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sdev = dev_get_drvdata(&udev->dev); |
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/* get stub_device */ |
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if (!sdev) { |
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dev_err(&udev->dev, "could not get device"); |
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/* release busid_lock */ |
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put_busid_priv(busid_priv); |
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return; |
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} |
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dev_set_drvdata(&udev->dev, NULL); |
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/* release busid_lock before call to remove device files */ |
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put_busid_priv(busid_priv); |
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/* |
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* NOTE: rx/tx threads are invoked for each usb_device. |
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*/ |
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/* release port */ |
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rc = usb_hub_release_port(udev->parent, udev->portnum, |
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(struct usb_dev_state *) udev); |
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if (rc) { |
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dev_dbg(&udev->dev, "unable to release port\n"); |
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return; |
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} |
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/* If usb reset is called from event handler */ |
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if (usbip_in_eh(current)) |
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return; |
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/* we already have busid_priv, just lock busid_lock */ |
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spin_lock(&busid_priv->busid_lock); |
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if (!busid_priv->shutdown_busid) |
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busid_priv->shutdown_busid = 1; |
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/* release busid_lock */ |
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spin_unlock(&busid_priv->busid_lock); |
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/* shutdown the current connection */ |
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shutdown_busid(busid_priv); |
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usb_put_dev(sdev->udev); |
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/* we already have busid_priv, just lock busid_lock */ |
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spin_lock(&busid_priv->busid_lock); |
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/* free sdev */ |
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busid_priv->sdev = NULL; |
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stub_device_free(sdev); |
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if (busid_priv->status == STUB_BUSID_ALLOC) |
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busid_priv->status = STUB_BUSID_ADDED; |
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/* release busid_lock */ |
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spin_unlock(&busid_priv->busid_lock); |
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return; |
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} |
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#ifdef CONFIG_PM |
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/* These functions need usb_port_suspend and usb_port_resume, |
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* which reside in drivers/usb/core/usb.h. Skip for now. */ |
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static int stub_suspend(struct usb_device *udev, pm_message_t message) |
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{ |
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dev_dbg(&udev->dev, "stub_suspend\n"); |
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return 0; |
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} |
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static int stub_resume(struct usb_device *udev, pm_message_t message) |
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{ |
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dev_dbg(&udev->dev, "stub_resume\n"); |
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return 0; |
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} |
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#endif /* CONFIG_PM */ |
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struct usb_device_driver stub_driver = { |
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.name = "usbip-host", |
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.probe = stub_probe, |
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.disconnect = stub_disconnect, |
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#ifdef CONFIG_PM |
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.suspend = stub_suspend, |
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.resume = stub_resume, |
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#endif |
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.supports_autosuspend = 0, |
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.dev_groups = usbip_groups, |
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};
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