2008-07-09 20:56:51 +00:00
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/*
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* Copyright (C) 2003-2008 Takahiro Hirofuchi
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#include "usbip_common.h"
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2009-07-21 06:46:13 +00:00
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#include <linux/kthread.h>
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2008-07-09 20:56:51 +00:00
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static int event_handler(struct usbip_device *ud)
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{
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2009-07-21 06:46:13 +00:00
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usbip_dbg_eh("enter\n");
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2008-07-09 20:56:51 +00:00
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/*
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* Events are handled by only this thread.
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*/
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2009-07-21 06:46:13 +00:00
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while (usbip_event_happened(ud)) {
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usbip_dbg_eh("pending event %lx\n", ud->event);
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2008-07-09 20:56:51 +00:00
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/*
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* NOTE: shutdown must come first.
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* Shutdown the device.
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*/
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if (ud->event & USBIP_EH_SHUTDOWN) {
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ud->eh_ops.shutdown(ud);
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ud->event &= ~USBIP_EH_SHUTDOWN;
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break;
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}
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/* Stop the error handler. */
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if (ud->event & USBIP_EH_BYE)
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return -1;
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/* Reset the device. */
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if (ud->event & USBIP_EH_RESET) {
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ud->eh_ops.reset(ud);
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ud->event &= ~USBIP_EH_RESET;
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break;
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}
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/* Mark the device as unusable. */
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if (ud->event & USBIP_EH_UNUSABLE) {
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ud->eh_ops.unusable(ud);
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ud->event &= ~USBIP_EH_UNUSABLE;
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break;
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}
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/* NOTREACHED */
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printk(KERN_ERR "%s: unknown event\n", __func__);
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return -1;
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}
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return 0;
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}
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static void event_handler_loop(struct usbip_task *ut)
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{
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struct usbip_device *ud = container_of(ut, struct usbip_device, eh);
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while (1) {
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if (signal_pending(current)) {
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2009-07-21 06:46:13 +00:00
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usbip_dbg_eh("signal catched!\n");
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2008-07-09 20:56:51 +00:00
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break;
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}
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if (event_handler(ud) < 0)
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break;
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2009-07-21 06:46:13 +00:00
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wait_event_interruptible(ud->eh_waitq,
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usbip_event_happened(ud));
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usbip_dbg_eh("wakeup\n");
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2008-07-09 20:56:51 +00:00
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}
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}
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2009-07-21 06:46:13 +00:00
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int usbip_start_eh(struct usbip_device *ud)
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2008-07-09 20:56:51 +00:00
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{
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struct usbip_task *eh = &ud->eh;
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2009-07-21 06:46:13 +00:00
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struct task_struct *th;
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2008-07-09 20:56:51 +00:00
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init_waitqueue_head(&ud->eh_waitq);
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ud->event = 0;
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usbip_task_init(eh, "usbip_eh", event_handler_loop);
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2009-07-21 06:46:13 +00:00
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th = kthread_run(usbip_thread, (void *)eh, "usbip");
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if (IS_ERR(th)) {
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printk(KERN_WARNING
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"Unable to start control thread\n");
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return PTR_ERR(th);
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}
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2008-07-09 20:56:51 +00:00
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wait_for_completion(&eh->thread_done);
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2009-07-21 06:46:13 +00:00
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return 0;
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2008-07-09 20:56:51 +00:00
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}
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EXPORT_SYMBOL_GPL(usbip_start_eh);
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void usbip_stop_eh(struct usbip_device *ud)
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{
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struct usbip_task *eh = &ud->eh;
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wait_for_completion(&eh->thread_done);
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2009-07-21 06:46:13 +00:00
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usbip_dbg_eh("usbip_eh has finished\n");
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2008-07-09 20:56:51 +00:00
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}
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EXPORT_SYMBOL_GPL(usbip_stop_eh);
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void usbip_event_add(struct usbip_device *ud, unsigned long event)
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{
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spin_lock(&ud->lock);
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ud->event |= event;
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wake_up(&ud->eh_waitq);
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spin_unlock(&ud->lock);
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}
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EXPORT_SYMBOL_GPL(usbip_event_add);
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2009-07-21 06:46:13 +00:00
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int usbip_event_happened(struct usbip_device *ud)
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2008-07-09 20:56:51 +00:00
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{
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2009-07-21 06:46:13 +00:00
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int happened = 0;
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2008-07-09 20:56:51 +00:00
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spin_lock(&ud->lock);
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if (ud->event != 0)
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2009-07-21 06:46:13 +00:00
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happened = 1;
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2008-07-09 20:56:51 +00:00
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spin_unlock(&ud->lock);
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2009-07-21 06:46:13 +00:00
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return happened;
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2008-07-09 20:56:51 +00:00
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}
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2009-07-21 06:46:13 +00:00
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EXPORT_SYMBOL_GPL(usbip_event_happened);
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