2 * Copyright (C) 2003-2008 Takahiro Hirofuchi
4 * This is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
20 #include "usbip_common.h"
21 #include <linux/kthread.h>
23 static int event_handler(struct usbip_device
*ud
)
25 usbip_dbg_eh("enter\n");
28 * Events are handled by only this thread.
30 while (usbip_event_happened(ud
)) {
31 usbip_dbg_eh("pending event %lx\n", ud
->event
);
34 * NOTE: shutdown must come first.
35 * Shutdown the device.
37 if (ud
->event
& USBIP_EH_SHUTDOWN
) {
38 ud
->eh_ops
.shutdown(ud
);
40 ud
->event
&= ~USBIP_EH_SHUTDOWN
;
43 /* Reset the device. */
44 if (ud
->event
& USBIP_EH_RESET
) {
47 ud
->event
&= ~USBIP_EH_RESET
;
50 /* Mark the device as unusable. */
51 if (ud
->event
& USBIP_EH_UNUSABLE
) {
52 ud
->eh_ops
.unusable(ud
);
54 ud
->event
&= ~USBIP_EH_UNUSABLE
;
57 /* Stop the error handler. */
58 if (ud
->event
& USBIP_EH_BYE
)
65 static void event_handler_loop(struct usbip_task
*ut
)
67 struct usbip_device
*ud
= container_of(ut
, struct usbip_device
, eh
);
70 if (signal_pending(current
)) {
71 usbip_dbg_eh("signal catched!\n");
75 if (event_handler(ud
) < 0)
78 wait_event_interruptible(ud
->eh_waitq
,
79 usbip_event_happened(ud
));
80 usbip_dbg_eh("wakeup\n");
84 int usbip_start_eh(struct usbip_device
*ud
)
86 struct usbip_task
*eh
= &ud
->eh
;
87 struct task_struct
*th
;
89 init_waitqueue_head(&ud
->eh_waitq
);
92 usbip_task_init(eh
, "usbip_eh", event_handler_loop
);
94 th
= kthread_run(usbip_thread
, (void *)eh
, "usbip");
97 "Unable to start control thread\n");
101 wait_for_completion(&eh
->thread_done
);
104 EXPORT_SYMBOL_GPL(usbip_start_eh
);
106 void usbip_stop_eh(struct usbip_device
*ud
)
108 struct usbip_task
*eh
= &ud
->eh
;
110 if (eh
->thread
== current
)
111 return; /* do not wait for myself */
113 wait_for_completion(&eh
->thread_done
);
114 usbip_dbg_eh("usbip_eh has finished\n");
116 EXPORT_SYMBOL_GPL(usbip_stop_eh
);
118 void usbip_event_add(struct usbip_device
*ud
, unsigned long event
)
120 spin_lock(&ud
->lock
);
124 wake_up(&ud
->eh_waitq
);
126 spin_unlock(&ud
->lock
);
128 EXPORT_SYMBOL_GPL(usbip_event_add
);
130 int usbip_event_happened(struct usbip_device
*ud
)
134 spin_lock(&ud
->lock
);
139 spin_unlock(&ud
->lock
);
143 EXPORT_SYMBOL_GPL(usbip_event_happened
);