2017-11-03 18:28:30 +08:00
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// SPDX-License-Identifier: GPL-2.0+
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2008-07-10 04:56:51 +08:00
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/*
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* Copyright (C) 2003-2008 Takahiro Hirofuchi
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*/
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2011-05-12 13:33:43 +08:00
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#include <linux/string.h>
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2011-07-04 03:49:50 +08:00
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#include <linux/module.h>
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2014-03-08 20:53:33 +08:00
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#include <linux/device.h>
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2008-07-10 04:56:51 +08:00
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#include "usbip_common.h"
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#include "stub.h"
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#define DRIVER_AUTHOR "Takahiro Hirofuchi"
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2011-05-12 13:33:44 +08:00
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#define DRIVER_DESC "USB/IP Host Driver"
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2008-07-10 04:56:51 +08:00
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struct kmem_cache *stub_priv_cache;
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2018-05-01 06:17:20 +08:00
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2008-07-10 04:56:51 +08:00
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/*
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* busid_tables defines matching busids that usbip can grab. A user can change
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* dynamically what device is locally used and what device is exported to a
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* remote host.
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*/
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#define MAX_BUSID 16
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2010-07-27 18:39:30 +08:00
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static struct bus_id_priv busid_table[MAX_BUSID];
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2008-07-10 04:56:51 +08:00
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static spinlock_t busid_table_lock;
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2011-05-20 12:36:57 +08:00
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static void init_busid_table(void)
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{
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2018-05-15 10:49:58 +08:00
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int i;
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2013-04-04 22:03:10 +08:00
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/*
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* This also sets the bus_table[i].status to
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* STUB_BUSID_OTHER, which is 0.
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*/
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2011-05-27 16:49:24 +08:00
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memset(busid_table, 0, sizeof(busid_table));
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2011-05-20 12:36:57 +08:00
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spin_lock_init(&busid_table_lock);
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2018-05-15 10:49:58 +08:00
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for (i = 0; i < MAX_BUSID; i++)
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spin_lock_init(&busid_table[i].busid_lock);
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2011-05-20 12:36:57 +08:00
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}
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2011-05-20 12:36:58 +08:00
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/*
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* Find the index of the busid by name.
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* Must be called with busid_table_lock held.
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*/
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static int get_busid_idx(const char *busid)
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2008-07-10 04:56:51 +08:00
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{
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int i;
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2011-05-20 12:36:58 +08:00
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int idx = -1;
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2008-07-10 04:56:51 +08:00
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2018-05-15 10:49:58 +08:00
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for (i = 0; i < MAX_BUSID; i++) {
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spin_lock(&busid_table[i].busid_lock);
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2010-07-27 18:39:30 +08:00
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if (busid_table[i].name[0])
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if (!strncmp(busid_table[i].name, busid, BUSID_SIZE)) {
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2011-05-20 12:36:58 +08:00
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idx = i;
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2018-05-15 10:49:58 +08:00
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spin_unlock(&busid_table[i].busid_lock);
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2011-05-20 12:36:58 +08:00
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break;
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2008-07-10 04:56:51 +08:00
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}
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2018-05-15 10:49:58 +08:00
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spin_unlock(&busid_table[i].busid_lock);
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}
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2011-05-20 12:36:58 +08:00
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return idx;
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2008-07-10 04:56:51 +08:00
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}
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2018-05-15 10:49:58 +08:00
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/* Returns holding busid_lock. Should call put_busid_priv() to unlock */
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2010-07-27 18:39:30 +08:00
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struct bus_id_priv *get_busid_priv(const char *busid)
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{
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2011-05-20 12:36:58 +08:00
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int idx;
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struct bus_id_priv *bid = NULL;
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2010-07-27 18:39:30 +08:00
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spin_lock(&busid_table_lock);
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2011-05-20 12:36:58 +08:00
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idx = get_busid_idx(busid);
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2018-05-15 10:49:58 +08:00
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if (idx >= 0) {
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2011-05-20 12:36:58 +08:00
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bid = &(busid_table[idx]);
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2018-05-15 10:49:58 +08:00
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/* get busid_lock before returning */
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spin_lock(&bid->busid_lock);
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}
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2010-07-27 18:39:30 +08:00
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spin_unlock(&busid_table_lock);
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2011-05-20 12:36:58 +08:00
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return bid;
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2010-07-27 18:39:30 +08:00
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}
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2018-05-15 10:49:58 +08:00
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void put_busid_priv(struct bus_id_priv *bid)
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{
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2018-05-16 07:57:23 +08:00
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if (bid)
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spin_unlock(&bid->busid_lock);
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2018-05-15 10:49:58 +08:00
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}
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2008-07-10 04:56:51 +08:00
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static int add_match_busid(char *busid)
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{
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int i;
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2011-05-20 12:36:58 +08:00
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int ret = -1;
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2008-07-10 04:56:51 +08:00
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spin_lock(&busid_table_lock);
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2011-05-20 12:36:58 +08:00
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/* already registered? */
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if (get_busid_idx(busid) >= 0) {
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ret = 0;
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goto out;
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}
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2018-05-15 10:49:58 +08:00
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for (i = 0; i < MAX_BUSID; i++) {
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spin_lock(&busid_table[i].busid_lock);
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2010-07-27 18:39:30 +08:00
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if (!busid_table[i].name[0]) {
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2014-07-26 22:43:20 +08:00
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strlcpy(busid_table[i].name, busid, BUSID_SIZE);
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2010-07-27 18:39:30 +08:00
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if ((busid_table[i].status != STUB_BUSID_ALLOC) &&
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(busid_table[i].status != STUB_BUSID_REMOV))
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busid_table[i].status = STUB_BUSID_ADDED;
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2011-05-20 12:36:58 +08:00
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ret = 0;
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2018-05-15 10:49:58 +08:00
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spin_unlock(&busid_table[i].busid_lock);
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2011-05-20 12:36:58 +08:00
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break;
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2008-07-10 04:56:51 +08:00
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}
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2018-05-15 10:49:58 +08:00
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spin_unlock(&busid_table[i].busid_lock);
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}
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2011-05-20 12:36:58 +08:00
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out:
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2008-07-10 04:56:51 +08:00
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spin_unlock(&busid_table_lock);
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2011-05-20 12:36:58 +08:00
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return ret;
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2008-07-10 04:56:51 +08:00
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}
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2010-07-27 18:39:30 +08:00
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int del_match_busid(char *busid)
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2008-07-10 04:56:51 +08:00
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{
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2011-05-20 12:36:58 +08:00
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int idx;
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int ret = -1;
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2008-07-10 04:56:51 +08:00
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spin_lock(&busid_table_lock);
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2011-05-20 12:36:58 +08:00
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idx = get_busid_idx(busid);
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if (idx < 0)
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goto out;
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/* found */
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ret = 0;
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2018-05-15 10:49:58 +08:00
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spin_lock(&busid_table[idx].busid_lock);
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2011-05-20 12:36:58 +08:00
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if (busid_table[idx].status == STUB_BUSID_OTHER)
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memset(busid_table[idx].name, 0, BUSID_SIZE);
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if ((busid_table[idx].status != STUB_BUSID_OTHER) &&
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(busid_table[idx].status != STUB_BUSID_ADDED))
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busid_table[idx].status = STUB_BUSID_REMOV;
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2018-05-15 10:49:58 +08:00
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spin_unlock(&busid_table[idx].busid_lock);
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2011-05-20 12:36:58 +08:00
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out:
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2008-07-10 04:56:51 +08:00
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spin_unlock(&busid_table_lock);
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2011-05-20 12:36:58 +08:00
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return ret;
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2008-07-10 04:56:51 +08:00
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}
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2011-05-06 18:47:42 +08:00
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2017-06-09 17:03:14 +08:00
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static ssize_t match_busid_show(struct device_driver *drv, char *buf)
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2010-07-27 18:39:30 +08:00
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{
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int i;
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2011-05-20 12:36:57 +08:00
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char *out = buf;
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2010-07-27 18:39:30 +08:00
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2011-05-20 12:36:57 +08:00
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spin_lock(&busid_table_lock);
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2018-05-15 10:49:58 +08:00
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for (i = 0; i < MAX_BUSID; i++) {
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spin_lock(&busid_table[i].busid_lock);
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2011-05-20 12:36:57 +08:00
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if (busid_table[i].name[0])
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out += sprintf(out, "%s ", busid_table[i].name);
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2018-05-15 10:49:58 +08:00
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spin_unlock(&busid_table[i].busid_lock);
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}
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2011-05-20 12:36:57 +08:00
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spin_unlock(&busid_table_lock);
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out += sprintf(out, "\n");
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2011-05-20 12:36:58 +08:00
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2011-05-20 12:36:57 +08:00
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return out - buf;
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2010-07-27 18:39:30 +08:00
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}
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2008-07-10 04:56:51 +08:00
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2017-06-09 17:03:14 +08:00
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static ssize_t match_busid_store(struct device_driver *dev, const char *buf,
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2011-05-06 18:47:42 +08:00
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size_t count)
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2008-07-10 04:56:51 +08:00
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{
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int len;
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2008-10-30 08:59:32 +08:00
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char busid[BUSID_SIZE];
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2008-07-10 04:56:51 +08:00
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if (count < 5)
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return -EINVAL;
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/* busid needs to include \0 termination */
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2014-07-26 22:43:20 +08:00
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len = strlcpy(busid, buf + 4, BUSID_SIZE);
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if (sizeof(busid) <= len)
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2008-07-10 04:56:51 +08:00
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return -EINVAL;
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if (!strncmp(buf, "add ", 4)) {
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2013-04-04 22:03:09 +08:00
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if (add_match_busid(busid) < 0)
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2008-07-10 04:56:51 +08:00
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return -ENOMEM;
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2013-04-04 22:03:09 +08:00
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pr_debug("add busid %s\n", busid);
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return count;
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}
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if (!strncmp(buf, "del ", 4)) {
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if (del_match_busid(busid) < 0)
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2008-07-10 04:56:51 +08:00
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return -ENODEV;
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2013-04-04 22:03:09 +08:00
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pr_debug("del busid %s\n", busid);
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return count;
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2011-05-20 12:36:58 +08:00
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}
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2013-04-04 22:03:09 +08:00
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return -EINVAL;
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2008-07-10 04:56:51 +08:00
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}
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2017-06-09 17:03:14 +08:00
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static DRIVER_ATTR_RW(match_busid);
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2008-07-10 04:56:51 +08:00
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2018-05-01 06:17:20 +08:00
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static int do_rebind(char *busid, struct bus_id_priv *busid_priv)
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{
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int ret;
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/* device_attach() callers should hold parent lock for USB */
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if (busid_priv->udev->dev.parent)
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device_lock(busid_priv->udev->dev.parent);
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ret = device_attach(&busid_priv->udev->dev);
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if (busid_priv->udev->dev.parent)
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device_unlock(busid_priv->udev->dev.parent);
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if (ret < 0) {
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dev_err(&busid_priv->udev->dev, "rebind failed\n");
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return ret;
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}
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return 0;
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}
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static void stub_device_rebind(void)
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{
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#if IS_MODULE(CONFIG_USBIP_HOST)
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struct bus_id_priv *busid_priv;
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int i;
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/* update status to STUB_BUSID_OTHER so probe ignores the device */
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spin_lock(&busid_table_lock);
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for (i = 0; i < MAX_BUSID; i++) {
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if (busid_table[i].name[0] &&
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busid_table[i].shutdown_busid) {
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busid_priv = &(busid_table[i]);
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busid_priv->status = STUB_BUSID_OTHER;
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}
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}
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spin_unlock(&busid_table_lock);
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2018-05-15 10:49:58 +08:00
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/* now run rebind - no need to hold locks. driver files are removed */
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2018-05-01 06:17:20 +08:00
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for (i = 0; i < MAX_BUSID; i++) {
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if (busid_table[i].name[0] &&
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busid_table[i].shutdown_busid) {
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busid_priv = &(busid_table[i]);
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do_rebind(busid_table[i].name, busid_priv);
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}
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}
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#endif
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}
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2014-03-08 20:53:33 +08:00
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static ssize_t rebind_store(struct device_driver *dev, const char *buf,
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size_t count)
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{
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int ret;
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int len;
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struct bus_id_priv *bid;
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/* buf length should be less that BUSID_SIZE */
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len = strnlen(buf, BUSID_SIZE);
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if (!(len < BUSID_SIZE))
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return -EINVAL;
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bid = get_busid_priv(buf);
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if (!bid)
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return -ENODEV;
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2018-05-01 06:17:19 +08:00
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/* mark the device for deletion so probe ignores it during rescan */
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bid->status = STUB_BUSID_OTHER;
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2018-05-15 10:49:58 +08:00
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/* release the busid lock */
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put_busid_priv(bid);
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2018-05-01 06:17:19 +08:00
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2018-05-01 06:17:20 +08:00
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ret = do_rebind((char *) buf, bid);
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if (ret < 0)
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2014-03-08 20:53:33 +08:00
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return ret;
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2018-05-01 06:17:19 +08:00
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/* delete device from busid_table */
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del_match_busid((char *) buf);
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2014-03-08 20:53:33 +08:00
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return count;
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}
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static DRIVER_ATTR_WO(rebind);
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2008-07-10 04:56:51 +08:00
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static struct stub_priv *stub_priv_pop_from_listhead(struct list_head *listhead)
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{
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struct stub_priv *priv, *tmp;
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list_for_each_entry_safe(priv, tmp, listhead, list) {
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list_del(&priv->list);
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return priv;
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}
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return NULL;
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}
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static struct stub_priv *stub_priv_pop(struct stub_device *sdev)
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{
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unsigned long flags;
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struct stub_priv *priv;
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spin_lock_irqsave(&sdev->priv_lock, flags);
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priv = stub_priv_pop_from_listhead(&sdev->priv_init);
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2011-05-20 12:36:58 +08:00
|
|
|
if (priv)
|
|
|
|
goto done;
|
2008-07-10 04:56:51 +08:00
|
|
|
|
|
|
|
priv = stub_priv_pop_from_listhead(&sdev->priv_tx);
|
2011-05-20 12:36:58 +08:00
|
|
|
if (priv)
|
|
|
|
goto done;
|
2008-07-10 04:56:51 +08:00
|
|
|
|
|
|
|
priv = stub_priv_pop_from_listhead(&sdev->priv_free);
|
|
|
|
|
2011-05-20 12:36:58 +08:00
|
|
|
done:
|
2008-07-10 04:56:51 +08:00
|
|
|
spin_unlock_irqrestore(&sdev->priv_lock, flags);
|
2011-05-20 12:36:58 +08:00
|
|
|
|
|
|
|
return priv;
|
2008-07-10 04:56:51 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
void stub_device_cleanup_urbs(struct stub_device *sdev)
|
|
|
|
{
|
|
|
|
struct stub_priv *priv;
|
2011-05-20 12:36:58 +08:00
|
|
|
struct urb *urb;
|
2008-07-10 04:56:51 +08:00
|
|
|
|
2017-12-19 08:23:37 +08:00
|
|
|
dev_dbg(&sdev->udev->dev, "Stub device cleaning up urbs\n");
|
2008-07-10 04:56:51 +08:00
|
|
|
|
|
|
|
while ((priv = stub_priv_pop(sdev))) {
|
2011-05-20 12:36:58 +08:00
|
|
|
urb = priv->urb;
|
2017-12-19 08:23:37 +08:00
|
|
|
dev_dbg(&sdev->udev->dev, "free urb seqnum %lu\n",
|
|
|
|
priv->seqnum);
|
2008-07-10 04:56:51 +08:00
|
|
|
usb_kill_urb(urb);
|
|
|
|
|
|
|
|
kmem_cache_free(stub_priv_cache, priv);
|
|
|
|
|
2011-03-13 13:29:12 +08:00
|
|
|
kfree(urb->transfer_buffer);
|
2017-05-22 19:02:44 +08:00
|
|
|
urb->transfer_buffer = NULL;
|
|
|
|
|
2011-03-13 13:29:12 +08:00
|
|
|
kfree(urb->setup_packet);
|
2017-05-22 19:02:44 +08:00
|
|
|
urb->setup_packet = NULL;
|
|
|
|
|
2008-07-10 04:56:51 +08:00
|
|
|
usb_free_urb(urb);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-05-20 12:36:59 +08:00
|
|
|
static int __init usbip_host_init(void)
|
2008-07-10 04:56:51 +08:00
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
2012-01-26 02:46:32 +08:00
|
|
|
init_busid_table();
|
2011-05-20 12:37:00 +08:00
|
|
|
|
2012-01-26 02:46:32 +08:00
|
|
|
stub_priv_cache = KMEM_CACHE(stub_priv, SLAB_HWCACHE_ALIGN);
|
2008-07-10 04:56:51 +08:00
|
|
|
if (!stub_priv_cache) {
|
2011-05-20 12:36:58 +08:00
|
|
|
pr_err("kmem_cache_create failed\n");
|
2008-07-10 04:56:51 +08:00
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
2014-01-24 05:12:29 +08:00
|
|
|
ret = usb_register_device_driver(&stub_driver, THIS_MODULE);
|
2013-09-10 13:14:07 +08:00
|
|
|
if (ret) {
|
2011-05-20 07:47:32 +08:00
|
|
|
pr_err("usb_register failed %d\n", ret);
|
2011-05-20 12:36:58 +08:00
|
|
|
goto err_usb_register;
|
2008-07-10 04:56:51 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
ret = driver_create_file(&stub_driver.drvwrap.driver,
|
|
|
|
&driver_attr_match_busid);
|
2013-09-10 13:14:07 +08:00
|
|
|
if (ret) {
|
2011-05-20 12:36:58 +08:00
|
|
|
pr_err("driver_create_file failed\n");
|
|
|
|
goto err_create_file;
|
2008-07-10 04:56:51 +08:00
|
|
|
}
|
|
|
|
|
2014-03-08 20:53:33 +08:00
|
|
|
ret = driver_create_file(&stub_driver.drvwrap.driver,
|
|
|
|
&driver_attr_rebind);
|
|
|
|
if (ret) {
|
|
|
|
pr_err("driver_create_file failed\n");
|
|
|
|
goto err_create_file;
|
|
|
|
}
|
|
|
|
|
2008-07-10 04:56:51 +08:00
|
|
|
return ret;
|
2011-05-20 12:36:58 +08:00
|
|
|
|
|
|
|
err_create_file:
|
2014-01-24 05:12:29 +08:00
|
|
|
usb_deregister_device_driver(&stub_driver);
|
2011-05-20 12:36:58 +08:00
|
|
|
err_usb_register:
|
2008-07-10 04:56:51 +08:00
|
|
|
kmem_cache_destroy(stub_priv_cache);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2011-05-20 12:36:59 +08:00
|
|
|
static void __exit usbip_host_exit(void)
|
2008-07-10 04:56:51 +08:00
|
|
|
{
|
|
|
|
driver_remove_file(&stub_driver.drvwrap.driver,
|
|
|
|
&driver_attr_match_busid);
|
|
|
|
|
2014-03-08 20:53:33 +08:00
|
|
|
driver_remove_file(&stub_driver.drvwrap.driver,
|
|
|
|
&driver_attr_rebind);
|
|
|
|
|
2008-07-10 04:56:51 +08:00
|
|
|
/*
|
|
|
|
* deregister() calls stub_disconnect() for all devices. Device
|
|
|
|
* specific data is cleared in stub_disconnect().
|
|
|
|
*/
|
2014-01-24 05:12:29 +08:00
|
|
|
usb_deregister_device_driver(&stub_driver);
|
2008-07-10 04:56:51 +08:00
|
|
|
|
2018-05-01 06:17:20 +08:00
|
|
|
/* initiate scan to attach devices */
|
|
|
|
stub_device_rebind();
|
|
|
|
|
2008-07-10 04:56:51 +08:00
|
|
|
kmem_cache_destroy(stub_priv_cache);
|
|
|
|
}
|
|
|
|
|
2011-05-20 12:36:59 +08:00
|
|
|
module_init(usbip_host_init);
|
|
|
|
module_exit(usbip_host_exit);
|
2008-07-10 04:56:51 +08:00
|
|
|
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
|
|
MODULE_LICENSE("GPL");
|