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430 lines
8.9 KiB
430 lines
8.9 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/string.h> |
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#include <linux/module.h> |
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#include <linux/device.h> |
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#include <linux/scatterlist.h> |
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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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#define DRIVER_DESC "USB/IP Host Driver" |
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struct kmem_cache *stub_priv_cache; |
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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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static struct bus_id_priv busid_table[MAX_BUSID]; |
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static DEFINE_SPINLOCK(busid_table_lock); |
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static void init_busid_table(void) |
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{ |
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int i; |
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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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memset(busid_table, 0, sizeof(busid_table)); |
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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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} |
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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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{ |
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int i; |
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int idx = -1; |
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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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if (busid_table[i].name[0]) |
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if (!strncmp(busid_table[i].name, busid, BUSID_SIZE)) { |
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idx = i; |
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spin_unlock(&busid_table[i].busid_lock); |
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break; |
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} |
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spin_unlock(&busid_table[i].busid_lock); |
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} |
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return idx; |
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} |
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/* Returns holding busid_lock. Should call put_busid_priv() to unlock */ |
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struct bus_id_priv *get_busid_priv(const char *busid) |
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{ |
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int idx; |
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struct bus_id_priv *bid = NULL; |
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spin_lock(&busid_table_lock); |
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idx = get_busid_idx(busid); |
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if (idx >= 0) { |
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bid = &(busid_table[idx]); |
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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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spin_unlock(&busid_table_lock); |
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return bid; |
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} |
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void put_busid_priv(struct bus_id_priv *bid) |
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{ |
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if (bid) |
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spin_unlock(&bid->busid_lock); |
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} |
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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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int ret = -1; |
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spin_lock(&busid_table_lock); |
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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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for (i = 0; i < MAX_BUSID; i++) { |
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spin_lock(&busid_table[i].busid_lock); |
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if (!busid_table[i].name[0]) { |
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strlcpy(busid_table[i].name, busid, BUSID_SIZE); |
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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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ret = 0; |
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spin_unlock(&busid_table[i].busid_lock); |
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break; |
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} |
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spin_unlock(&busid_table[i].busid_lock); |
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} |
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out: |
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spin_unlock(&busid_table_lock); |
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return ret; |
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} |
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int del_match_busid(char *busid) |
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{ |
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int idx; |
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int ret = -1; |
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spin_lock(&busid_table_lock); |
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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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spin_lock(&busid_table[idx].busid_lock); |
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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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spin_unlock(&busid_table[idx].busid_lock); |
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out: |
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spin_unlock(&busid_table_lock); |
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return ret; |
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} |
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static ssize_t match_busid_show(struct device_driver *drv, char *buf) |
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{ |
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int i; |
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char *out = buf; |
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spin_lock(&busid_table_lock); |
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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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if (busid_table[i].name[0]) |
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out += sprintf(out, "%s ", busid_table[i].name); |
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spin_unlock(&busid_table[i].busid_lock); |
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} |
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spin_unlock(&busid_table_lock); |
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out += sprintf(out, "\n"); |
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return out - buf; |
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} |
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static ssize_t match_busid_store(struct device_driver *dev, const char *buf, |
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size_t count) |
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{ |
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int len; |
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char busid[BUSID_SIZE]; |
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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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len = strlcpy(busid, buf + 4, BUSID_SIZE); |
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if (sizeof(busid) <= len) |
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return -EINVAL; |
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if (!strncmp(buf, "add ", 4)) { |
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if (add_match_busid(busid) < 0) |
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return -ENOMEM; |
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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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return -ENODEV; |
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pr_debug("del busid %s\n", busid); |
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return count; |
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} |
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return -EINVAL; |
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} |
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static DRIVER_ATTR_RW(match_busid); |
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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 = 0; |
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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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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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/* now run rebind - no need to hold locks. driver files are removed */ |
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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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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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/* mark the device for deletion so probe ignores it during rescan */ |
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bid->status = STUB_BUSID_OTHER; |
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/* release the busid lock */ |
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put_busid_priv(bid); |
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ret = do_rebind((char *) buf, bid); |
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if (ret < 0) |
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return ret; |
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/* delete device from busid_table */ |
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del_match_busid((char *) buf); |
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return count; |
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} |
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static DRIVER_ATTR_WO(rebind); |
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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_init(&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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void stub_free_priv_and_urb(struct stub_priv *priv) |
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{ |
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struct urb *urb; |
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int i; |
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for (i = 0; i < priv->num_urbs; i++) { |
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urb = priv->urbs[i]; |
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if (!urb) |
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return; |
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kfree(urb->setup_packet); |
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urb->setup_packet = NULL; |
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if (urb->transfer_buffer && !priv->sgl) { |
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kfree(urb->transfer_buffer); |
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urb->transfer_buffer = NULL; |
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} |
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if (urb->num_sgs) { |
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sgl_free(urb->sg); |
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urb->sg = NULL; |
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urb->num_sgs = 0; |
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} |
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usb_free_urb(urb); |
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} |
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if (!list_empty(&priv->list)) |
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list_del(&priv->list); |
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if (priv->sgl) |
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sgl_free(priv->sgl); |
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kfree(priv->urbs); |
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kmem_cache_free(stub_priv_cache, priv); |
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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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if (priv) |
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goto done; |
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priv = stub_priv_pop_from_listhead(&sdev->priv_tx); |
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if (priv) |
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goto done; |
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priv = stub_priv_pop_from_listhead(&sdev->priv_free); |
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done: |
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spin_unlock_irqrestore(&sdev->priv_lock, flags); |
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return priv; |
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} |
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void stub_device_cleanup_urbs(struct stub_device *sdev) |
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{ |
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struct stub_priv *priv; |
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int i; |
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dev_dbg(&sdev->udev->dev, "Stub device cleaning up urbs\n"); |
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while ((priv = stub_priv_pop(sdev))) { |
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for (i = 0; i < priv->num_urbs; i++) |
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usb_kill_urb(priv->urbs[i]); |
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stub_free_priv_and_urb(priv); |
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} |
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} |
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static int __init usbip_host_init(void) |
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{ |
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int ret; |
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init_busid_table(); |
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stub_priv_cache = KMEM_CACHE(stub_priv, SLAB_HWCACHE_ALIGN); |
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if (!stub_priv_cache) { |
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pr_err("kmem_cache_create failed\n"); |
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return -ENOMEM; |
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} |
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ret = usb_register_device_driver(&stub_driver, THIS_MODULE); |
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if (ret) { |
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pr_err("usb_register failed %d\n", ret); |
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goto err_usb_register; |
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} |
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ret = driver_create_file(&stub_driver.drvwrap.driver, |
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&driver_attr_match_busid); |
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if (ret) { |
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pr_err("driver_create_file failed\n"); |
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goto err_create_file; |
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} |
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ret = driver_create_file(&stub_driver.drvwrap.driver, |
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&driver_attr_rebind); |
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if (ret) { |
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pr_err("driver_create_file failed\n"); |
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goto err_create_file; |
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} |
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return ret; |
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err_create_file: |
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usb_deregister_device_driver(&stub_driver); |
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err_usb_register: |
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kmem_cache_destroy(stub_priv_cache); |
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return ret; |
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} |
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static void __exit usbip_host_exit(void) |
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{ |
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driver_remove_file(&stub_driver.drvwrap.driver, |
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&driver_attr_match_busid); |
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driver_remove_file(&stub_driver.drvwrap.driver, |
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&driver_attr_rebind); |
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/* |
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* deregister() calls stub_disconnect() for all devices. Device |
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* specific data is cleared in stub_disconnect(). |
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*/ |
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usb_deregister_device_driver(&stub_driver); |
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/* initiate scan to attach devices */ |
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stub_device_rebind(); |
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kmem_cache_destroy(stub_priv_cache); |
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} |
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module_init(usbip_host_init); |
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module_exit(usbip_host_exit); |
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MODULE_AUTHOR(DRIVER_AUTHOR); |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_LICENSE("GPL");
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