remarkable-linux/drivers/staging/usbip/usbip_common.c
Arnd Bergmann 9720b4bc76 staging/usbip: convert to kthread
usbip has its own infrastructure for managing kernel
threads, similar to kthread. By changing it to use
the standard functions, we can simplify the code
and get rid of one of the last BKL users at the
same time.

Includes changes suggested by Max Vozeler.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>
Cc: Max Vozeler <max@vozeler.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-03-02 16:03:59 -05:00

837 lines
20 KiB
C

/*
* Copyright (C) 2003-2008 Takahiro Hirofuchi
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <linux/kernel.h>
#include <linux/file.h>
#include <linux/tcp.h>
#include <linux/in.h>
#include <linux/kthread.h>
#include <linux/slab.h>
#include "usbip_common.h"
/* version information */
#define DRIVER_VERSION "1.0"
#define DRIVER_AUTHOR "Takahiro Hirofuchi <hirofuchi _at_ users.sourceforge.net>"
#define DRIVER_DESC "usbip common driver"
/*-------------------------------------------------------------------------*/
/* debug routines */
#ifdef CONFIG_USB_IP_DEBUG_ENABLE
unsigned long usbip_debug_flag = 0xffffffff;
#else
unsigned long usbip_debug_flag;
#endif
EXPORT_SYMBOL_GPL(usbip_debug_flag);
/* FIXME */
struct device_attribute dev_attr_usbip_debug;
EXPORT_SYMBOL_GPL(dev_attr_usbip_debug);
static ssize_t show_flag(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%lx\n", usbip_debug_flag);
}
static ssize_t store_flag(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
sscanf(buf, "%lx", &usbip_debug_flag);
return count;
}
DEVICE_ATTR(usbip_debug, (S_IRUGO | S_IWUSR), show_flag, store_flag);
static void usbip_dump_buffer(char *buff, int bufflen)
{
print_hex_dump(KERN_DEBUG, "usb-ip", DUMP_PREFIX_OFFSET, 16, 4,
buff, bufflen, false);
}
static void usbip_dump_pipe(unsigned int p)
{
unsigned char type = usb_pipetype(p);
unsigned char ep = usb_pipeendpoint(p);
unsigned char dev = usb_pipedevice(p);
unsigned char dir = usb_pipein(p);
printk(KERN_DEBUG "dev(%d) ", dev);
printk(KERN_DEBUG "ep(%d) ", ep);
printk(KERN_DEBUG "%s ", dir ? "IN" : "OUT");
switch (type) {
case PIPE_ISOCHRONOUS:
printk(KERN_DEBUG "%s ", "ISO");
break;
case PIPE_INTERRUPT:
printk(KERN_DEBUG "%s ", "INT");
break;
case PIPE_CONTROL:
printk(KERN_DEBUG "%s ", "CTL");
break;
case PIPE_BULK:
printk(KERN_DEBUG "%s ", "BLK");
break;
default:
printk(KERN_DEBUG "ERR");
}
printk(KERN_DEBUG "\n");
}
static void usbip_dump_usb_device(struct usb_device *udev)
{
struct device *dev = &udev->dev;
int i;
dev_dbg(dev, " devnum(%d) devpath(%s)",
udev->devnum, udev->devpath);
switch (udev->speed) {
case USB_SPEED_HIGH:
printk(KERN_DEBUG " SPD_HIGH");
break;
case USB_SPEED_FULL:
printk(KERN_DEBUG " SPD_FULL");
break;
case USB_SPEED_LOW:
printk(KERN_DEBUG " SPD_LOW");
break;
case USB_SPEED_UNKNOWN:
printk(KERN_DEBUG " SPD_UNKNOWN");
break;
default:
printk(KERN_DEBUG " SPD_ERROR");
}
printk(KERN_DEBUG " tt %p, ttport %d", udev->tt, udev->ttport);
printk(KERN_DEBUG "\n");
dev_dbg(dev, " ");
for (i = 0; i < 16; i++)
printk(KERN_DEBUG " %2u", i);
printk(KERN_DEBUG "\n");
dev_dbg(dev, " toggle0(IN) :");
for (i = 0; i < 16; i++)
printk(KERN_DEBUG " %2u", (udev->toggle[0] & (1 << i)) ? 1 : 0);
printk(KERN_DEBUG "\n");
dev_dbg(dev, " toggle1(OUT):");
for (i = 0; i < 16; i++)
printk(KERN_DEBUG " %2u", (udev->toggle[1] & (1 << i)) ? 1 : 0);
printk(KERN_DEBUG "\n");
dev_dbg(dev, " epmaxp_in :");
for (i = 0; i < 16; i++) {
if (udev->ep_in[i])
printk(KERN_DEBUG " %2u",
le16_to_cpu(udev->ep_in[i]->desc.wMaxPacketSize));
}
printk(KERN_DEBUG "\n");
dev_dbg(dev, " epmaxp_out :");
for (i = 0; i < 16; i++) {
if (udev->ep_out[i])
printk(KERN_DEBUG " %2u",
le16_to_cpu(udev->ep_out[i]->desc.wMaxPacketSize));
}
printk(KERN_DEBUG "\n");
dev_dbg(dev, "parent %p, bus %p\n", udev->parent, udev->bus);
dev_dbg(dev, "descriptor %p, config %p, actconfig %p, "
"rawdescriptors %p\n", &udev->descriptor, udev->config,
udev->actconfig, udev->rawdescriptors);
dev_dbg(dev, "have_langid %d, string_langid %d\n",
udev->have_langid, udev->string_langid);
dev_dbg(dev, "maxchild %d, children %p\n",
udev->maxchild, udev->children);
}
static void usbip_dump_request_type(__u8 rt)
{
switch (rt & USB_RECIP_MASK) {
case USB_RECIP_DEVICE:
printk(KERN_DEBUG "DEVICE");
break;
case USB_RECIP_INTERFACE:
printk(KERN_DEBUG "INTERF");
break;
case USB_RECIP_ENDPOINT:
printk(KERN_DEBUG "ENDPOI");
break;
case USB_RECIP_OTHER:
printk(KERN_DEBUG "OTHER ");
break;
default:
printk(KERN_DEBUG "------");
}
}
static void usbip_dump_usb_ctrlrequest(struct usb_ctrlrequest *cmd)
{
if (!cmd) {
printk(KERN_DEBUG " %s : null pointer\n", __func__);
return;
}
printk(KERN_DEBUG " ");
printk(KERN_DEBUG "bRequestType(%02X) ", cmd->bRequestType);
printk(KERN_DEBUG "bRequest(%02X) " , cmd->bRequest);
printk(KERN_DEBUG "wValue(%04X) ", cmd->wValue);
printk(KERN_DEBUG "wIndex(%04X) ", cmd->wIndex);
printk(KERN_DEBUG "wLength(%04X) ", cmd->wLength);
printk(KERN_DEBUG "\n ");
if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
printk(KERN_DEBUG "STANDARD ");
switch (cmd->bRequest) {
case USB_REQ_GET_STATUS:
printk(KERN_DEBUG "GET_STATUS");
break;
case USB_REQ_CLEAR_FEATURE:
printk(KERN_DEBUG "CLEAR_FEAT");
break;
case USB_REQ_SET_FEATURE:
printk(KERN_DEBUG "SET_FEAT ");
break;
case USB_REQ_SET_ADDRESS:
printk(KERN_DEBUG "SET_ADDRRS");
break;
case USB_REQ_GET_DESCRIPTOR:
printk(KERN_DEBUG "GET_DESCRI");
break;
case USB_REQ_SET_DESCRIPTOR:
printk(KERN_DEBUG "SET_DESCRI");
break;
case USB_REQ_GET_CONFIGURATION:
printk(KERN_DEBUG "GET_CONFIG");
break;
case USB_REQ_SET_CONFIGURATION:
printk(KERN_DEBUG "SET_CONFIG");
break;
case USB_REQ_GET_INTERFACE:
printk(KERN_DEBUG "GET_INTERF");
break;
case USB_REQ_SET_INTERFACE:
printk(KERN_DEBUG "SET_INTERF");
break;
case USB_REQ_SYNCH_FRAME:
printk(KERN_DEBUG "SYNC_FRAME");
break;
default:
printk(KERN_DEBUG "REQ(%02X) ", cmd->bRequest);
}
printk(KERN_DEBUG " ");
usbip_dump_request_type(cmd->bRequestType);
} else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_CLASS)
printk(KERN_DEBUG "CLASS ");
else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_VENDOR)
printk(KERN_DEBUG "VENDOR ");
else if ((cmd->bRequestType & USB_TYPE_MASK) == USB_TYPE_RESERVED)
printk(KERN_DEBUG "RESERVED");
printk(KERN_DEBUG "\n");
}
void usbip_dump_urb(struct urb *urb)
{
struct device *dev;
if (!urb) {
printk(KERN_DEBUG KBUILD_MODNAME
":%s: urb: null pointer!!\n", __func__);
return;
}
if (!urb->dev) {
printk(KERN_DEBUG KBUILD_MODNAME
":%s: urb->dev: null pointer!!\n", __func__);
return;
}
dev = &urb->dev->dev;
dev_dbg(dev, " urb :%p\n", urb);
dev_dbg(dev, " dev :%p\n", urb->dev);
usbip_dump_usb_device(urb->dev);
dev_dbg(dev, " pipe :%08x ", urb->pipe);
usbip_dump_pipe(urb->pipe);
dev_dbg(dev, " status :%d\n", urb->status);
dev_dbg(dev, " transfer_flags :%08X\n", urb->transfer_flags);
dev_dbg(dev, " transfer_buffer :%p\n", urb->transfer_buffer);
dev_dbg(dev, " transfer_buffer_length:%d\n",
urb->transfer_buffer_length);
dev_dbg(dev, " actual_length :%d\n", urb->actual_length);
dev_dbg(dev, " setup_packet :%p\n", urb->setup_packet);
if (urb->setup_packet && usb_pipetype(urb->pipe) == PIPE_CONTROL)
usbip_dump_usb_ctrlrequest(
(struct usb_ctrlrequest *)urb->setup_packet);
dev_dbg(dev, " start_frame :%d\n", urb->start_frame);
dev_dbg(dev, " number_of_packets :%d\n", urb->number_of_packets);
dev_dbg(dev, " interval :%d\n", urb->interval);
dev_dbg(dev, " error_count :%d\n", urb->error_count);
dev_dbg(dev, " context :%p\n", urb->context);
dev_dbg(dev, " complete :%p\n", urb->complete);
}
EXPORT_SYMBOL_GPL(usbip_dump_urb);
void usbip_dump_header(struct usbip_header *pdu)
{
usbip_udbg("BASE: cmd %u seq %u devid %u dir %u ep %u\n",
pdu->base.command,
pdu->base.seqnum,
pdu->base.devid,
pdu->base.direction,
pdu->base.ep);
switch (pdu->base.command) {
case USBIP_CMD_SUBMIT:
usbip_udbg("CMD_SUBMIT: "
"x_flags %u x_len %u sf %u #p %u iv %u\n",
pdu->u.cmd_submit.transfer_flags,
pdu->u.cmd_submit.transfer_buffer_length,
pdu->u.cmd_submit.start_frame,
pdu->u.cmd_submit.number_of_packets,
pdu->u.cmd_submit.interval);
break;
case USBIP_CMD_UNLINK:
usbip_udbg("CMD_UNLINK: seq %u\n", pdu->u.cmd_unlink.seqnum);
break;
case USBIP_RET_SUBMIT:
usbip_udbg("RET_SUBMIT: st %d al %u sf %d ec %d\n",
pdu->u.ret_submit.status,
pdu->u.ret_submit.actual_length,
pdu->u.ret_submit.start_frame,
pdu->u.ret_submit.error_count);
case USBIP_RET_UNLINK:
usbip_udbg("RET_UNLINK: status %d\n", pdu->u.ret_unlink.status);
break;
default:
/* NOT REACHED */
usbip_udbg("UNKNOWN\n");
}
}
EXPORT_SYMBOL_GPL(usbip_dump_header);
/*-------------------------------------------------------------------------*/
/* socket routines */
/* Send/receive messages over TCP/IP. I refer drivers/block/nbd.c */
int usbip_xmit(int send, struct socket *sock, char *buf,
int size, int msg_flags)
{
int result;
struct msghdr msg;
struct kvec iov;
int total = 0;
/* for blocks of if (usbip_dbg_flag_xmit) */
char *bp = buf;
int osize = size;
usbip_dbg_xmit("enter\n");
if (!sock || !buf || !size) {
printk(KERN_ERR "%s: invalid arg, sock %p buff %p size %d\n",
__func__, sock, buf, size);
return -EINVAL;
}
if (usbip_dbg_flag_xmit) {
if (send) {
if (!in_interrupt())
printk(KERN_DEBUG "%-10s:", current->comm);
else
printk(KERN_DEBUG "interrupt :");
printk(KERN_DEBUG "%s: sending... , sock %p, buf %p, "
"size %d, msg_flags %d\n", __func__,
sock, buf, size, msg_flags);
usbip_dump_buffer(buf, size);
}
}
do {
sock->sk->sk_allocation = GFP_NOIO;
iov.iov_base = buf;
iov.iov_len = size;
msg.msg_name = NULL;
msg.msg_namelen = 0;
msg.msg_control = NULL;
msg.msg_controllen = 0;
msg.msg_namelen = 0;
msg.msg_flags = msg_flags | MSG_NOSIGNAL;
if (send)
result = kernel_sendmsg(sock, &msg, &iov, 1, size);
else
result = kernel_recvmsg(sock, &msg, &iov, 1, size,
MSG_WAITALL);
if (result <= 0) {
usbip_udbg("usbip_xmit: %s sock %p buf %p size %u ret "
"%d total %d\n",
send ? "send" : "receive", sock, buf,
size, result, total);
goto err;
}
size -= result;
buf += result;
total += result;
} while (size > 0);
if (usbip_dbg_flag_xmit) {
if (!send) {
if (!in_interrupt())
printk(KERN_DEBUG "%-10s:", current->comm);
else
printk(KERN_DEBUG "interrupt :");
printk(KERN_DEBUG "usbip_xmit: receiving....\n");
usbip_dump_buffer(bp, osize);
printk(KERN_DEBUG "usbip_xmit: received, osize %d ret "
"%d size %d total %d\n", osize, result,
size, total);
}
if (send)
printk(KERN_DEBUG "usbip_xmit: send, total %d\n",
total);
}
return total;
err:
return result;
}
EXPORT_SYMBOL_GPL(usbip_xmit);
struct socket *sockfd_to_socket(unsigned int sockfd)
{
struct socket *socket;
struct file *file;
struct inode *inode;
file = fget(sockfd);
if (!file) {
printk(KERN_ERR "%s: invalid sockfd\n", __func__);
return NULL;
}
inode = file->f_dentry->d_inode;
if (!inode || !S_ISSOCK(inode->i_mode))
return NULL;
socket = SOCKET_I(inode);
return socket;
}
EXPORT_SYMBOL_GPL(sockfd_to_socket);
/*-------------------------------------------------------------------------*/
/* pdu routines */
/* there may be more cases to tweak the flags. */
static unsigned int tweak_transfer_flags(unsigned int flags)
{
flags &= ~URB_NO_TRANSFER_DMA_MAP;
return flags;
}
static void usbip_pack_cmd_submit(struct usbip_header *pdu, struct urb *urb,
int pack)
{
struct usbip_header_cmd_submit *spdu = &pdu->u.cmd_submit;
/*
* Some members are not still implemented in usbip. I hope this issue
* will be discussed when usbip is ported to other operating systems.
*/
if (pack) {
/* vhci_tx.c */
spdu->transfer_flags =
tweak_transfer_flags(urb->transfer_flags);
spdu->transfer_buffer_length = urb->transfer_buffer_length;
spdu->start_frame = urb->start_frame;
spdu->number_of_packets = urb->number_of_packets;
spdu->interval = urb->interval;
} else {
/* stub_rx.c */
urb->transfer_flags = spdu->transfer_flags;
urb->transfer_buffer_length = spdu->transfer_buffer_length;
urb->start_frame = spdu->start_frame;
urb->number_of_packets = spdu->number_of_packets;
urb->interval = spdu->interval;
}
}
static void usbip_pack_ret_submit(struct usbip_header *pdu, struct urb *urb,
int pack)
{
struct usbip_header_ret_submit *rpdu = &pdu->u.ret_submit;
if (pack) {
/* stub_tx.c */
rpdu->status = urb->status;
rpdu->actual_length = urb->actual_length;
rpdu->start_frame = urb->start_frame;
rpdu->error_count = urb->error_count;
} else {
/* vhci_rx.c */
urb->status = rpdu->status;
urb->actual_length = rpdu->actual_length;
urb->start_frame = rpdu->start_frame;
urb->error_count = rpdu->error_count;
}
}
void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
int pack)
{
switch (cmd) {
case USBIP_CMD_SUBMIT:
usbip_pack_cmd_submit(pdu, urb, pack);
break;
case USBIP_RET_SUBMIT:
usbip_pack_ret_submit(pdu, urb, pack);
break;
default:
err("unknown command");
/* NOTREACHED */
/* BUG(); */
}
}
EXPORT_SYMBOL_GPL(usbip_pack_pdu);
static void correct_endian_basic(struct usbip_header_basic *base, int send)
{
if (send) {
base->command = cpu_to_be32(base->command);
base->seqnum = cpu_to_be32(base->seqnum);
base->devid = cpu_to_be32(base->devid);
base->direction = cpu_to_be32(base->direction);
base->ep = cpu_to_be32(base->ep);
} else {
base->command = be32_to_cpu(base->command);
base->seqnum = be32_to_cpu(base->seqnum);
base->devid = be32_to_cpu(base->devid);
base->direction = be32_to_cpu(base->direction);
base->ep = be32_to_cpu(base->ep);
}
}
static void correct_endian_cmd_submit(struct usbip_header_cmd_submit *pdu,
int send)
{
if (send) {
pdu->transfer_flags = cpu_to_be32(pdu->transfer_flags);
cpu_to_be32s(&pdu->transfer_buffer_length);
cpu_to_be32s(&pdu->start_frame);
cpu_to_be32s(&pdu->number_of_packets);
cpu_to_be32s(&pdu->interval);
} else {
pdu->transfer_flags = be32_to_cpu(pdu->transfer_flags);
be32_to_cpus(&pdu->transfer_buffer_length);
be32_to_cpus(&pdu->start_frame);
be32_to_cpus(&pdu->number_of_packets);
be32_to_cpus(&pdu->interval);
}
}
static void correct_endian_ret_submit(struct usbip_header_ret_submit *pdu,
int send)
{
if (send) {
cpu_to_be32s(&pdu->status);
cpu_to_be32s(&pdu->actual_length);
cpu_to_be32s(&pdu->start_frame);
cpu_to_be32s(&pdu->error_count);
} else {
be32_to_cpus(&pdu->status);
be32_to_cpus(&pdu->actual_length);
be32_to_cpus(&pdu->start_frame);
be32_to_cpus(&pdu->error_count);
}
}
static void correct_endian_cmd_unlink(struct usbip_header_cmd_unlink *pdu,
int send)
{
if (send)
pdu->seqnum = cpu_to_be32(pdu->seqnum);
else
pdu->seqnum = be32_to_cpu(pdu->seqnum);
}
static void correct_endian_ret_unlink(struct usbip_header_ret_unlink *pdu,
int send)
{
if (send)
cpu_to_be32s(&pdu->status);
else
be32_to_cpus(&pdu->status);
}
void usbip_header_correct_endian(struct usbip_header *pdu, int send)
{
__u32 cmd = 0;
if (send)
cmd = pdu->base.command;
correct_endian_basic(&pdu->base, send);
if (!send)
cmd = pdu->base.command;
switch (cmd) {
case USBIP_CMD_SUBMIT:
correct_endian_cmd_submit(&pdu->u.cmd_submit, send);
break;
case USBIP_RET_SUBMIT:
correct_endian_ret_submit(&pdu->u.ret_submit, send);
break;
case USBIP_CMD_UNLINK:
correct_endian_cmd_unlink(&pdu->u.cmd_unlink, send);
break;
case USBIP_RET_UNLINK:
correct_endian_ret_unlink(&pdu->u.ret_unlink, send);
break;
default:
/* NOTREACHED */
err("unknown command in pdu header: %d", cmd);
/* BUG(); */
}
}
EXPORT_SYMBOL_GPL(usbip_header_correct_endian);
static void usbip_iso_pakcet_correct_endian(
struct usbip_iso_packet_descriptor *iso,
int send)
{
/* does not need all members. but copy all simply. */
if (send) {
iso->offset = cpu_to_be32(iso->offset);
iso->length = cpu_to_be32(iso->length);
iso->status = cpu_to_be32(iso->status);
iso->actual_length = cpu_to_be32(iso->actual_length);
} else {
iso->offset = be32_to_cpu(iso->offset);
iso->length = be32_to_cpu(iso->length);
iso->status = be32_to_cpu(iso->status);
iso->actual_length = be32_to_cpu(iso->actual_length);
}
}
static void usbip_pack_iso(struct usbip_iso_packet_descriptor *iso,
struct usb_iso_packet_descriptor *uiso, int pack)
{
if (pack) {
iso->offset = uiso->offset;
iso->length = uiso->length;
iso->status = uiso->status;
iso->actual_length = uiso->actual_length;
} else {
uiso->offset = iso->offset;
uiso->length = iso->length;
uiso->status = iso->status;
uiso->actual_length = iso->actual_length;
}
}
/* must free buffer */
void *usbip_alloc_iso_desc_pdu(struct urb *urb, ssize_t *bufflen)
{
void *buff;
struct usbip_iso_packet_descriptor *iso;
int np = urb->number_of_packets;
ssize_t size = np * sizeof(*iso);
int i;
buff = kzalloc(size, GFP_KERNEL);
if (!buff)
return NULL;
for (i = 0; i < np; i++) {
iso = buff + (i * sizeof(*iso));
usbip_pack_iso(iso, &urb->iso_frame_desc[i], 1);
usbip_iso_pakcet_correct_endian(iso, 1);
}
*bufflen = size;
return buff;
}
EXPORT_SYMBOL_GPL(usbip_alloc_iso_desc_pdu);
/* some members of urb must be substituted before. */
int usbip_recv_iso(struct usbip_device *ud, struct urb *urb)
{
void *buff;
struct usbip_iso_packet_descriptor *iso;
int np = urb->number_of_packets;
int size = np * sizeof(*iso);
int i;
int ret;
if (!usb_pipeisoc(urb->pipe))
return 0;
/* my Bluetooth dongle gets ISO URBs which are np = 0 */
if (np == 0) {
/* usbip_uinfo("iso np == 0\n"); */
/* usbip_dump_urb(urb); */
return 0;
}
buff = kzalloc(size, GFP_KERNEL);
if (!buff)
return -ENOMEM;
ret = usbip_xmit(0, ud->tcp_socket, buff, size, 0);
if (ret != size) {
dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
ret);
kfree(buff);
if (ud->side == USBIP_STUB)
usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
else
usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
return -EPIPE;
}
for (i = 0; i < np; i++) {
iso = buff + (i * sizeof(*iso));
usbip_iso_pakcet_correct_endian(iso, 0);
usbip_pack_iso(iso, &urb->iso_frame_desc[i], 0);
}
kfree(buff);
return ret;
}
EXPORT_SYMBOL_GPL(usbip_recv_iso);
/* some members of urb must be substituted before. */
int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)
{
int ret;
int size;
if (ud->side == USBIP_STUB) {
/* stub_rx.c */
/* the direction of urb must be OUT. */
if (usb_pipein(urb->pipe))
return 0;
size = urb->transfer_buffer_length;
} else {
/* vhci_rx.c */
/* the direction of urb must be IN. */
if (usb_pipeout(urb->pipe))
return 0;
size = urb->actual_length;
}
/* no need to recv xbuff */
if (!(size > 0))
return 0;
ret = usbip_xmit(0, ud->tcp_socket, (char *)urb->transfer_buffer,
size, 0);
if (ret != size) {
dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
if (ud->side == USBIP_STUB) {
usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
} else {
usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
return -EPIPE;
}
}
return ret;
}
EXPORT_SYMBOL_GPL(usbip_recv_xbuff);
/*-------------------------------------------------------------------------*/
static int __init usbip_common_init(void)
{
printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_DESC "" DRIVER_VERSION);
return 0;
}
static void __exit usbip_common_exit(void)
{
return;
}
module_init(usbip_common_init);
module_exit(usbip_common_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");