[PATCH 3.2 057/140] staging: usbip: removed dead code from receive function

Ben Hutchings
2018-02-28T16:07:47Z

From: Bart Westgeest <bart@elbrys.com>

commit 5a08c5267e45fe936452051a8c126e8418984eb7 upstream.

The usbip_xmit function supported sending and receiving data, however
the sending part of the function was never used/executed. Renamed the
function to usbip_recv, and removed the unused code.

Signed-off-by: Bart Westgeest <bart@elbrys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/staging/usbip/stub_rx.c | 2 +-
drivers/staging/usbip/usbip_common.c | 61 ++++++++++--------------------------
drivers/staging/usbip/usbip_common.h | 3 +-
drivers/staging/usbip/vhci_rx.c | 2 +-
4 files changed, 20 insertions(+), 48 deletions(-)

--- a/drivers/staging/usbip/stub_rx.c
+++ b/drivers/staging/usbip/stub_rx.c
@@ -586,7 +586,7 @@ static void stub_rx_pdu(struct usbip_dev
memset(&pdu, 0, sizeof(pdu));

/* 1. receive a pdu header */
- ret = usbip_xmit(0, ud->tcp_socket, (char *) &pdu, sizeof(pdu), 0);
+ ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu));
if (ret != sizeof(pdu)) {
dev_err(dev, "recv a header, %d\n", ret);
usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
--- a/drivers/staging/usbip/usbip_common.c
+++ b/drivers/staging/usbip/usbip_common.c
@@ -334,9 +334,8 @@ void usbip_dump_header(struct usbip_head
}
EXPORT_SYMBOL_GPL(usbip_dump_header);

-/* 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)
+/* Receive data over TCP/IP. */
+int usbip_recv(struct socket *sock, void *buf, int size)
{
int result;
struct msghdr msg;
@@ -355,19 +354,6 @@ int usbip_xmit(int send, struct socket *
return -EINVAL;
}

- if (usbip_dbg_flag_xmit) {
- if (send) {
- if (!in_interrupt())
- pr_debug("%-10s:", current->comm);
- else
- pr_debug("interrupt :");
-
- pr_debug("sending... , sock %p, buf %p, size %d, "
- "msg_flags %d\n", sock, buf, size, msg_flags);
- usbip_dump_buffer(buf, size);
- }
- }
-
do {
sock->sk->sk_allocation = GFP_NOIO;
iov.iov_base = buf;
@@ -377,42 +363,30 @@ int usbip_xmit(int send, struct socket *
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);
+ msg.msg_flags = MSG_NOSIGNAL;

+ result = kernel_recvmsg(sock, &msg, &iov, 1, size, MSG_WAITALL);
if (result <= 0) {
- pr_debug("%s sock %p buf %p size %u ret %d total %d\n",
- send ? "send" : "receive", sock, buf, size,
- result, total);
+ pr_debug("receive sock %p buf %p size %u ret %d total %d\n",
+ 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())
- pr_debug("%-10s:", current->comm);
- else
- pr_debug("interrupt :");
-
- pr_debug("receiving....\n");
- usbip_dump_buffer(bp, osize);
- pr_debug("received, osize %d ret %d size %d total %d\n",
- osize, result, size, total);
- }
+ if (!in_interrupt())
+ pr_debug("%-10s:", current->comm);
+ else
+ pr_debug("interrupt :");

- if (send)
- pr_debug("send, total %d\n", total);
+ pr_debug("receiving....\n");
+ usbip_dump_buffer(bp, osize);
+ pr_debug("received, osize %d ret %d size %d total %d\n",
+ osize, result, size, total);
}

return total;
@@ -420,7 +394,7 @@ int usbip_xmit(int send, struct socket *
err:
return result;
}
-EXPORT_SYMBOL_GPL(usbip_xmit);
+EXPORT_SYMBOL_GPL(usbip_recv);

struct socket *sockfd_to_socket(unsigned int sockfd)
{
@@ -712,7 +686,7 @@ int usbip_recv_iso(struct usbip_device *
if (!buff)
return -ENOMEM;

- ret = usbip_xmit(0, ud->tcp_socket, buff, size, 0);
+ ret = usbip_recv(ud->tcp_socket, buff, size);
if (ret != size) {
dev_err(&urb->dev->dev, "recv iso_frame_descriptor, %d\n",
ret);
@@ -831,8 +805,7 @@ int usbip_recv_xbuff(struct usbip_device
}
}

- ret = usbip_xmit(0, ud->tcp_socket, (char *)urb->transfer_buffer,
- size, 0);
+ ret = usbip_recv(ud->tcp_socket, urb->transfer_buffer, size);
if (ret != size) {
dev_err(&urb->dev->dev, "recv xbuf, %d\n", ret);
if (ud->side == USBIP_STUB) {
--- a/drivers/staging/usbip/usbip_common.h
+++ b/drivers/staging/usbip/usbip_common.h
@@ -306,8 +306,7 @@ void setreuse(struct socket *);
void usbip_dump_urb(struct urb *purb);
void usbip_dump_header(struct usbip_header *pdu);

-int usbip_xmit(int send, struct socket *sock, char *buf, int size,
- int msg_flags);
+int usbip_recv(struct socket *sock, void *buf, int size);
struct socket *sockfd_to_socket(unsigned int sockfd);

void usbip_pack_pdu(struct usbip_header *pdu, struct urb *urb, int cmd,
--- a/drivers/staging/usbip/vhci_rx.c
+++ b/drivers/staging/usbip/vhci_rx.c
@@ -205,7 +205,7 @@ static void vhci_rx_pdu(struct usbip_dev
memset(&pdu, 0, sizeof(pdu));

/* 1. receive a pdu header */
- ret = usbip_xmit(0, ud->tcp_socket, (char *) &pdu, sizeof(pdu), 0);
+ ret = usbip_recv(ud->tcp_socket, &pdu, sizeof(pdu));
if (ret < 0) {
if (ret == -ECONNRESET)
pr_info("connection reset by peer\n");