usbip: move usbip kernel code out of staging

At this point, USB/IP kernel code is fully functional
and can be moved out of staging.

Signed-off-by: Valentina Manea <valentina.manea.m@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 0 insertions, 594 deletions

diff --git a/drivers/staging/usbip/stub_rx.c b/drivers/staging/usbip/stub_rx.c
deleted file mode 100644
index 00e475c51a1..00000000000
--- a/drivers/staging/usbip/stub_rx.c
+++ /dev/null
@@ -1,594 +0,0 @@
-/*
- * 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 <asm/byteorder.h>
-#include <linux/kthread.h>
-#include <linux/usb.h>
-#include <linux/usb/hcd.h>
-
-#include "usbip_common.h"
-#include "stub.h"
-
-static int is_clear_halt_cmd(struct urb *urb)
-{
-	struct usb_ctrlrequest *req;
-
-	req = (struct usb_ctrlrequest *) urb->setup_packet;
-
-	 return (req->bRequest == USB_REQ_CLEAR_FEATURE) &&
-		 (req->bRequestType == USB_RECIP_ENDPOINT) &&
-		 (req->wValue == USB_ENDPOINT_HALT);
-}
-
-static int is_set_interface_cmd(struct urb *urb)
-{
-	struct usb_ctrlrequest *req;
-
-	req = (struct usb_ctrlrequest *) urb->setup_packet;
-
-	return (req->bRequest == USB_REQ_SET_INTERFACE) &&
-		(req->bRequestType == USB_RECIP_INTERFACE);
-}
-
-static int is_set_configuration_cmd(struct urb *urb)
-{
-	struct usb_ctrlrequest *req;
-
-	req = (struct usb_ctrlrequest *) urb->setup_packet;
-
-	return (req->bRequest == USB_REQ_SET_CONFIGURATION) &&
-		(req->bRequestType == USB_RECIP_DEVICE);
-}
-
-static int is_reset_device_cmd(struct urb *urb)
-{
-	struct usb_ctrlrequest *req;
-	__u16 value;
-	__u16 index;
-
-	req = (struct usb_ctrlrequest *) urb->setup_packet;
-	value = le16_to_cpu(req->wValue);
-	index = le16_to_cpu(req->wIndex);
-
-	if ((req->bRequest == USB_REQ_SET_FEATURE) &&
-	    (req->bRequestType == USB_RT_PORT) &&
-	    (value == USB_PORT_FEAT_RESET)) {
-		usbip_dbg_stub_rx("reset_device_cmd, port %u\n", index);
-		return 1;
-	} else
-		return 0;
-}
-
-static int tweak_clear_halt_cmd(struct urb *urb)
-{
-	struct usb_ctrlrequest *req;
-	int target_endp;
-	int target_dir;
-	int target_pipe;
-	int ret;
-
-	req = (struct usb_ctrlrequest *) urb->setup_packet;
-
-	/*
-	 * The stalled endpoint is specified in the wIndex value. The endpoint
-	 * of the urb is the target of this clear_halt request (i.e., control
-	 * endpoint).
-	 */
-	target_endp = le16_to_cpu(req->wIndex) & 0x000f;
-
-	/* the stalled endpoint direction is IN or OUT?. USB_DIR_IN is 0x80.  */
-	target_dir = le16_to_cpu(req->wIndex) & 0x0080;
-
-	if (target_dir)
-		target_pipe = usb_rcvctrlpipe(urb->dev, target_endp);
-	else
-		target_pipe = usb_sndctrlpipe(urb->dev, target_endp);
-
-	ret = usb_clear_halt(urb->dev, target_pipe);
-	if (ret < 0)
-		dev_err(&urb->dev->dev,
-			"usb_clear_halt error: devnum %d endp %d ret %d\n",
-			urb->dev->devnum, target_endp, ret);
-	else
-		dev_info(&urb->dev->dev,
-			 "usb_clear_halt done: devnum %d endp %d\n",
-			 urb->dev->devnum, target_endp);
-
-	return ret;
-}
-
-static int tweak_set_interface_cmd(struct urb *urb)
-{
-	struct usb_ctrlrequest *req;
-	__u16 alternate;
-	__u16 interface;
-	int ret;
-
-	req = (struct usb_ctrlrequest *) urb->setup_packet;
-	alternate = le16_to_cpu(req->wValue);
-	interface = le16_to_cpu(req->wIndex);
-
-	usbip_dbg_stub_rx("set_interface: inf %u alt %u\n",
-			  interface, alternate);
-
-	ret = usb_set_interface(urb->dev, interface, alternate);
-	if (ret < 0)
-		dev_err(&urb->dev->dev,
-			"usb_set_interface error: inf %u alt %u ret %d\n",
-			interface, alternate, ret);
-	else
-		dev_info(&urb->dev->dev,
-			"usb_set_interface done: inf %u alt %u\n",
-			interface, alternate);
-
-	return ret;
-}
-
-static int tweak_set_configuration_cmd(struct urb *urb)
-{
-	struct stub_priv *priv = (struct stub_priv *) urb->context;
-	struct stub_device *sdev = priv->sdev;
-	struct usb_ctrlrequest *req;
-	__u16 config;
-	int err;
-
-	req = (struct usb_ctrlrequest *) urb->setup_packet;
-	config = le16_to_cpu(req->wValue);
-
-	err = usb_set_configuration(sdev->udev, config);
-	if (err && err != -ENODEV)
-		dev_err(&sdev->udev->dev, "can't set config #%d, error %d\n",
-			config, err);
-	return 0;
-}
-
-static int tweak_reset_device_cmd(struct urb *urb)
-{
-	struct stub_priv *priv = (struct stub_priv *) urb->context;
-	struct stub_device *sdev = priv->sdev;
-
-	dev_info(&urb->dev->dev, "usb_queue_reset_device\n");
-
-	/*
-	 * With the implementation of pre_reset and post_reset the driver no
-	 * longer unbinds. This allows the use of synchronous reset.
-	 */
-
-	if (usb_lock_device_for_reset(sdev->udev, sdev->interface) < 0) {
-		dev_err(&urb->dev->dev, "could not obtain lock to reset device\n");
-		return 0;
-	}
-	usb_reset_device(sdev->udev);
-	usb_unlock_device(sdev->udev);
-
-	return 0;
-}
-
-/*
- * clear_halt, set_interface, and set_configuration require special tricks.
- */
-static void tweak_special_requests(struct urb *urb)
-{
-	if (!urb || !urb->setup_packet)
-		return;
-
-	if (usb_pipetype(urb->pipe) != PIPE_CONTROL)
-		return;
-
-	if (is_clear_halt_cmd(urb))
-		/* tweak clear_halt */
-		 tweak_clear_halt_cmd(urb);
-
-	else if (is_set_interface_cmd(urb))
-		/* tweak set_interface */
-		tweak_set_interface_cmd(urb);
-
-	else if (is_set_configuration_cmd(urb))
-		/* tweak set_configuration */
-		tweak_set_configuration_cmd(urb);
-
-	else if (is_reset_device_cmd(urb))
-		tweak_reset_device_cmd(urb);
-	else
-		usbip_dbg_stub_rx("no need to tweak\n");
-}
-
-/*
- * stub_recv_unlink() unlinks the URB by a call to usb_unlink_urb().
- * By unlinking the urb asynchronously, stub_rx can continuously
- * process coming urbs.  Even if the urb is unlinked, its completion
- * handler will be called and stub_tx will send a return pdu.
- *
- * See also comments about unlinking strategy in vhci_hcd.c.
- */
-static int stub_recv_cmd_unlink(struct stub_device *sdev,
-				struct usbip_header *pdu)
-{
-	int ret;
-	unsigned long flags;
-	struct stub_priv *priv;
-
-	spin_lock_irqsave(&sdev->priv_lock, flags);
-
-	list_for_each_entry(priv, &sdev->priv_init, list) {
-		if (priv->seqnum != pdu->u.cmd_unlink.seqnum)
-			continue;
-
-		dev_info(&priv->urb->dev->dev, "unlink urb %p\n",
-			 priv->urb);
-
-		/*
-		 * This matched urb is not completed yet (i.e., be in
-		 * flight in usb hcd hardware/driver). Now we are
-		 * cancelling it. The unlinking flag means that we are
-		 * now not going to return the normal result pdu of a
-		 * submission request, but going to return a result pdu
-		 * of the unlink request.
-		 */
-		priv->unlinking = 1;
-
-		/*
-		 * In the case that unlinking flag is on, prev->seqnum
-		 * is changed from the seqnum of the cancelling urb to
-		 * the seqnum of the unlink request. This will be used
-		 * to make the result pdu of the unlink request.
-		 */
-		priv->seqnum = pdu->base.seqnum;
-
-		spin_unlock_irqrestore(&sdev->priv_lock, flags);
-
-		/*
-		 * usb_unlink_urb() is now out of spinlocking to avoid
-		 * spinlock recursion since stub_complete() is
-		 * sometimes called in this context but not in the
-		 * interrupt context.  If stub_complete() is executed
-		 * before we call usb_unlink_urb(), usb_unlink_urb()
-		 * will return an error value. In this case, stub_tx
-		 * will return the result pdu of this unlink request
-		 * though submission is completed and actual unlinking
-		 * is not executed. OK?
-		 */
-		/* In the above case, urb->status is not -ECONNRESET,
-		 * so a driver in a client host will know the failure
-		 * of the unlink request ?
-		 */
-		ret = usb_unlink_urb(priv->urb);
-		if (ret != -EINPROGRESS)
-			dev_err(&priv->urb->dev->dev,
-				"failed to unlink a urb %p, ret %d\n",
-				priv->urb, ret);
-
-		return 0;
-	}
-
-	usbip_dbg_stub_rx("seqnum %d is not pending\n",
-			  pdu->u.cmd_unlink.seqnum);
-
-	/*
-	 * The urb of the unlink target is not found in priv_init queue. It was
-	 * already completed and its results is/was going to be sent by a
-	 * CMD_RET pdu. In this case, usb_unlink_urb() is not needed. We only
-	 * return the completeness of this unlink request to vhci_hcd.
-	 */
-	stub_enqueue_ret_unlink(sdev, pdu->base.seqnum, 0);
-
-	spin_unlock_irqrestore(&sdev->priv_lock, flags);
-
-	return 0;
-}
-
-static int valid_request(struct stub_device *sdev, struct usbip_header *pdu)
-{
-	struct usbip_device *ud = &sdev->ud;
-	int valid = 0;
-
-	if (pdu->base.devid == sdev->devid) {
-		spin_lock_irq(&ud->lock);
-		if (ud->status == SDEV_ST_USED) {
-			/* A request is valid. */
-			valid = 1;
-		}
-		spin_unlock_irq(&ud->lock);
-	}
-
-	return valid;
-}
-
-static struct stub_priv *stub_priv_alloc(struct stub_device *sdev,
-					 struct usbip_header *pdu)
-{
-	struct stub_priv *priv;
-	struct usbip_device *ud = &sdev->ud;
-	unsigned long flags;
-
-	spin_lock_irqsave(&sdev->priv_lock, flags);
-
-	priv = kmem_cache_zalloc(stub_priv_cache, GFP_ATOMIC);
-	if (!priv) {
-		dev_err(&sdev->interface->dev, "alloc stub_priv\n");
-		spin_unlock_irqrestore(&sdev->priv_lock, flags);
-		usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
-		return NULL;
-	}
-
-	priv->seqnum = pdu->base.seqnum;
-	priv->sdev = sdev;
-
-	/*
-	 * After a stub_priv is linked to a list_head,
-	 * our error handler can free allocated data.
-	 */
-	list_add_tail(&priv->list, &sdev->priv_init);
-
-	spin_unlock_irqrestore(&sdev->priv_lock, flags);
-
-	return priv;
-}
-
-static int get_pipe(struct stub_device *sdev, int epnum, int dir)
-{
-	struct usb_device *udev = sdev->udev;
-	struct usb_host_endpoint *ep;
-	struct usb_endpoint_descriptor *epd = NULL;
-
-	if (dir == USBIP_DIR_IN)
-		ep = udev->ep_in[epnum & 0x7f];
-	else
-		ep = udev->ep_out[epnum & 0x7f];
-	if (!ep) {
-		dev_err(&sdev->interface->dev, "no such endpoint?, %d\n",
-			epnum);
-		BUG();
-	}
-
-	epd = &ep->desc;
-	if (usb_endpoint_xfer_control(epd)) {
-		if (dir == USBIP_DIR_OUT)
-			return usb_sndctrlpipe(udev, epnum);
-		else
-			return usb_rcvctrlpipe(udev, epnum);
-	}
-
-	if (usb_endpoint_xfer_bulk(epd)) {
-		if (dir == USBIP_DIR_OUT)
-			return usb_sndbulkpipe(udev, epnum);
-		else
-			return usb_rcvbulkpipe(udev, epnum);
-	}
-
-	if (usb_endpoint_xfer_int(epd)) {
-		if (dir == USBIP_DIR_OUT)
-			return usb_sndintpipe(udev, epnum);
-		else
-			return usb_rcvintpipe(udev, epnum);
-	}
-
-	if (usb_endpoint_xfer_isoc(epd)) {
-		if (dir == USBIP_DIR_OUT)
-			return usb_sndisocpipe(udev, epnum);
-		else
-			return usb_rcvisocpipe(udev, epnum);
-	}
-
-	/* NOT REACHED */
-	dev_err(&sdev->interface->dev, "get pipe, epnum %d\n", epnum);
-	return 0;
-}
-
-static void masking_bogus_flags(struct urb *urb)
-{
-	int				xfertype;
-	struct usb_device		*dev;
-	struct usb_host_endpoint	*ep;
-	int				is_out;
-	unsigned int	allowed;
-
-	if (!urb || urb->hcpriv || !urb->complete)
-		return;
-	dev = urb->dev;
-	if ((!dev) || (dev->state < USB_STATE_UNAUTHENTICATED))
-		return;
-
-	ep = (usb_pipein(urb->pipe) ? dev->ep_in : dev->ep_out)
-		[usb_pipeendpoint(urb->pipe)];
-	if (!ep)
-		return;
-
-	xfertype = usb_endpoint_type(&ep->desc);
-	if (xfertype == USB_ENDPOINT_XFER_CONTROL) {
-		struct usb_ctrlrequest *setup =
-			(struct usb_ctrlrequest *) urb->setup_packet;
-
-		if (!setup)
-			return;
-		is_out = !(setup->bRequestType & USB_DIR_IN) ||
-			!setup->wLength;
-	} else {
-		is_out = usb_endpoint_dir_out(&ep->desc);
-	}
-
-	/* enforce simple/standard policy */
-	allowed = (URB_NO_TRANSFER_DMA_MAP | URB_NO_INTERRUPT |
-		   URB_DIR_MASK | URB_FREE_BUFFER);
-	switch (xfertype) {
-	case USB_ENDPOINT_XFER_BULK:
-		if (is_out)
-			allowed |= URB_ZERO_PACKET;
-		/* FALLTHROUGH */
-	case USB_ENDPOINT_XFER_CONTROL:
-		allowed |= URB_NO_FSBR;	/* only affects UHCI */
-		/* FALLTHROUGH */
-	default:			/* all non-iso endpoints */
-		if (!is_out)
-			allowed |= URB_SHORT_NOT_OK;
-		break;
-	case USB_ENDPOINT_XFER_ISOC:
-		allowed |= URB_ISO_ASAP;
-		break;
-	}
-	urb->transfer_flags &= allowed;
-}
-
-static void stub_recv_cmd_submit(struct stub_device *sdev,
-				 struct usbip_header *pdu)
-{
-	int ret;
-	struct stub_priv *priv;
-	struct usbip_device *ud = &sdev->ud;
-	struct usb_device *udev = sdev->udev;
-	int pipe = get_pipe(sdev, pdu->base.ep, pdu->base.direction);
-
-	priv = stub_priv_alloc(sdev, pdu);
-	if (!priv)
-		return;
-
-	/* setup a urb */
-	if (usb_pipeisoc(pipe))
-		priv->urb = usb_alloc_urb(pdu->u.cmd_submit.number_of_packets,
-					  GFP_KERNEL);
-	else
-		priv->urb = usb_alloc_urb(0, GFP_KERNEL);
-
-	if (!priv->urb) {
-		dev_err(&sdev->interface->dev, "malloc urb\n");
-		usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
-		return;
-	}
-
-	/* allocate urb transfer buffer, if needed */
-	if (pdu->u.cmd_submit.transfer_buffer_length > 0) {
-		priv->urb->transfer_buffer =
-			kzalloc(pdu->u.cmd_submit.transfer_buffer_length,
-				GFP_KERNEL);
-		if (!priv->urb->transfer_buffer) {
-			usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
-			return;
-		}
-	}
-
-	/* copy urb setup packet */
-	priv->urb->setup_packet = kmemdup(&pdu->u.cmd_submit.setup, 8,
-					  GFP_KERNEL);
-	if (!priv->urb->setup_packet) {
-		dev_err(&sdev->interface->dev, "allocate setup_packet\n");
-		usbip_event_add(ud, SDEV_EVENT_ERROR_MALLOC);
-		return;
-	}
-
-	/* set other members from the base header of pdu */
-	priv->urb->context                = (void *) priv;
-	priv->urb->dev                    = udev;
-	priv->urb->pipe                   = pipe;
-	priv->urb->complete               = stub_complete;
-
-	usbip_pack_pdu(pdu, priv->urb, USBIP_CMD_SUBMIT, 0);
-
-
-	if (usbip_recv_xbuff(ud, priv->urb) < 0)
-		return;
-
-	if (usbip_recv_iso(ud, priv->urb) < 0)
-		return;
-
-	/* no need to submit an intercepted request, but harmless? */
-	tweak_special_requests(priv->urb);
-
-	masking_bogus_flags(priv->urb);
-	/* urb is now ready to submit */
-	ret = usb_submit_urb(priv->urb, GFP_KERNEL);
-
-	if (ret == 0)
-		usbip_dbg_stub_rx("submit urb ok, seqnum %u\n",
-				  pdu->base.seqnum);
-	else {
-		dev_err(&sdev->interface->dev, "submit_urb error, %d\n", ret);
-		usbip_dump_header(pdu);
-		usbip_dump_urb(priv->urb);
-
-		/*
-		 * Pessimistic.
-		 * This connection will be discarded.
-		 */
-		usbip_event_add(ud, SDEV_EVENT_ERROR_SUBMIT);
-	}
-
-	usbip_dbg_stub_rx("Leave\n");
-}
-
-/* recv a pdu */
-static void stub_rx_pdu(struct usbip_device *ud)
-{
-	int ret;
-	struct usbip_header pdu;
-	struct stub_device *sdev = container_of(ud, struct stub_device, ud);
-	struct device *dev = &sdev->udev->dev;
-
-	usbip_dbg_stub_rx("Enter\n");
-
-	memset(&pdu, 0, sizeof(pdu));
-
-	/* receive a pdu header */
-	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);
-		return;
-	}
-
-	usbip_header_correct_endian(&pdu, 0);
-
-	if (usbip_dbg_flag_stub_rx)
-		usbip_dump_header(&pdu);
-
-	if (!valid_request(sdev, &pdu)) {
-		dev_err(dev, "recv invalid request\n");
-		usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
-		return;
-	}
-
-	switch (pdu.base.command) {
-	case USBIP_CMD_UNLINK:
-		stub_recv_cmd_unlink(sdev, &pdu);
-		break;
-
-	case USBIP_CMD_SUBMIT:
-		stub_recv_cmd_submit(sdev, &pdu);
-		break;
-
-	default:
-		/* NOTREACHED */
-		dev_err(dev, "unknown pdu\n");
-		usbip_event_add(ud, SDEV_EVENT_ERROR_TCP);
-		break;
-	}
-}
-
-int stub_rx_loop(void *data)
-{
-	struct usbip_device *ud = data;
-
-	while (!kthread_should_stop()) {
-		if (usbip_event_happened(ud))
-			break;
-
-		stub_rx_pdu(ud);
-	}
-
-	return 0;
-}