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256 lines
5.9 KiB
256 lines
5.9 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/kthread.h> |
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#include <linux/slab.h> |
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#include <linux/scatterlist.h> |
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#include "usbip_common.h" |
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#include "vhci.h" |
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static void setup_cmd_submit_pdu(struct usbip_header *pdup, struct urb *urb) |
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{ |
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struct vhci_priv *priv = ((struct vhci_priv *)urb->hcpriv); |
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struct vhci_device *vdev = priv->vdev; |
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usbip_dbg_vhci_tx("URB, local devnum %u, remote devid %u\n", |
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usb_pipedevice(urb->pipe), vdev->devid); |
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pdup->base.command = USBIP_CMD_SUBMIT; |
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pdup->base.seqnum = priv->seqnum; |
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pdup->base.devid = vdev->devid; |
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pdup->base.direction = usb_pipein(urb->pipe) ? |
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USBIP_DIR_IN : USBIP_DIR_OUT; |
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pdup->base.ep = usb_pipeendpoint(urb->pipe); |
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usbip_pack_pdu(pdup, urb, USBIP_CMD_SUBMIT, 1); |
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if (urb->setup_packet) |
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memcpy(pdup->u.cmd_submit.setup, urb->setup_packet, 8); |
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} |
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static struct vhci_priv *dequeue_from_priv_tx(struct vhci_device *vdev) |
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{ |
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struct vhci_priv *priv, *tmp; |
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unsigned long flags; |
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spin_lock_irqsave(&vdev->priv_lock, flags); |
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list_for_each_entry_safe(priv, tmp, &vdev->priv_tx, list) { |
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list_move_tail(&priv->list, &vdev->priv_rx); |
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spin_unlock_irqrestore(&vdev->priv_lock, flags); |
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return priv; |
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} |
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spin_unlock_irqrestore(&vdev->priv_lock, flags); |
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return NULL; |
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} |
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static int vhci_send_cmd_submit(struct vhci_device *vdev) |
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{ |
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struct usbip_iso_packet_descriptor *iso_buffer = NULL; |
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struct vhci_priv *priv = NULL; |
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struct scatterlist *sg; |
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struct msghdr msg; |
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struct kvec *iov; |
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size_t txsize; |
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size_t total_size = 0; |
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int iovnum; |
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int err = -ENOMEM; |
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int i; |
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while ((priv = dequeue_from_priv_tx(vdev)) != NULL) { |
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int ret; |
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struct urb *urb = priv->urb; |
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struct usbip_header pdu_header; |
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txsize = 0; |
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memset(&pdu_header, 0, sizeof(pdu_header)); |
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memset(&msg, 0, sizeof(msg)); |
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memset(&iov, 0, sizeof(iov)); |
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usbip_dbg_vhci_tx("setup txdata urb seqnum %lu\n", |
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priv->seqnum); |
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if (urb->num_sgs && usb_pipeout(urb->pipe)) |
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iovnum = 2 + urb->num_sgs; |
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else |
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iovnum = 3; |
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iov = kcalloc(iovnum, sizeof(*iov), GFP_KERNEL); |
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if (!iov) { |
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usbip_event_add(&vdev->ud, SDEV_EVENT_ERROR_MALLOC); |
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return -ENOMEM; |
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} |
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if (urb->num_sgs) |
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urb->transfer_flags |= URB_DMA_MAP_SG; |
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/* 1. setup usbip_header */ |
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setup_cmd_submit_pdu(&pdu_header, urb); |
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usbip_header_correct_endian(&pdu_header, 1); |
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iovnum = 0; |
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iov[iovnum].iov_base = &pdu_header; |
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iov[iovnum].iov_len = sizeof(pdu_header); |
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txsize += sizeof(pdu_header); |
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iovnum++; |
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/* 2. setup transfer buffer */ |
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if (!usb_pipein(urb->pipe) && urb->transfer_buffer_length > 0) { |
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if (urb->num_sgs && |
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!usb_endpoint_xfer_isoc(&urb->ep->desc)) { |
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for_each_sg(urb->sg, sg, urb->num_sgs, i) { |
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iov[iovnum].iov_base = sg_virt(sg); |
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iov[iovnum].iov_len = sg->length; |
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iovnum++; |
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} |
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} else { |
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iov[iovnum].iov_base = urb->transfer_buffer; |
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iov[iovnum].iov_len = |
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urb->transfer_buffer_length; |
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iovnum++; |
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} |
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txsize += urb->transfer_buffer_length; |
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} |
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/* 3. setup iso_packet_descriptor */ |
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if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) { |
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ssize_t len = 0; |
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iso_buffer = usbip_alloc_iso_desc_pdu(urb, &len); |
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if (!iso_buffer) { |
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usbip_event_add(&vdev->ud, |
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SDEV_EVENT_ERROR_MALLOC); |
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goto err_iso_buffer; |
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} |
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iov[iovnum].iov_base = iso_buffer; |
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iov[iovnum].iov_len = len; |
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iovnum++; |
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txsize += len; |
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} |
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ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, iov, iovnum, |
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txsize); |
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if (ret != txsize) { |
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pr_err("sendmsg failed!, ret=%d for %zd\n", ret, |
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txsize); |
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usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP); |
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err = -EPIPE; |
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goto err_tx; |
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} |
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kfree(iov); |
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/* This is only for isochronous case */ |
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kfree(iso_buffer); |
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iso_buffer = NULL; |
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usbip_dbg_vhci_tx("send txdata\n"); |
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total_size += txsize; |
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} |
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return total_size; |
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err_tx: |
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kfree(iso_buffer); |
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err_iso_buffer: |
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kfree(iov); |
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return err; |
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} |
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static struct vhci_unlink *dequeue_from_unlink_tx(struct vhci_device *vdev) |
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{ |
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struct vhci_unlink *unlink, *tmp; |
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unsigned long flags; |
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spin_lock_irqsave(&vdev->priv_lock, flags); |
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list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) { |
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list_move_tail(&unlink->list, &vdev->unlink_rx); |
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spin_unlock_irqrestore(&vdev->priv_lock, flags); |
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return unlink; |
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} |
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spin_unlock_irqrestore(&vdev->priv_lock, flags); |
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return NULL; |
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} |
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static int vhci_send_cmd_unlink(struct vhci_device *vdev) |
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{ |
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struct vhci_unlink *unlink = NULL; |
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struct msghdr msg; |
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struct kvec iov; |
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size_t txsize; |
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size_t total_size = 0; |
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while ((unlink = dequeue_from_unlink_tx(vdev)) != NULL) { |
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int ret; |
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struct usbip_header pdu_header; |
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memset(&pdu_header, 0, sizeof(pdu_header)); |
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memset(&msg, 0, sizeof(msg)); |
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memset(&iov, 0, sizeof(iov)); |
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usbip_dbg_vhci_tx("setup cmd unlink, %lu\n", unlink->seqnum); |
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/* 1. setup usbip_header */ |
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pdu_header.base.command = USBIP_CMD_UNLINK; |
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pdu_header.base.seqnum = unlink->seqnum; |
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pdu_header.base.devid = vdev->devid; |
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pdu_header.base.ep = 0; |
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pdu_header.u.cmd_unlink.seqnum = unlink->unlink_seqnum; |
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usbip_header_correct_endian(&pdu_header, 1); |
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iov.iov_base = &pdu_header; |
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iov.iov_len = sizeof(pdu_header); |
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txsize = sizeof(pdu_header); |
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ret = kernel_sendmsg(vdev->ud.tcp_socket, &msg, &iov, 1, txsize); |
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if (ret != txsize) { |
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pr_err("sendmsg failed!, ret=%d for %zd\n", ret, |
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txsize); |
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usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_TCP); |
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return -1; |
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} |
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usbip_dbg_vhci_tx("send txdata\n"); |
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total_size += txsize; |
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} |
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return total_size; |
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} |
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int vhci_tx_loop(void *data) |
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{ |
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struct usbip_device *ud = data; |
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struct vhci_device *vdev = container_of(ud, struct vhci_device, ud); |
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while (!kthread_should_stop()) { |
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if (vhci_send_cmd_submit(vdev) < 0) |
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break; |
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if (vhci_send_cmd_unlink(vdev) < 0) |
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break; |
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wait_event_interruptible(vdev->waitq_tx, |
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(!list_empty(&vdev->priv_tx) || |
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!list_empty(&vdev->unlink_tx) || |
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kthread_should_stop())); |
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usbip_dbg_vhci_tx("pending urbs ?, now wake up\n"); |
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} |
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return 0; |
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}
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