drivers/usb/usbip/vhci_rx.c

Source file repositories/reference/linux-study-clean/drivers/usb/usbip/vhci_rx.c

File Facts

System
Linux kernel
Corpus path
drivers/usb/usbip/vhci_rx.c
Extension
.c
Size
6316 bytes
Lines
271
Domain
Driver Families
Bucket
drivers/usb
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

switch (status) {
		case -ENOENT:
			fallthrough;
		case -ECONNRESET:
			dev_dbg(&urb->dev->dev,
				 "urb seq# %u was unlinked %ssynchronously\n",
				 seqnum, status == -ENOENT ? "" : "a");
			break;
		case -EINPROGRESS:
			/* no info output */
			break;
		default:
			dev_dbg(&urb->dev->dev,
				 "urb seq# %u may be in a error, status %d\n",
				 seqnum, status);
		}

		list_del(&priv->list);
		kfree(priv);
		urb->hcpriv = NULL;

		break;
	}

	return urb;
}

static void vhci_recv_ret_submit(struct vhci_device *vdev,
				 struct usbip_header *pdu)
{
	struct vhci_hcd *vhci_hcd = vdev_to_vhci_hcd(vdev);
	struct vhci *vhci = vhci_hcd->vhci;
	struct usbip_device *ud = &vdev->ud;
	struct urb *urb;
	unsigned long flags;

	spin_lock_irqsave(&vdev->priv_lock, flags);
	urb = pickup_urb_and_free_priv(vdev, pdu->base.seqnum);
	spin_unlock_irqrestore(&vdev->priv_lock, flags);

	if (!urb) {
		pr_err("cannot find a urb of seqnum %u max seqnum %u\n",
			pdu->base.seqnum,
			atomic_read(&vhci_hcd->seqnum));
		usbip_event_add(ud, VDEV_EVENT_ERROR_TCP);
		return;
	}

	/* unpack the pdu to a urb */
	usbip_pack_pdu(pdu, urb, USBIP_RET_SUBMIT, 0);

	/* recv transfer buffer */
	if (usbip_recv_xbuff(ud, urb) < 0) {
		urb->status = -EPROTO;
		goto error;
	}

	/* recv iso_packet_descriptor */
	if (usbip_recv_iso(ud, urb) < 0) {
		urb->status = -EPROTO;
		goto error;
	}

	/* restore the padding in iso packets */
	usbip_pad_iso(ud, urb);

error:
	if (usbip_dbg_flag_vhci_rx)
		usbip_dump_urb(urb);

	if (urb->num_sgs)
		urb->transfer_flags &= ~URB_DMA_MAP_SG;

	usbip_dbg_vhci_rx("now giveback urb %u\n", pdu->base.seqnum);

	spin_lock_irqsave(&vhci->lock, flags);
	usb_hcd_unlink_urb_from_ep(vhci_hcd_to_hcd(vhci_hcd), urb);
	spin_unlock_irqrestore(&vhci->lock, flags);

	usb_hcd_giveback_urb(vhci_hcd_to_hcd(vhci_hcd), urb, urb->status);

	usbip_dbg_vhci_rx("Leave\n");
}

static struct vhci_unlink *dequeue_pending_unlink(struct vhci_device *vdev,
						  struct usbip_header *pdu)
{
	struct vhci_unlink *unlink, *tmp;
	unsigned long flags;

Annotation

Implementation Notes