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Commit 6969408d authored by Mathias Nyman's avatar Mathias Nyman Committed by Greg Kroah-Hartman
Browse files

xhci: refactor xhci_urb_enqueue 



Use switch instead of several if statements

Signed-off-by: default avatarMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7e64b037

drivers/usb/host/xhci.c

+37 −56
Original line number Diff line number Diff line
@@ -1334,7 +1334,7 @@ int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags) 
	struct xhci_hcd *xhci = hcd_to_xhci(hcd);

	unsigned long flags;

	int ret = 0;

	unsigned int slot_id, ep_index;

	unsigned int slot_id, ep_index, ep_state;

	struct urb_priv	*urb_priv;

	int num_tds;
@@ -1348,8 +1348,7 @@ int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags) 
	if (!HCD_HW_ACCESSIBLE(hcd)) {

		if (!in_interrupt())

			xhci_dbg(xhci, "urb submitted during PCI suspend\n");

		ret = -ESHUTDOWN;

		goto exit;

		return -ESHUTDOWN;

	}



	if (usb_endpoint_xfer_isoc(&urb->ep->desc))
@@ -1386,69 +1385,51 @@ int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags) 
				return ret;

			}

		}

	}



		/* We have a spinlock and interrupts disabled, so we must pass

		 * atomic context to this function, which may allocate memory.

		 */

	spin_lock_irqsave(&xhci->lock, flags);

		if (xhci->xhc_state & XHCI_STATE_DYING)

			goto dying;



	if (xhci->xhc_state & XHCI_STATE_DYING) {

		xhci_dbg(xhci, "Ep 0x%x: URB %p submitted for non-responsive xHCI host.\n",

			 urb->ep->desc.bEndpointAddress, urb);

		ret = -ESHUTDOWN;

		goto free_priv;

	}



	switch (usb_endpoint_type(&urb->ep->desc)) {



	case USB_ENDPOINT_XFER_CONTROL:

		ret = xhci_queue_ctrl_tx(xhci, GFP_ATOMIC, urb,

					 slot_id, ep_index);

		if (ret)

			goto free_priv;

		spin_unlock_irqrestore(&xhci->lock, flags);

	} else if (usb_endpoint_xfer_bulk(&urb->ep->desc)) {

		spin_lock_irqsave(&xhci->lock, flags);

		if (xhci->xhc_state & XHCI_STATE_DYING)

			goto dying;

		if (xhci->devs[slot_id]->eps[ep_index].ep_state &

				EP_GETTING_STREAMS) {

			xhci_warn(xhci, "WARN: Can't enqueue URB while bulk ep "

					"is transitioning to using streams.\n");

			ret = -EINVAL;

		} else if (xhci->devs[slot_id]->eps[ep_index].ep_state &

				EP_GETTING_NO_STREAMS) {

			xhci_warn(xhci, "WARN: Can't enqueue URB while bulk ep "

					"is transitioning to "

					"not having streams.\n");

		break;

	case USB_ENDPOINT_XFER_BULK:

		ep_state = xhci->devs[slot_id]->eps[ep_index].ep_state;

		if (ep_state & (EP_GETTING_STREAMS | EP_GETTING_NO_STREAMS)) {

			xhci_warn(xhci, "WARN: Can't enqueue URB, ep in streams transition state %x\n",

				  ep_state);

			ret = -EINVAL;

		} else {

			break;

		}

		ret = xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb,

					 slot_id, ep_index);

		}

		if (ret)

			goto free_priv;

		spin_unlock_irqrestore(&xhci->lock, flags);

	} else if (usb_endpoint_xfer_int(&urb->ep->desc)) {

		spin_lock_irqsave(&xhci->lock, flags);

		if (xhci->xhc_state & XHCI_STATE_DYING)

			goto dying;

		break;





	case USB_ENDPOINT_XFER_INT:

		ret = xhci_queue_intr_tx(xhci, GFP_ATOMIC, urb,

				slot_id, ep_index);

		if (ret)

			goto free_priv;

		spin_unlock_irqrestore(&xhci->lock, flags);

	} else {

		spin_lock_irqsave(&xhci->lock, flags);

		if (xhci->xhc_state & XHCI_STATE_DYING)

			goto dying;

		break;



	case USB_ENDPOINT_XFER_ISOC:

		ret = xhci_queue_isoc_tx_prepare(xhci, GFP_ATOMIC, urb,

				slot_id, ep_index);

		if (ret)

			goto free_priv;

		spin_unlock_irqrestore(&xhci->lock, flags);

	}

exit:

	return ret;

dying:

	xhci_dbg(xhci, "Ep 0x%x: URB %p submitted for "

			"non-responsive xHCI host.\n",

			urb->ep->desc.bEndpointAddress, urb);

	ret = -ESHUTDOWN;



	if (ret) {

free_priv:

		xhci_urb_free_priv(urb_priv);

		urb->hcpriv = NULL;

	}

	spin_unlock_irqrestore(&xhci->lock, flags);

	return ret;

}