Commit eb231054 authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
Browse files

USB: add urb->unlinked field 



This patch (as970) adds a new urb->unlinked field, which is used to
store the status of unlinked URBs since we can't use urb->status for
that purpose any more.  To help simplify the HCDs, usbcore will check
urb->unlinked before calling the completion handler; if the value is
set it will automatically override the status reported by the HCD.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
CC: David Brownell <david-b@pacbell.net>
CC: Olav Kongas <ok@artecdesign.ee>
CC: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
CC: Tony Olech <tony.olech@elandigitalsystems.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent b0d9efba

drivers/usb/core/hcd.c

+12 −7
Original line number Diff line number Diff line
@@ -532,7 +532,6 @@ error: 


	/* any errors get returned through the urb completion */

	spin_lock_irq(&hcd_root_hub_lock);

	if (urb->status == -EINPROGRESS)

	urb->status = status;

	usb_hcd_unlink_urb_from_ep(hcd, urb);
@@ -1024,6 +1023,7 @@ int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb) 
	switch (hcd->state) {

	case HC_STATE_RUNNING:

	case HC_STATE_RESUMING:

		urb->unlinked = 0;

		list_add_tail(&urb->urb_list, &urb->ep->urb_list);

		break;

	default:
@@ -1071,9 +1071,9 @@ int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb, 
	/* Any status except -EINPROGRESS means something already started to

	 * unlink this URB from the hardware.  So there's no more work to do.

	 */

	if (urb->status != -EINPROGRESS)

	if (urb->unlinked)

		return -EBUSY;

	urb->status = status;

	urb->unlinked = status;



	/* IRQ setup can easily be broken so that USB controllers

	 * never get completion IRQs ... maybe even the ones we need to
@@ -1259,6 +1259,10 @@ int usb_hcd_unlink_urb (struct urb *urb, int status) 
 * (and is done using urb->hcpriv).  It also released all HCD locks;

 * the device driver won't cause problems if it frees, modifies,

 * or resubmits this URB.

 *

 * If @urb was unlinked, the value of @urb->status will be overridden by

 * @urb->unlinked.  Erroneous short transfers are detected in case

 * the HCD hasn't checked for them.

 */

void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb)

{
@@ -1266,7 +1270,9 @@ void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb) 
	usbmon_urb_complete (&hcd->self, urb);

	usb_unanchor_urb(urb);

	urb->hcpriv = NULL;

	if (unlikely((urb->transfer_flags & URB_SHORT_NOT_OK) &&

	if (unlikely(urb->unlinked))

		urb->status = urb->unlinked;

	else if (unlikely((urb->transfer_flags & URB_SHORT_NOT_OK) &&

			urb->actual_length < urb->transfer_buffer_length &&

			!urb->status))

		urb->status = -EREMOTEIO;
@@ -1305,8 +1311,7 @@ rescan: 
	list_for_each_entry (urb, &ep->urb_list, urb_list) {

		int	is_in;



		/* the urb may already have been unlinked */

		if (urb->status != -EINPROGRESS)

		if (urb->unlinked)

			continue;

		usb_get_urb (urb);

		is_in = usb_urb_dir_in(urb);

drivers/usb/gadget/dummy_hcd.c

+3 −5
Original line number Diff line number Diff line
@@ -1029,7 +1029,6 @@ static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) 
static void maybe_set_status (struct urb *urb, int status)

{

	spin_lock (&urb->lock);

	if (urb->status == -EINPROGRESS)

	urb->status = status;

	spin_unlock (&urb->lock);

}
@@ -1257,10 +1256,9 @@ restart: 
		int			type;



		urb = urbp->urb;

		if (urb->status != -EINPROGRESS) {

			/* likely it was just unlinked */

		if (urb->unlinked)

			goto return_urb;

		} else if (dum->rh_state != DUMMY_RH_RUNNING)

		else if (dum->rh_state != DUMMY_RH_RUNNING)

			continue;

		type = usb_pipetype (urb->pipe);

drivers/usb/host/ehci-q.c

+12 −17
Original line number Diff line number Diff line
@@ -151,7 +151,7 @@ static void qtd_copy_status ( 
		urb->actual_length += length - QTD_LENGTH (token);



	/* don't modify error codes */

	if (unlikely (urb->status != -EINPROGRESS))

	if (unlikely(urb->unlinked))

		return;



	/* force cleanup after short read; not always an error */
@@ -232,21 +232,14 @@ __acquires(ehci->lock) 
	}



	spin_lock (&urb->lock);

	switch (urb->status) {

	case -EINPROGRESS:		/* success */

		urb->status = 0;

	default:			/* fault */

		COUNT (ehci->stats.complete);

		break;

	case -EREMOTEIO:		/* fault or normal */

		if (!(urb->transfer_flags & URB_SHORT_NOT_OK))

	if (unlikely(urb->unlinked)) {

		COUNT(ehci->stats.unlink);

	} else {

		if (likely(urb->status == -EINPROGRESS ||

				(urb->status == -EREMOTEIO &&

				 !(urb->transfer_flags & URB_SHORT_NOT_OK))))

			urb->status = 0;

		COUNT(ehci->stats.complete);

		break;

	case -ECONNRESET:		/* canceled */

	case -ENOENT:

		COUNT (ehci->stats.unlink);

		break;

	}

	spin_unlock (&urb->lock);
@@ -364,7 +357,8 @@ qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh) 
			 * for the urb faulted (including short read) or

			 * its urb was canceled.  we may patch qh or qtds.

			 */

			if (likely (urb->status == -EINPROGRESS))

			if (likely(urb->status == -EINPROGRESS &&

					!urb->unlinked))

				continue;



			/* issue status after short control reads */
@@ -395,7 +389,8 @@ halt: 
		spin_lock (&urb->lock);

		qtd_copy_status (ehci, urb, qtd->length, token);

		if (unlikely(urb->status == -EREMOTEIO)) {

			do_status = usb_pipecontrol(urb->pipe);

			do_status = (!urb->unlinked &&

					usb_pipecontrol(urb->pipe));

			urb->status = 0;

		}

		spin_unlock (&urb->lock);

drivers/usb/host/isp116x-hcd.c

+2 −3
Original line number Diff line number Diff line
@@ -455,11 +455,10 @@ static void postproc_atl_queue(struct isp116x *isp116x) 
 done:

		if (status != -EINPROGRESS) {

			spin_lock(&urb->lock);

			if (urb->status == -EINPROGRESS)

			urb->status = status;

			spin_unlock(&urb->lock);

		}

		if (urb->status != -EINPROGRESS)

		if (urb->status != -EINPROGRESS || urb->unlinked)

			finish_request(isp116x, ep, urb);

	}

}

drivers/usb/host/ohci-q.c

+2 −3
Original line number Diff line number Diff line
@@ -758,7 +758,6 @@ static void td_done (struct ohci_hcd *ohci, struct urb *urb, struct td *td) 
			cc = TD_CC_NOERROR;

		if (cc != TD_CC_NOERROR && cc < 0x0E) {

			spin_lock (&urb->lock);

			if (urb->status == -EINPROGRESS)

			urb->status = cc_to_error[cc];

			spin_unlock (&urb->lock);

		}
@@ -972,7 +971,7 @@ rescan_this: 
			urb = td->urb;

			urb_priv = td->urb->hcpriv;



			if (urb->status == -EINPROGRESS) {

			if (!urb->unlinked) {

				prev = &td->hwNextTD;

				continue;

			}

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