Commit 831baa49 authored by David Vrabel's avatar David Vrabel Committed by Greg Kroah-Hartman
Browse files

USB: whci-hcd: make endpoint_reset method async 



usb_hcd_endpoint_reset() may be called in atomic context and must not
sleep.  So make whci-hcd's endpoint_reset() asynchronous.  URBs
submitted while the reset is in progress will be queued (on the std
list) and transfers will resume once the reset is complete.

Signed-off-by: default avatarDavid Vrabel <david.vrabel@csr.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 586dfc8c

drivers/usb/host/whci/asl.c

+11 −1
Original line number Diff line number Diff line
@@ -227,11 +227,21 @@ void scan_async_work(struct work_struct *work) 
	/*

	 * Now that the ASL is updated, complete the removal of any

	 * removed qsets.

	 *

	 * If the qset was to be reset, do so and reinsert it into the

	 * ASL if it has pending transfers.

	 */

	spin_lock_irq(&whc->lock);



	list_for_each_entry_safe(qset, t, &whc->async_removed_list, list_node) {

		qset_remove_complete(whc, qset);

		if (qset->reset) {

			qset_reset(whc, qset);

			if (!list_empty(&qset->stds)) {

				asl_qset_insert_begin(whc, qset);

				queue_work(whc->workqueue, &whc->async_work);

			}

		}

	}



	spin_unlock_irq(&whc->lock);
@@ -267,7 +277,7 @@ int asl_urb_enqueue(struct whc *whc, struct urb *urb, gfp_t mem_flags) 
	else

		err = qset_add_urb(whc, qset, urb, GFP_ATOMIC);

	if (!err) {

		if (!qset->in_sw_list)

		if (!qset->in_sw_list && !qset->remove)

			asl_qset_insert_begin(whc, qset);

	} else

		usb_hcd_unlink_urb_from_ep(&whc->wusbhc.usb_hcd, urb);

drivers/usb/host/whci/hcd.c

+6 −2
Original line number Diff line number Diff line
@@ -192,19 +192,23 @@ static void whc_endpoint_reset(struct usb_hcd *usb_hcd, 
	struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);

	struct whc *whc = wusbhc_to_whc(wusbhc);

	struct whc_qset *qset;

	unsigned long flags;



	spin_lock_irqsave(&whc->lock, flags);



	qset = ep->hcpriv;

	if (qset) {

		qset->remove = 1;

		qset->reset = 1;



		if (usb_endpoint_xfer_bulk(&ep->desc)

		    || usb_endpoint_xfer_control(&ep->desc))

			queue_work(whc->workqueue, &whc->async_work);

		else

			queue_work(whc->workqueue, &whc->periodic_work);



		qset_reset(whc, qset);

	}



	spin_unlock_irqrestore(&whc->lock, flags);

}

drivers/usb/host/whci/pzl.c

+11 −1
Original line number Diff line number Diff line
@@ -255,11 +255,21 @@ void scan_periodic_work(struct work_struct *work) 
	/*

	 * Now that the PZL is updated, complete the removal of any

	 * removed qsets.

	 *

	 * If the qset was to be reset, do so and reinsert it into the

	 * PZL if it has pending transfers.

	 */

	spin_lock_irq(&whc->lock);



	list_for_each_entry_safe(qset, t, &whc->periodic_removed_list, list_node) {

		qset_remove_complete(whc, qset);

		if (qset->reset) {

			qset_reset(whc, qset);

			if (!list_empty(&qset->stds)) {

				qset_insert_in_sw_list(whc, qset);

				queue_work(whc->workqueue, &whc->periodic_work);

			}

		}

	}



	spin_unlock_irq(&whc->lock);
@@ -295,7 +305,7 @@ int pzl_urb_enqueue(struct whc *whc, struct urb *urb, gfp_t mem_flags) 
	else

		err = qset_add_urb(whc, qset, urb, GFP_ATOMIC);

	if (!err) {

		if (!qset->in_sw_list)

		if (!qset->in_sw_list && !qset->remove)

			qset_insert_in_sw_list(whc, qset);

	} else

		usb_hcd_unlink_urb_from_ep(&whc->wusbhc.usb_hcd, urb);

drivers/usb/host/whci/qset.c

+2 −2
Original line number Diff line number Diff line
@@ -103,7 +103,6 @@ static void qset_fill_qh(struct whc_qset *qset, struct urb *urb) 
void qset_clear(struct whc *whc, struct whc_qset *qset)

{

	qset->td_start = qset->td_end = qset->ntds = 0;

	qset->remove = 0;



	qset->qh.link = cpu_to_le32(QH_LINK_NTDS(8) | QH_LINK_T);

	qset->qh.status = qset->qh.status & QH_STATUS_SEQ_MASK;
@@ -125,7 +124,7 @@ void qset_clear(struct whc *whc, struct whc_qset *qset) 
 */

void qset_reset(struct whc *whc, struct whc_qset *qset)

{

	wait_for_completion(&qset->remove_complete);

	qset->reset = 0;



	qset->qh.status &= ~QH_STATUS_SEQ_MASK;

	qset->qh.cur_window = cpu_to_le32((1 << qset->max_burst) - 1);
@@ -156,6 +155,7 @@ struct whc_qset *get_qset(struct whc *whc, struct urb *urb, 


void qset_remove_complete(struct whc *whc, struct whc_qset *qset)

{

	qset->remove = 0;

	list_del_init(&qset->list_node);

	complete(&qset->remove_complete);

}

drivers/usb/host/whci/whci-hc.h

+1 −0
Original line number Diff line number Diff line
@@ -264,6 +264,7 @@ struct whc_qset { 
	unsigned in_sw_list:1;

	unsigned in_hw_list:1;

	unsigned remove:1;

	unsigned reset:1;

	struct urb *pause_after_urb;

	struct completion remove_complete;

	int max_burst;

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