[mirror_ubuntu-artful-kernel.git] / drivers / usb / host / whci / asl.c

/*
 * Wireless Host Controller (WHC) asynchronous schedule management.
 *
 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <linux/kernel.h>
#include <linux/dma-mapping.h>
#include <linux/uwb/umc.h>
#include <linux/usb.h>

#include "../../wusbcore/wusbhc.h"

#include "whcd.h"

static void qset_get_next_prev(struct whc *whc, struct whc_qset *qset,
			       struct whc_qset **next, struct whc_qset **prev)
{
	struct list_head *n, *p;

	BUG_ON(list_empty(&whc->async_list));

	n = qset->list_node.next;
	if (n == &whc->async_list)
		n = n->next;
	p = qset->list_node.prev;
	if (p == &whc->async_list)
		p = p->prev;

	*next = container_of(n, struct whc_qset, list_node);
	*prev = container_of(p, struct whc_qset, list_node);

}

static void asl_qset_insert_begin(struct whc *whc, struct whc_qset *qset)
{
	list_move(&qset->list_node, &whc->async_list);
	qset->in_sw_list = true;
}

static void asl_qset_insert(struct whc *whc, struct whc_qset *qset)
{
	struct whc_qset *next, *prev;

	qset_clear(whc, qset);

	/* Link into ASL. */
	qset_get_next_prev(whc, qset, &next, &prev);
	whc_qset_set_link_ptr(&qset->qh.link, next->qset_dma);
	whc_qset_set_link_ptr(&prev->qh.link, qset->qset_dma);
	qset->in_hw_list = true;
}

static void asl_qset_remove(struct whc *whc, struct whc_qset *qset)
{
	struct whc_qset *prev, *next;

	qset_get_next_prev(whc, qset, &next, &prev);

	list_move(&qset->list_node, &whc->async_removed_list);
	qset->in_sw_list = false;

	/*
	 * No more qsets in the ASL?  The caller must stop the ASL as
	 * it's no longer valid.
	 */
	if (list_empty(&whc->async_list))
		return;

	/* Remove from ASL. */
	whc_qset_set_link_ptr(&prev->qh.link, next->qset_dma);
	qset->in_hw_list = false;
}

/**
 * process_qset - process any recently inactivated or halted qTDs in a
 * qset.
 *
 * After inactive qTDs are removed, new qTDs can be added if the
 * urb queue still contains URBs.
 *
 * Returns any additional WUSBCMD bits for the ASL sync command (i.e.,
 * WUSBCMD_ASYNC_QSET_RM if a halted qset was removed).
 */
static uint32_t process_qset(struct whc *whc, struct whc_qset *qset)
{
	enum whc_update update = 0;
	uint32_t status = 0;

	while (qset->ntds) {
		struct whc_qtd *td;
		int t;

		t = qset->td_start;
		td = &qset->qtd[qset->td_start];
		status = le32_to_cpu(td->status);

		/*
		 * Nothing to do with a still active qTD.
		 */
		if (status & QTD_STS_ACTIVE)
			break;

		if (status & QTD_STS_HALTED) {
			/* Ug, an error. */
			process_halted_qtd(whc, qset, td);
			goto done;
		}

		/* Mmm, a completed qTD. */
		process_inactive_qtd(whc, qset, td);
	}

	if (!qset->remove)
		update |= qset_add_qtds(whc, qset);

done:
	/*
	 * Remove this qset from the ASL if requested, but only if has
	 * no qTDs.
	 */
	if (qset->remove && qset->ntds == 0) {
		asl_qset_remove(whc, qset);
		update |= WHC_UPDATE_REMOVED;
	}
	return update;
}

void asl_start(struct whc *whc)
{
	struct whc_qset *qset;

	qset = list_first_entry(&whc->async_list, struct whc_qset, list_node);

	le_writeq(qset->qset_dma | QH_LINK_NTDS(8), whc->base + WUSBASYNCLISTADDR);

	whc_write_wusbcmd(whc, WUSBCMD_ASYNC_EN, WUSBCMD_ASYNC_EN);
	whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
		      WUSBSTS_ASYNC_SCHED, WUSBSTS_ASYNC_SCHED,
		      1000, "start ASL");
}

void asl_stop(struct whc *whc)
{
	whc_write_wusbcmd(whc, WUSBCMD_ASYNC_EN, 0);
	whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
		      WUSBSTS_ASYNC_SCHED, 0,
		      1000, "stop ASL");
}

/**
 * asl_update - request an ASL update and wait for the hardware to be synced
 * @whc: the WHCI HC
 * @wusbcmd: WUSBCMD value to start the update.
 *
 * If the WUSB HC is inactive (i.e., the ASL is stopped) then the
 * update must be skipped as the hardware may not respond to update
 * requests.
 */
void asl_update(struct whc *whc, uint32_t wusbcmd)
{
	struct wusbhc *wusbhc = &whc->wusbhc;
	long t;

	mutex_lock(&wusbhc->mutex);
	if (wusbhc->active) {
		whc_write_wusbcmd(whc, wusbcmd, wusbcmd);
		t = wait_event_timeout(
			whc->async_list_wq,
			(le_readl(whc->base + WUSBCMD) & WUSBCMD_ASYNC_UPDATED) == 0,
			msecs_to_jiffies(1000));
		if (t == 0)
			whc_hw_error(whc, "ASL update timeout");
	}
	mutex_unlock(&wusbhc->mutex);
}

/**
 * scan_async_work - scan the ASL for qsets to process.
 *
 * Process each qset in the ASL in turn and then signal the WHC that
 * the ASL has been updated.
 *
 * Then start, stop or update the asynchronous schedule as required.
 */
void scan_async_work(struct work_struct *work)
{
	struct whc *whc = container_of(work, struct whc, async_work);
	struct whc_qset *qset, *t;
	enum whc_update update = 0;

	spin_lock_irq(&whc->lock);

	/*
	 * Transerve the software list backwards so new qsets can be
	 * safely inserted into the ASL without making it non-circular.
	 */
	list_for_each_entry_safe_reverse(qset, t, &whc->async_list, list_node) {
		if (!qset->in_hw_list) {
			asl_qset_insert(whc, qset);
			update |= WHC_UPDATE_ADDED;
		}

		update |= process_qset(whc, qset);
	}

	spin_unlock_irq(&whc->lock);

	if (update) {
		uint32_t wusbcmd = WUSBCMD_ASYNC_UPDATED | WUSBCMD_ASYNC_SYNCED_DB;
		if (update & WHC_UPDATE_REMOVED)
			wusbcmd |= WUSBCMD_ASYNC_QSET_RM;
		asl_update(whc, wusbcmd);
	}

	/*
	 * Now that the ASL is updated, complete the removal of any
	 * removed qsets.
	 */
	spin_lock_irq(&whc->lock);

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

	spin_unlock_irq(&whc->lock);
}

/**
 * asl_urb_enqueue - queue an URB onto the asynchronous list (ASL).
 * @whc: the WHCI host controller
 * @urb: the URB to enqueue
 * @mem_flags: flags for any memory allocations
 *
 * The qset for the endpoint is obtained and the urb queued on to it.
 *
 * Work is scheduled to update the hardware's view of the ASL.
 */
int asl_urb_enqueue(struct whc *whc, struct urb *urb, gfp_t mem_flags)
{
	struct whc_qset *qset;
	int err;
	unsigned long flags;

	spin_lock_irqsave(&whc->lock, flags);

	err = usb_hcd_link_urb_to_ep(&whc->wusbhc.usb_hcd, urb);
	if (err < 0) {
		spin_unlock_irqrestore(&whc->lock, flags);
		return err;
	}

	qset = get_qset(whc, urb, GFP_ATOMIC);
	if (qset == NULL)
		err = -ENOMEM;
	else
		err = qset_add_urb(whc, qset, urb, GFP_ATOMIC);
	if (!err) {
		if (!qset->in_sw_list)
			asl_qset_insert_begin(whc, qset);
	} else
		usb_hcd_unlink_urb_from_ep(&whc->wusbhc.usb_hcd, urb);

	spin_unlock_irqrestore(&whc->lock, flags);

	if (!err)
		queue_work(whc->workqueue, &whc->async_work);

	return err;
}

/**
 * asl_urb_dequeue - remove an URB (qset) from the async list.
 * @whc: the WHCI host controller
 * @urb: the URB to dequeue
 * @status: the current status of the URB
 *
 * URBs that do yet have qTDs can simply be removed from the software
 * queue, otherwise the qset must be removed from the ASL so the qTDs
 * can be removed.
 */
int asl_urb_dequeue(struct whc *whc, struct urb *urb, int status)
{
	struct whc_urb *wurb = urb->hcpriv;
	struct whc_qset *qset = wurb->qset;
	struct whc_std *std, *t;
	int ret;
	unsigned long flags;

	spin_lock_irqsave(&whc->lock, flags);

	ret = usb_hcd_check_unlink_urb(&whc->wusbhc.usb_hcd, urb, status);
	if (ret < 0)
		goto out;

	list_for_each_entry_safe(std, t, &qset->stds, list_node) {
		if (std->urb == urb)
			qset_free_std(whc, std);
		else
			std->qtd = NULL; /* so this std is re-added when the qset is */
	}

	asl_qset_remove(whc, qset);
	wurb->status = status;
	wurb->is_async = true;
	queue_work(whc->workqueue, &wurb->dequeue_work);

out:
	spin_unlock_irqrestore(&whc->lock, flags);

	return ret;
}

/**
 * asl_qset_delete - delete a qset from the ASL
 */
void asl_qset_delete(struct whc *whc, struct whc_qset *qset)
{
	qset->remove = 1;
	queue_work(whc->workqueue, &whc->async_work);
	qset_delete(whc, qset);
}

/**
 * asl_init - initialize the asynchronous schedule list
 *
 * A dummy qset with no qTDs is added to the ASL to simplify removing
 * qsets (no need to stop the ASL when the last qset is removed).
 */
int asl_init(struct whc *whc)
{
	struct whc_qset *qset;

	qset = qset_alloc(whc, GFP_KERNEL);
	if (qset == NULL)
		return -ENOMEM;

	asl_qset_insert_begin(whc, qset);
	asl_qset_insert(whc, qset);

	return 0;
}

/**
 * asl_clean_up - free ASL resources
 *
 * The ASL is stopped and empty except for the dummy qset.
 */
void asl_clean_up(struct whc *whc)
{
	struct whc_qset *qset;

	if (!list_empty(&whc->async_list)) {
		qset = list_first_entry(&whc->async_list, struct whc_qset, list_node);
		list_del(&qset->list_node);
		qset_free(whc, qset);
	}
}
Commit	Line	Data
7e6133aa DV	1	/*
	2	* Wireless Host Controller (WHC) asynchronous schedule management.
	3	*
	4	* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License version
	8	* 2 as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	17	*/
	18	#include <linux/kernel.h>
	19	#include <linux/dma-mapping.h>
	20	#include <linux/uwb/umc.h>
	21	#include <linux/usb.h>
7e6133aa DV	22
	23	#include "../../wusbcore/wusbhc.h"
	24
	25	#include "whcd.h"
	26
7e6133aa DV	27	static void qset_get_next_prev(struct whc whc, struct whc_qset qset,
	28	struct whc_qset next, struct whc_qset prev)
	29	{
	30	struct list_head n, p;
	31
	32	BUG_ON(list_empty(&whc->async_list));
	33
	34	n = qset->list_node.next;
	35	if (n == &whc->async_list)
	36	n = n->next;
	37	p = qset->list_node.prev;
	38	if (p == &whc->async_list)
	39	p = p->prev;
	40
	41	*next = container_of(n, struct whc_qset, list_node);
	42	*prev = container_of(p, struct whc_qset, list_node);
	43
	44	}
	45
	46	static void asl_qset_insert_begin(struct whc whc, struct whc_qset qset)
	47	{
	48	list_move(&qset->list_node, &whc->async_list);
	49	qset->in_sw_list = true;
	50	}
	51
	52	static void asl_qset_insert(struct whc whc, struct whc_qset qset)
	53	{
	54	struct whc_qset next, prev;
	55
	56	qset_clear(whc, qset);
	57
	58	/* Link into ASL. */
	59	qset_get_next_prev(whc, qset, &next, &prev);
	60	whc_qset_set_link_ptr(&qset->qh.link, next->qset_dma);
	61	whc_qset_set_link_ptr(&prev->qh.link, qset->qset_dma);
	62	qset->in_hw_list = true;
	63	}
	64
	65	static void asl_qset_remove(struct whc whc, struct whc_qset qset)
	66	{
	67	struct whc_qset prev, next;
	68
	69	qset_get_next_prev(whc, qset, &next, &prev);
	70
	71	list_move(&qset->list_node, &whc->async_removed_list);
	72	qset->in_sw_list = false;
	73
	74	/*
	75	* No more qsets in the ASL? The caller must stop the ASL as
	76	* it's no longer valid.
	77	*/
	78	if (list_empty(&whc->async_list))
	79	return;
	80
	81	/* Remove from ASL. */
	82	whc_qset_set_link_ptr(&prev->qh.link, next->qset_dma);
	83	qset->in_hw_list = false;
	84	}
	85
	86	/**
	87	* process_qset - process any recently inactivated or halted qTDs in a
	88	* qset.
	89	*
	90	* After inactive qTDs are removed, new qTDs can be added if the
91	* urb queue still contains URBs.
92	*
93	* Returns any additional WUSBCMD bits for the ASL sync command (i.e.,
94	* WUSBCMD_ASYNC_QSET_RM if a halted qset was removed).
95	*/
96	static uint32_t process_qset(struct whc whc, struct whc_qset qset)
97	{
98	enum whc_update update = 0;
99	uint32_t status = 0;
100
101	while (qset->ntds) {
102	struct whc_qtd *td;
103	int t;
104
105	t = qset->td_start;
106	td = &qset->qtd[qset->td_start];
107	status = le32_to_cpu(td->status);
108
109	/*
110	* Nothing to do with a still active qTD.
111	*/
112	if (status & QTD_STS_ACTIVE)
113	break;
114
115	if (status & QTD_STS_HALTED) {
116	/* Ug, an error. */
117	process_halted_qtd(whc, qset, td);
118	goto done;
119	}
120
121	/* Mmm, a completed qTD. */
122	process_inactive_qtd(whc, qset, td);
123	}
124
7f0406db DV	125	if (!qset->remove)
7f0406db DV	126	update \|= qset_add_qtds(whc, qset);
7e6133aa DV	127
	128	done:
	129	/*
	130	* Remove this qset from the ASL if requested, but only if has
	131	* no qTDs.
	132	*/
	133	if (qset->remove && qset->ntds == 0) {
	134	asl_qset_remove(whc, qset);
	135	update \|= WHC_UPDATE_REMOVED;
	136	}
	137	return update;
	138	}
	139
	140	void asl_start(struct whc *whc)
	141	{
	142	struct whc_qset *qset;
	143
	144	qset = list_first_entry(&whc->async_list, struct whc_qset, list_node);
	145
	146	le_writeq(qset->qset_dma \| QH_LINK_NTDS(8), whc->base + WUSBASYNCLISTADDR);
	147
	148	whc_write_wusbcmd(whc, WUSBCMD_ASYNC_EN, WUSBCMD_ASYNC_EN);
	149	whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
	150	WUSBSTS_ASYNC_SCHED, WUSBSTS_ASYNC_SCHED,
	151	1000, "start ASL");
	152	}
	153
	154	void asl_stop(struct whc *whc)
	155	{
	156	whc_write_wusbcmd(whc, WUSBCMD_ASYNC_EN, 0);
	157	whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
	158	WUSBSTS_ASYNC_SCHED, 0,
	159	1000, "stop ASL");
	160	}
	161
56968d0c DV	162	/**
	163	* asl_update - request an ASL update and wait for the hardware to be synced
	164	* @whc: the WHCI HC
	165	* @wusbcmd: WUSBCMD value to start the update.
	166	*
	167	* If the WUSB HC is inactive (i.e., the ASL is stopped) then the
	168	* update must be skipped as the hardware may not respond to update
	169	* requests.
	170	*/
7e6133aa DV	171	void asl_update(struct whc *whc, uint32_t wusbcmd)
7e6133aa DV	172	{
56968d0c	173	struct wusbhc *wusbhc = &whc->wusbhc;
a5e6ced5	174	long t;
56968d0c DV	175
	176	mutex_lock(&wusbhc->mutex);
	177	if (wusbhc->active) {
	178	whc_write_wusbcmd(whc, wusbcmd, wusbcmd);
a5e6ced5 DV	179	t = wait_event_timeout(
	180	whc->async_list_wq,
	181	(le_readl(whc->base + WUSBCMD) & WUSBCMD_ASYNC_UPDATED) == 0,
	182	msecs_to_jiffies(1000));
	183	if (t == 0)
	184	whc_hw_error(whc, "ASL update timeout");
56968d0c DV	185	}
56968d0c DV	186	mutex_unlock(&wusbhc->mutex);
7e6133aa DV	187	}
	188
	189	/**
	190	* scan_async_work - scan the ASL for qsets to process.
	191	*
	192	* Process each qset in the ASL in turn and then signal the WHC that
	193	* the ASL has been updated.
	194	*
	195	* Then start, stop or update the asynchronous schedule as required.
	196	*/
	197	void scan_async_work(struct work_struct *work)
	198	{
	199	struct whc *whc = container_of(work, struct whc, async_work);
	200	struct whc_qset qset, t;
	201	enum whc_update update = 0;
	202
	203	spin_lock_irq(&whc->lock);
	204
7e6133aa DV	205	/*
	206	* Transerve the software list backwards so new qsets can be
	207	* safely inserted into the ASL without making it non-circular.
	208	*/
	209	list_for_each_entry_safe_reverse(qset, t, &whc->async_list, list_node) {
	210	if (!qset->in_hw_list) {
	211	asl_qset_insert(whc, qset);
	212	update \|= WHC_UPDATE_ADDED;
	213	}
	214
	215	update \|= process_qset(whc, qset);
	216	}
	217
7e6133aa DV	218	spin_unlock_irq(&whc->lock);
	219
	220	if (update) {
	221	uint32_t wusbcmd = WUSBCMD_ASYNC_UPDATED \| WUSBCMD_ASYNC_SYNCED_DB;
	222	if (update & WHC_UPDATE_REMOVED)
	223	wusbcmd \|= WUSBCMD_ASYNC_QSET_RM;
	224	asl_update(whc, wusbcmd);
	225	}
	226
	227	/*
	228	* Now that the ASL is updated, complete the removal of any
	229	* removed qsets.
	230	*/
a3c1239e	231	spin_lock_irq(&whc->lock);
7e6133aa DV	232
	233	list_for_each_entry_safe(qset, t, &whc->async_removed_list, list_node) {
	234	qset_remove_complete(whc, qset);
	235	}
	236
a3c1239e	237	spin_unlock_irq(&whc->lock);
7e6133aa DV	238	}
	239
	240	/**
	241	* asl_urb_enqueue - queue an URB onto the asynchronous list (ASL).
	242	* @whc: the WHCI host controller
	243	* @urb: the URB to enqueue
	244	* @mem_flags: flags for any memory allocations
	245	*
	246	* The qset for the endpoint is obtained and the urb queued on to it.
	247	*
	248	* Work is scheduled to update the hardware's view of the ASL.
	249	*/
	250	int asl_urb_enqueue(struct whc whc, struct urb urb, gfp_t mem_flags)
	251	{
	252	struct whc_qset *qset;
	253	int err;
	254	unsigned long flags;
	255
	256	spin_lock_irqsave(&whc->lock, flags);
	257
f720af91 DV	258	err = usb_hcd_link_urb_to_ep(&whc->wusbhc.usb_hcd, urb);
	259	if (err < 0) {
	260	spin_unlock_irqrestore(&whc->lock, flags);
	261	return err;
	262	}
	263
7e6133aa DV	264	qset = get_qset(whc, urb, GFP_ATOMIC);
	265	if (qset == NULL)
	266	err = -ENOMEM;
	267	else
	268	err = qset_add_urb(whc, qset, urb, GFP_ATOMIC);
	269	if (!err) {
7e6133aa DV	270	if (!qset->in_sw_list)
7e6133aa DV	271	asl_qset_insert_begin(whc, qset);
f720af91 DV	272	} else
f720af91 DV	273	usb_hcd_unlink_urb_from_ep(&whc->wusbhc.usb_hcd, urb);
7e6133aa DV	274
	275	spin_unlock_irqrestore(&whc->lock, flags);
	276
	277	if (!err)
	278	queue_work(whc->workqueue, &whc->async_work);
	279
f720af91	280	return err;
7e6133aa DV	281	}
	282
	283	/**
	284	* asl_urb_dequeue - remove an URB (qset) from the async list.
	285	* @whc: the WHCI host controller
	286	* @urb: the URB to dequeue
	287	* @status: the current status of the URB
	288	*
	289	* URBs that do yet have qTDs can simply be removed from the software
	290	* queue, otherwise the qset must be removed from the ASL so the qTDs
	291	* can be removed.
	292	*/
	293	int asl_urb_dequeue(struct whc whc, struct urb urb, int status)
	294	{
	295	struct whc_urb *wurb = urb->hcpriv;
	296	struct whc_qset *qset = wurb->qset;
	297	struct whc_std std, t;
	298	int ret;
	299	unsigned long flags;
	300
	301	spin_lock_irqsave(&whc->lock, flags);
	302
	303	ret = usb_hcd_check_unlink_urb(&whc->wusbhc.usb_hcd, urb, status);
	304	if (ret < 0)
	305	goto out;
	306
	307	list_for_each_entry_safe(std, t, &qset->stds, list_node) {
	308	if (std->urb == urb)
	309	qset_free_std(whc, std);
	310	else
	311	std->qtd = NULL; /* so this std is re-added when the qset is */
	312	}
	313
	314	asl_qset_remove(whc, qset);
	315	wurb->status = status;
	316	wurb->is_async = true;
	317	queue_work(whc->workqueue, &wurb->dequeue_work);
	318
	319	out:
	320	spin_unlock_irqrestore(&whc->lock, flags);
	321
	322	return ret;
	323	}
	324
	325	/**
	326	* asl_qset_delete - delete a qset from the ASL
	327	*/
	328	void asl_qset_delete(struct whc whc, struct whc_qset qset)
	329	{
	330	qset->remove = 1;
	331	queue_work(whc->workqueue, &whc->async_work);
	332	qset_delete(whc, qset);
	333	}
	334
	335	/**
	336	* asl_init - initialize the asynchronous schedule list
	337	*
	338	* A dummy qset with no qTDs is added to the ASL to simplify removing
	339	* qsets (no need to stop the ASL when the last qset is removed).
	340	*/
	341	int asl_init(struct whc *whc)
	342	{
	343	struct whc_qset *qset;
	344
345	qset = qset_alloc(whc, GFP_KERNEL);
346	if (qset == NULL)
347	return -ENOMEM;
348
349	asl_qset_insert_begin(whc, qset);
350	asl_qset_insert(whc, qset);
351
352	return 0;
353	}
354
355	/**
356	* asl_clean_up - free ASL resources
357	*
358	* The ASL is stopped and empty except for the dummy qset.
359	*/
360	void asl_clean_up(struct whc *whc)
361	{
362	struct whc_qset *qset;
363
364	if (!list_empty(&whc->async_list)) {
365	qset = list_first_entry(&whc->async_list, struct whc_qset, list_node);
366	list_del(&qset->list_node);
367	qset_free(whc, qset);
368	}
369	}