usb: renesas_usbhs: shrink spin lock area

spin lock was very effective while doing 1 packet send/recv on
current renesas_usbhs driver.
But this lock is enough only
 - modify packet/pipe link
 - modify interrpt mask
 - modify fifo access
This patch shrink spin lock area
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/renesas_usbhs/common.h

@@ -204,6 +204,10 @@ void usbhs_write(struct usbhs_priv *priv, u32 reg, u16 data);
 void usbhs_bset(struct usbhs_priv *priv, u32 reg, u16 mask, u16 data);
 
 int usbhsc_drvcllbck_notify_hotplug(struct platform_device *pdev);
+
+#define usbhs_lock(p, f) spin_lock_irqsave(usbhs_priv_to_lock(p), f)
+#define usbhs_unlock(p, f) spin_unlock_irqrestore(usbhs_priv_to_lock(p), f)
+
 /*
  * sysconfig
  */

drivers/usb/renesas_usbhs/fifo.c

@@ -22,7 +22,7 @@
 /*
  *		packet info function
  */
-static int usbhsf_null_handle(struct usbhs_pkt *pkt)
+static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
 {
 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
 	struct device *dev = usbhs_priv_to_dev(priv);
@@ -48,6 +48,10 @@ void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
 {
 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 	struct device *dev = usbhs_priv_to_dev(priv);
+	unsigned long flags;
+
+	/********************  spin lock ********************/
+	usbhs_lock(priv, flags);
 
 	if (!handler) {
 		dev_err(dev, "no handler function\n");
@@ -63,14 +67,17 @@ void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
 	pkt->length	= len;
 	pkt->zero	= zero;
 	pkt->actual	= 0;
+
+	usbhs_unlock(priv, flags);
+	/********************  spin unlock ******************/
 }
 
-void usbhs_pkt_pop(struct usbhs_pkt *pkt)
+static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
 {
 	list_del_init(&pkt->node);
 }
 
-struct usbhs_pkt *usbhs_pkt_get(struct usbhs_pipe *pipe)
+static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
 {
 	if (list_empty(&pipe->list))
 		return NULL;
@@ -78,6 +85,71 @@ struct usbhs_pkt *usbhs_pkt_get(struct usbhs_pipe *pipe)
 	return list_entry(pipe->list.next, struct usbhs_pkt, node);
 }
 
+struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
+{
+	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
+	unsigned long flags;
+
+	/********************  spin lock ********************/
+	usbhs_lock(priv, flags);
+
+	if (!pkt)
+		pkt = __usbhsf_pkt_get(pipe);
+
+	if (pkt)
+		__usbhsf_pkt_del(pkt);
+
+	usbhs_unlock(priv, flags);
+	/********************  spin unlock ******************/
+
+	return pkt;
+}
+
+int __usbhs_pkt_handler(struct usbhs_pipe *pipe, int type)
+{
+	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
+	struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
+	struct usbhs_pkt *pkt;
+	struct device *dev = usbhs_priv_to_dev(priv);
+	int (*func)(struct usbhs_pkt *pkt, int *is_done);
+	unsigned long flags;
+	int ret = 0;
+	int is_done = 0;
+
+	/********************  spin lock ********************/
+	usbhs_lock(priv, flags);
+
+	pkt = __usbhsf_pkt_get(pipe);
+	if (!pkt)
+		goto __usbhs_pkt_handler_end;
+
+	switch (type) {
+	case USBHSF_PKT_PREPARE:
+		func = pkt->handler->prepare;
+		break;
+	case USBHSF_PKT_TRY_RUN:
+		func = pkt->handler->try_run;
+		break;
+	default:
+		dev_err(dev, "unknown pkt hander\n");
+		goto __usbhs_pkt_handler_end;
+	}
+
+	ret = func(pkt, &is_done);
+
+	if (is_done)
+		__usbhsf_pkt_del(pkt);
+
+__usbhs_pkt_handler_end:
+	usbhs_unlock(priv, flags);
+	/********************  spin unlock ******************/
+
+	if (is_done)
+		info->done(pkt);
+
+	return ret;
+}
+
 /*
  *		irq enable/disable function
  */
@@ -188,18 +260,17 @@ static int usbhsf_fifo_select(struct usbhs_pipe *pipe, int write)
 /*
  *		PIO fifo functions
  */
-static int usbhsf_try_push(struct usbhs_pkt *pkt)
+static int usbhsf_try_push(struct usbhs_pkt *pkt, int *is_done)
 {
 	struct usbhs_pipe *pipe = pkt->pipe;
 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
-	struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
 	struct device *dev = usbhs_priv_to_dev(priv);
 	void __iomem *addr = priv->base + CFIFO;
 	u8 *buf;
 	int maxp = usbhs_pipe_get_maxpacket(pipe);
 	int total_len;
 	int i, ret, len;
-	int is_short, is_done;
+	int is_short;
 
 	ret = usbhsf_fifo_select(pipe, 1);
 	if (ret < 0)
@@ -240,11 +311,11 @@ static int usbhsf_try_push(struct usbhs_pkt *pkt)
 	pkt->actual += total_len;
 
 	if (pkt->actual < pkt->length)
-		is_done = 0;		/* there are remainder data */
+		*is_done = 0;		/* there are remainder data */
 	else if (is_short)
-		is_done = 1;		/* short packet */
+		*is_done = 1;		/* short packet */
 	else
-		is_done = !pkt->zero;	/* send zero packet ? */
+		*is_done = !pkt->zero;	/* send zero packet ? */
 
 	/*
 	 * pipe/irq handling
@@ -252,21 +323,19 @@ static int usbhsf_try_push(struct usbhs_pkt *pkt)
 	if (is_short)
 		usbhsf_send_terminator(pipe);
 
-	usbhsf_tx_irq_ctrl(pipe, !is_done);
+	usbhsf_tx_irq_ctrl(pipe, !*is_done);
 	usbhs_pipe_enable(pipe);
 
 	dev_dbg(dev, "  send %d (%d/ %d/ %d/ %d)\n",
 		usbhs_pipe_number(pipe),
-		pkt->length, pkt->actual, is_done, pkt->zero);
+		pkt->length, pkt->actual, *is_done, pkt->zero);
 
 	/*
 	 * Transmission end
 	 */
-	if (is_done) {
+	if (*is_done) {
 		if (usbhs_pipe_is_dcp(pipe))
 			usbhs_dcp_control_transfer_done(pipe);
-
-		info->done(pkt);
 	}
 
 	return 0;
@@ -286,7 +355,7 @@ struct usbhs_pkt_handle usbhs_fifo_push_handler = {
 	.try_run = usbhsf_try_push,
 };
 
-static int usbhsf_prepare_pop(struct usbhs_pkt *pkt)
+static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
 {
 	struct usbhs_pipe *pipe = pkt->pipe;
 	int ret;
@@ -304,7 +373,7 @@ static int usbhsf_prepare_pop(struct usbhs_pkt *pkt)
 	return ret;
 }
 
-static int usbhsf_try_pop(struct usbhs_pkt *pkt)
+static int usbhsf_try_pop(struct usbhs_pkt *pkt, int *is_done)
 {
 	struct usbhs_pipe *pipe = pkt->pipe;
 	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
@@ -316,7 +385,6 @@ static int usbhsf_try_pop(struct usbhs_pkt *pkt)
 	int rcv_len, len;
 	int i, ret;
 	int total_len = 0;
-	int is_done = 0;
 
 	ret = usbhsf_fifo_select(pipe, 0);
 	if (ret < 0)
@@ -367,22 +435,16 @@ static int usbhsf_try_pop(struct usbhs_pkt *pkt)
 
 usbhs_fifo_read_end:
 	if ((pkt->actual == pkt->length) ||	/* receive all data */
-	    (total_len < maxp))			/* short packet */
-		is_done = 1;
-
-	dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
-		usbhs_pipe_number(pipe),
-		pkt->length, pkt->actual, is_done, pkt->zero);
-
-	if (is_done) {
-		struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
-
+	    (total_len < maxp)) {		/* short packet */
+		*is_done = 1;
 		usbhsf_rx_irq_ctrl(pipe, 0);
 		usbhs_pipe_disable(pipe);
-
-		info->done(pkt);
 	}
 
+	dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
+		usbhs_pipe_number(pipe),
+		pkt->length, pkt->actual, *is_done, pkt->zero);
+
 	return 0;
 }
 
@@ -394,15 +456,11 @@ struct usbhs_pkt_handle usbhs_fifo_pop_handler = {
 /*
  *		handler function
  */
-static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt)
+static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
 {
-	struct usbhs_pipe *pipe = pkt->pipe;
-	struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
-	struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
-
-	usbhs_dcp_control_transfer_done(pipe);
+	usbhs_dcp_control_transfer_done(pkt->pipe);
 
-	info->done(pkt);
+	*is_done = 1;
 
 	return 0;
 }
@@ -419,7 +477,6 @@ static int usbhsf_irq_empty(struct usbhs_priv *priv,
 			    struct usbhs_irq_state *irq_state)
 {
 	struct usbhs_pipe *pipe;
-	struct usbhs_pkt *pkt;
 	struct device *dev = usbhs_priv_to_dev(priv);
 	int i, ret;
 
@@ -438,8 +495,7 @@ static int usbhsf_irq_empty(struct usbhs_priv *priv,
 		if (!(irq_state->bempsts & (1 << i)))
 			continue;
 
-		pkt = usbhs_pkt_get(pipe);
-		ret = usbhs_pkt_run(pkt);
+		ret = usbhs_pkt_run(pipe);
 		if (ret < 0)
 			dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
 	}
@@ -451,7 +507,6 @@ static int usbhsf_irq_ready(struct usbhs_priv *priv,
 			    struct usbhs_irq_state *irq_state)
 {
 	struct usbhs_pipe *pipe;
-	struct usbhs_pkt *pkt;
 	struct device *dev = usbhs_priv_to_dev(priv);
 	int i, ret;
 
@@ -470,8 +525,7 @@ static int usbhsf_irq_ready(struct usbhs_priv *priv,
 		if (!(irq_state->brdysts & (1 << i)))
 			continue;
 
-		pkt = usbhs_pkt_get(pipe);
-		ret = usbhs_pkt_run(pkt);
+		ret = usbhs_pkt_run(pipe);
 		if (ret < 0)
 			dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
 	}

drivers/usb/renesas_usbhs/fifo.h

@@ -31,8 +31,8 @@ struct usbhs_pkt {
 };
 
 struct usbhs_pkt_handle {
-	int (*prepare)(struct usbhs_pkt *pkt);
-	int (*try_run)(struct usbhs_pkt *pkt);
+	int (*prepare)(struct usbhs_pkt *pkt, int *is_done);
+	int (*try_run)(struct usbhs_pkt *pkt, int *is_done);
 };
 
 /*
@@ -44,6 +44,11 @@ void usbhs_fifo_quit(struct usbhs_priv *priv);
 /*
  * packet info
  */
+enum {
+	USBHSF_PKT_PREPARE,
+	USBHSF_PKT_TRY_RUN,
+};
+
 extern struct usbhs_pkt_handle usbhs_fifo_push_handler;
 extern struct usbhs_pkt_handle usbhs_fifo_pop_handler;
 extern struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler;
@@ -52,10 +57,10 @@ void usbhs_pkt_init(struct usbhs_pkt *pkt);
 void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
 		    struct usbhs_pkt_handle *handler,
 		    void *buf, int len, int zero);
-void usbhs_pkt_pop(struct usbhs_pkt *pkt);
-struct usbhs_pkt *usbhs_pkt_get(struct usbhs_pipe *pipe);
+struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt);
+int __usbhs_pkt_handler(struct usbhs_pipe *pipe, int type);
 
-#define usbhs_pkt_start(p)	((p)->handler->prepare(p))
-#define usbhs_pkt_run(p)	((p)->handler->try_run(p))
+#define usbhs_pkt_start(p)	__usbhs_pkt_handler(p, USBHSF_PKT_PREPARE)
+#define usbhs_pkt_run(p)	__usbhs_pkt_handler(p, USBHSF_PKT_TRY_RUN)
 
 #endif /* RENESAS_USB_FIFO_H */

drivers/usb/renesas_usbhs/mod_gadget.c

@@ -92,7 +92,6 @@ struct usbhsg_recip_handle {
 	container_of(r, struct usbhsg_request, req)
 
 #define usbhsg_ep_to_uep(e)		container_of(e, struct usbhsg_uep, ep)
-#define usbhsg_gpriv_to_lock(gp)	usbhs_priv_to_lock((gp)->mod.priv)
 #define usbhsg_gpriv_to_dev(gp)		usbhs_priv_to_dev((gp)->mod.priv)
 #define usbhsg_gpriv_to_priv(gp)	((gp)->mod.priv)
 #define usbhsg_gpriv_to_dcp(gp)		((gp)->uep)
@@ -114,35 +113,6 @@ struct usbhsg_recip_handle {
 #define usbhsg_status_clr(gp, b) (gp->status &= ~b)
 #define usbhsg_status_has(gp, b) (gp->status &   b)
 
-/*
- *		usbhsg_trylock
- *
- * This driver don't use spin_try_lock
- * to avoid warning of CONFIG_DEBUG_SPINLOCK
- */
-static spinlock_t *usbhsg_trylock(struct usbhsg_gpriv *gpriv,
-				  unsigned long *flags)
-{
-	spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv);
-
-	/* check spin lock status
-	 * to avoid deadlock/nest */
-	if (spin_is_locked(lock))
-		return NULL;
-
-	spin_lock_irqsave(lock, *flags);
-
-	return lock;
-}
-
-static void usbhsg_unlock(spinlock_t *lock, unsigned long *flags)
-{
-	if (!lock)
-		return;
-
-	spin_unlock_irqrestore(lock, *flags);
-}
-
 /*
  *		list push/pop
  */
@@ -155,9 +125,6 @@ static void usbhsg_queue_push(struct usbhsg_uep *uep,
 	struct usbhs_pkt *pkt = usbhsg_ureq_to_pkt(ureq);
 	struct usb_request *req = &ureq->req;
 
-	/*
-	 *********  assume under spin lock  *********
-	 */
 	usbhs_pkt_push(pipe, pkt, uep->handler,
 		       req->buf, req->length, req->zero);
 	req->actual = 0;
@@ -168,44 +135,11 @@ static void usbhsg_queue_push(struct usbhsg_uep *uep,
 		req->length);
 }
 
-static int usbhsg_queue_start(struct usbhsg_uep *uep)
+static void usbhsg_queue_start(struct usbhsg_uep *uep)
 {
-	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
-	struct usbhs_pkt *pkt;
-	spinlock_t *lock;
-	unsigned long flags;
-	int ret = 0;
 
-	/*
-	 * CAUTION [*queue handler*]
-	 *
-	 * This function will be called for start/restart queue operation.
-	 * OTOH the most much worry for USB driver is spinlock nest.
-	 * Specially it are
-	 *   - usb_ep_ops  :: queue
-	 *   - usb_request :: complete
-	 *
-	 * But the caller of this function need not care about spinlock.
-	 * This function is using usbhsg_trylock for it.
-	 * if "is_locked" is 1, this mean this function lock it.
-	 * but if it is 0, this mean it is already under spin lock.
-	 * see also
-	 *   CAUTION [*endpoint queue*]
-	 *   CAUTION [*request complete*]
-	 */
-
-	/******************  spin try lock *******************/
-	lock = usbhsg_trylock(gpriv, &flags);
-
-	pkt = usbhs_pkt_get(pipe);
-	if (pkt)
-		ret = usbhs_pkt_start(pkt);
-
-	usbhsg_unlock(lock, &flags);
-	/********************  spin unlock ******************/
-
-	return ret;
+	usbhs_pkt_start(pipe);
 }
 
 static void usbhsg_queue_pop(struct usbhsg_uep *uep,
@@ -215,34 +149,9 @@ static void usbhsg_queue_pop(struct usbhsg_uep *uep,
 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
-	struct usbhs_pkt *pkt = usbhsg_ureq_to_pkt(ureq);
-
-	/*
-	 *********  assume under spin lock  *********
-	 */
-
-	/*
-	 * CAUTION [*request complete*]
-	 *
-	 * There is a possibility not to be called in correct order
-	 * if "complete" is called without spinlock.
-	 *
-	 * So, this function assume it is under spinlock,
-	 * and call usb_request :: complete.
-	 *
-	 * But this "complete" will push next usb_request.
-	 * It mean "usb_ep_ops :: queue" which is using spinlock is called
-	 * under spinlock.
-	 *
-	 * To avoid dead-lock, this driver is using usbhsg_trylock.
-	 *   CAUTION [*endpoint queue*]
-	 *   CAUTION [*queue handler*]
-	 */
 
 	dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe));
 
-	usbhs_pkt_pop(pkt);
-
 	ureq->req.status = status;
 	ureq->req.complete(&uep->ep, &ureq->req);
 
@@ -293,8 +202,6 @@ static int usbhsg_recip_handler_std_clear_endpoint(struct usbhs_priv *priv,
 
 	usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
 
-	usbhsg_queue_start(uep);
-
 	return 0;
 }
 
@@ -325,7 +232,8 @@ static int usbhsg_recip_run_handle(struct usbhs_priv *priv,
 	uep = usbhsg_gpriv_to_nth_uep(gpriv, nth);
 	if (!usbhsg_uep_to_pipe(uep)) {
 		dev_err(dev, "wrong recip request\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto usbhsg_recip_run_handle_end;
 	}
 
 	switch (recip) {
@@ -348,10 +256,20 @@ static int usbhsg_recip_run_handle(struct usbhs_priv *priv,
 	}
 
 	if (func) {
+		unsigned long flags;
+
 		dev_dbg(dev, "%s (pipe %d :%s)\n", handler->name, nth, msg);
+
+		/********************  spin lock ********************/
+		usbhs_lock(priv, flags);
 		ret = func(priv, uep, ctrl);
+		usbhs_unlock(priv, flags);
+		/********************  spin unlock ******************/
 	}
 
+usbhsg_recip_run_handle_end:
+	usbhsg_queue_start(uep);
+
 	return ret;
 }
 
@@ -445,44 +363,17 @@ static int usbhsg_irq_ctrl_stage(struct usbhs_priv *priv,
  *		usb_dcp_ops
  *
  */
-static int usbhsg_dcp_enable(struct usbhsg_uep *uep)
-{
-	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
-	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
-	struct usbhs_pipe *pipe;
-
-	/*
-	 *********  assume under spin lock  *********
-	 */
-
-	pipe = usbhs_dcp_malloc(priv);
-	if (!pipe)
-		return -EIO;
-
-	uep->pipe		= pipe;
-	uep->pipe->mod_private	= uep;
-
-	return 0;
-}
-
-#define usbhsg_dcp_disable usbhsg_pipe_disable
 static int usbhsg_pipe_disable(struct usbhsg_uep *uep)
 {
 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 	struct usbhs_pkt *pkt;
 
-	/*
-	 *********  assume under spin lock  *********
-	 */
-
 	usbhs_pipe_disable(pipe);
 
 	while (1) {
-		pkt = usbhs_pkt_get(pipe);
+		pkt = usbhs_pkt_pop(pipe, NULL);
 		if (!pkt)
 			break;
-
-		usbhs_pkt_pop(pkt);
 	}
 
 	return 0;
@@ -509,8 +400,6 @@ static int usbhsg_ep_enable(struct usb_ep *ep,
 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 	struct usbhs_pipe *pipe;
-	spinlock_t *lock;
-	unsigned long flags;
 	int ret = -EIO;
 
 	/*
@@ -520,9 +409,6 @@ static int usbhsg_ep_enable(struct usb_ep *ep,
 	if (uep->pipe)
 		return 0;
 
-	/********************  spin lock ********************/
-	lock = usbhsg_trylock(gpriv, &flags);
-
 	pipe = usbhs_pipe_malloc(priv, desc);
 	if (pipe) {
 		uep->pipe		= pipe;
@@ -536,29 +422,14 @@ static int usbhsg_ep_enable(struct usb_ep *ep,
 		ret = 0;
 	}
 
-	usbhsg_unlock(lock, &flags);
-	/********************  spin unlock ******************/
-
 	return ret;
 }
 
 static int usbhsg_ep_disable(struct usb_ep *ep)
 {
 	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
-	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
-	spinlock_t *lock;
-	unsigned long flags;
-	int ret;
-
-	/********************  spin lock ********************/
-	lock = usbhsg_trylock(gpriv, &flags);
-
-	ret = usbhsg_pipe_disable(uep);
 
-	usbhsg_unlock(lock, &flags);
-	/********************  spin unlock ******************/
-
-	return ret;
+	return usbhsg_pipe_disable(uep);
 }
 
 static struct usb_request *usbhsg_ep_alloc_request(struct usb_ep *ep,
@@ -591,69 +462,28 @@ static int usbhsg_ep_queue(struct usb_ep *ep, struct usb_request *req,
 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
 	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
-	spinlock_t *lock;
-	unsigned long flags;
-	int ret = 0;
-
-	/*
-	 * CAUTION [*endpoint queue*]
-	 *
-	 * This function will be called from usb_request :: complete
-	 * or usb driver timing.
-	 * If this function is called from usb_request :: complete,
-	 * it is already under spinlock on this driver.
-	 * but it is called frm usb driver, this function should call spinlock.
-	 *
-	 * This function is using usbshg_trylock to solve this issue.
-	 * if "is_locked" is 1, this mean this function lock it.
-	 * but if it is 0, this mean it is already under spin lock.
-	 * see also
-	 *   CAUTION [*queue handler*]
-	 *   CAUTION [*request complete*]
-	 */
-
-	/********************  spin lock ********************/
-	lock = usbhsg_trylock(gpriv, &flags);
 
 	/* param check */
 	if (usbhsg_is_not_connected(gpriv)	||
 	    unlikely(!gpriv->driver)		||
 	    unlikely(!pipe))
-		ret = -ESHUTDOWN;
-	else
-		usbhsg_queue_push(uep, ureq);
-
-	usbhsg_unlock(lock, &flags);
-	/********************  spin unlock ******************/
+		return -ESHUTDOWN;
 
+	usbhsg_queue_push(uep, ureq);
 	usbhsg_queue_start(uep);
 
-	return ret;
+	return 0;
 }
 
 static int usbhsg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
 {
 	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
-	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
-	spinlock_t *lock;
-	unsigned long flags;
-
-	/*
-	 * see
-	 *   CAUTION [*queue handler*]
-	 *   CAUTION [*endpoint queue*]
-	 *   CAUTION [*request complete*]
-	 */
-
-	/********************  spin lock ********************/
-	lock = usbhsg_trylock(gpriv, &flags);
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 
+	usbhs_pkt_pop(pipe, usbhsg_ureq_to_pkt(ureq));
 	usbhsg_queue_pop(uep, ureq, -ECONNRESET);
 
-	usbhsg_unlock(lock, &flags);
-	/********************  spin unlock ******************/
-
 	return 0;
 }
 
@@ -662,25 +492,18 @@ static int __usbhsg_ep_set_halt_wedge(struct usb_ep *ep, int halt, int wedge)
 	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
 	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
 	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
+	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
 	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
-	spinlock_t *lock;
 	unsigned long flags;
-	int ret = -EAGAIN;
-
-	/*
-	 * see
-	 *   CAUTION [*queue handler*]
-	 *   CAUTION [*endpoint queue*]
-	 *   CAUTION [*request complete*]
-	 */
 
-	/********************  spin lock ********************/
-	lock = usbhsg_trylock(gpriv, &flags);
-	if (!usbhs_pkt_get(pipe)) {
+	usbhsg_pipe_disable(uep);
 
 	dev_dbg(dev, "set halt %d (pipe %d)\n",
 		halt, usbhs_pipe_number(pipe));
 
+	/********************  spin lock ********************/
+	usbhs_lock(priv, flags);
+
 	if (halt)
 		usbhs_pipe_stall(pipe);
 	else
@@ -691,13 +514,10 @@ static int __usbhsg_ep_set_halt_wedge(struct usb_ep *ep, int halt, int wedge)
 	else
 		usbhsg_status_clr(gpriv, USBHSG_STATUS_WEDGE);
 
-		ret = 0;
-	}
-
-	usbhsg_unlock(lock, &flags);
+	usbhs_unlock(priv, flags);
 	/********************  spin unlock ******************/
 
-	return ret;
+	return 0;
 }
 
 static int usbhsg_ep_set_halt(struct usb_ep *ep, int value)
@@ -733,20 +553,26 @@ static int usbhsg_try_start(struct usbhs_priv *priv, u32 status)
 	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 	struct device *dev = usbhs_priv_to_dev(priv);
-	spinlock_t *lock;
 	unsigned long flags;
+	int ret = 0;
 
 	/********************  spin lock ********************/
-	lock = usbhsg_trylock(gpriv, &flags);
+	usbhs_lock(priv, flags);
 
-	/*
-	 * enable interrupt and systems if ready
-	 */
 	usbhsg_status_set(gpriv, status);
 	if (!(usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
 	      usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD)))
-		goto usbhsg_try_start_unlock;
+		ret = -1; /* not ready */
 
+	usbhs_unlock(priv, flags);
+	/********************  spin unlock ********************/
+
+	if (ret < 0)
+		return 0; /* not ready is not error */
+
+	/*
+	 * enable interrupt and systems if ready
+	 */
 	dev_dbg(dev, "start gadget\n");
 
 	/*
@@ -756,7 +582,10 @@ static int usbhsg_try_start(struct usbhs_priv *priv, u32 status)
 			usbhsg_queue_done);
 	usbhs_fifo_init(priv);
 	usbhsg_uep_init(gpriv);
-	usbhsg_dcp_enable(dcp);
+
+	/* dcp init */
+	dcp->pipe		= usbhs_dcp_malloc(priv);
+	dcp->pipe->mod_private	= dcp;
 
 	/*
 	 * system config enble
@@ -775,10 +604,6 @@ static int usbhsg_try_start(struct usbhs_priv *priv, u32 status)
 	mod->irq_ctrl_stage	= usbhsg_irq_ctrl_stage;
 	usbhs_irq_callback_update(priv, mod);
 
-usbhsg_try_start_unlock:
-	usbhsg_unlock(lock, &flags);
-	/********************  spin unlock ********************/
-
 	return 0;
 }
 
@@ -788,20 +613,26 @@ static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
 	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
 	struct device *dev = usbhs_priv_to_dev(priv);
-	spinlock_t *lock;
 	unsigned long flags;
+	int ret = 0;
 
 	/********************  spin lock ********************/
-	lock = usbhsg_trylock(gpriv, &flags);
+	usbhs_lock(priv, flags);
 
-	/*
-	 * disable interrupt and systems if 1st try
-	 */
 	usbhsg_status_clr(gpriv, status);
 	if (!usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
 	    !usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD))
-		goto usbhsg_try_stop_unlock;
+		ret = -1; /* already done */
 
+	usbhs_unlock(priv, flags);
+	/********************  spin unlock ********************/
+
+	if (ret < 0)
+		return 0; /* already done is not error */
+
+	/*
+	 * disable interrupt and systems if 1st try
+	 */
 	usbhs_fifo_quit(priv);
 
 	/* disable all irq */
@@ -809,8 +640,6 @@ static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
 	mod->irq_ctrl_stage	= NULL;
 	usbhs_irq_callback_update(priv, mod);
 
-	usbhsg_dcp_disable(dcp);
-
 	gpriv->gadget.speed = USB_SPEED_UNKNOWN;
 
 	/* disable sys */
@@ -818,8 +647,7 @@ static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
 	usbhs_sys_function_ctrl(priv, 0);
 	usbhs_sys_usb_ctrl(priv, 0);
 
-	usbhsg_unlock(lock, &flags);
-	/********************  spin unlock ********************/
+	usbhsg_pipe_disable(dcp);
 
 	if (gpriv->driver &&
 	    gpriv->driver->disconnect)
@@ -827,11 +655,6 @@ static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
 
 	dev_dbg(dev, "stop gadget\n");
 
-	return 0;
-
-usbhsg_try_stop_unlock:
-	usbhsg_unlock(lock, &flags);
-
 	return 0;
 }