linux-kernel - [PATCH v3 2/6] usb: musb: Introduce musb_qh

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Message-Id: <20200421133019.27167-3-matwey.kornilov@gmail.com>
Date:   Tue, 21 Apr 2020 16:30:15 +0300
From:   matwey.kornilov@...il.com
To:     stern@...land.harvard.edu, Bin Liu <b-liu@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org (open list:MUSB MULTIPOINT HIGH SPEED
        DUAL-ROLE CONTROLLER), linux-kernel@...r.kernel.org (open list)
Cc:     "Matwey V. Kornilov" <matwey@....msu.ru>,
        linux-usb@...r.kernel.org (open list:MUSB MULTIPOINT HIGH SPEED
        DUAL-ROLE CONTROLLER), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v3 2/6] usb: musb: Introduce musb_qh_empty() helper function

From: "Matwey V. Kornilov" <matwey@....msu.ru>

Use musb_qh_empty() instead of &qh->hep->urb_list to avoid code
duplicating.

Signed-off-by: Matwey V. Kornilov <matwey@....msu.ru>
---
 drivers/usb/musb/musb_host.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index b0614c59e0e5..af906f072cb3 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -80,6 +80,11 @@ static void musb_ep_program(struct musb *musb, u8 epnum,
 			struct urb *urb, int is_out,
 			u8 *buf, u32 offset, u32 len);
 
+static bool musb_qh_empty(struct musb_qh *qh)
+{
+	return list_empty(&qh->hep->urb_list);
+}
+
 /*
  * Clear TX fifo. Needed to avoid BABBLE errors.
  */
@@ -324,7 +329,7 @@ static void musb_advance_schedule(struct musb *musb, struct urb *urb,
 	/* reclaim resources (and bandwidth) ASAP; deschedule it, and
 	 * invalidate qh as soon as list_empty(&hep->urb_list)
 	 */
-	if (list_empty(&qh->hep->urb_list)) {
+	if (musb_qh_empty(qh)) {
 		struct list_head	*head;
 		struct dma_controller	*dma = musb->dma_controller;
 
@@ -2397,7 +2402,7 @@ static int musb_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 		/* If nothing else (usually musb_giveback) is using it
 		 * and its URB list has emptied, recycle this qh.
 		 */
-		if (ready && list_empty(&qh->hep->urb_list)) {
+		if (ready && musb_qh_empty(qh)) {
 			qh->hep->hcpriv = NULL;
 			list_del(&qh->ring);
 			kfree(qh);
@@ -2442,7 +2447,7 @@ musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
 		/* Then nuke all the others ... and advance the
 		 * queue on hw_ep (e.g. bulk ring) when we're done.
 		 */
-		while (!list_empty(&hep->urb_list)) {
+		while (!musb_qh_empty(qh)) {
 			urb = next_urb(qh);
 			urb->status = -ESHUTDOWN;
 			musb_advance_schedule(musb, urb, qh->hw_ep, is_in);
@@ -2452,7 +2457,7 @@ musb_h_disable(struct usb_hcd *hcd, struct usb_host_endpoint *hep)
 		 * other transfers, and since !qh->is_ready nothing
 		 * will activate any of these as it advances.
 		 */
-		while (!list_empty(&hep->urb_list))
+		while (!musb_qh_empty(qh))
 			musb_giveback(musb, next_urb(qh), -ESHUTDOWN);
 
 		hep->hcpriv = NULL;
-- 
2.25.0