linux-kernel - [PATCH 02/23] usb: gadget: f_sourcesink: compute req size once

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Date:	Tue, 03 Nov 2015 13:53:41 +0100
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	balbi@...com
Cc:	gregkh@...uxfoundation.org, andrzej.p@...sung.com,
	m.szyprowski@...sung.com, b.zolnierkie@...sung.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Robert Baldyga <r.baldyga@...sung.com>
Subject: [PATCH 02/23] usb: gadget: f_sourcesink: compute req size once

Compute request size once before the loop instead of computing it in each
loop iteration.

Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
---
 drivers/usb/gadget/function/f_sourcesink.c | 45 +++++++++++++++---------------
 1 file changed, 22 insertions(+), 23 deletions(-)

diff --git a/drivers/usb/gadget/function/f_sourcesink.c b/drivers/usb/gadget/function/f_sourcesink.c
index 1d6ec88..a8b68c6 100644
--- a/drivers/usb/gadget/function/f_sourcesink.c
+++ b/drivers/usb/gadget/function/f_sourcesink.c
@@ -591,31 +591,30 @@ static int source_sink_start_ep(struct f_sourcesink *ss, bool is_in,
 {
 	struct usb_ep		*ep;
 	struct usb_request	*req;
-	int			i, size, status;
-
-	for (i = 0; i < 8; i++) {
-		if (is_iso) {
-			switch (speed) {
-			case USB_SPEED_SUPER:
-				size = ss->isoc_maxpacket *
-						(ss->isoc_mult + 1) *
-						(ss->isoc_maxburst + 1);
-				break;
-			case USB_SPEED_HIGH:
-				size = ss->isoc_maxpacket * (ss->isoc_mult + 1);
-				break;
-			default:
-				size = ss->isoc_maxpacket > 1023 ?
-						1023 : ss->isoc_maxpacket;
-				break;
-			}
-			ep = is_in ? ss->iso_in_ep : ss->iso_out_ep;
-			req = ss_alloc_ep_req(ep, size);
-		} else {
-			ep = is_in ? ss->in_ep : ss->out_ep;
-			req = ss_alloc_ep_req(ep, 0);
+	int			i, size = 0, status;
+
+	if (is_iso) {
+		switch (speed) {
+		case USB_SPEED_SUPER:
+			size = ss->isoc_maxpacket *
+				(ss->isoc_mult + 1) *
+				(ss->isoc_maxburst + 1);
+			break;
+		case USB_SPEED_HIGH:
+			size = ss->isoc_maxpacket * (ss->isoc_mult + 1);
+			break;
+		default:
+			size = ss->isoc_maxpacket > 1023 ?
+				1023 : ss->isoc_maxpacket;
+			break;
 		}
+		ep = is_in ? ss->iso_in_ep : ss->iso_out_ep;
+	} else {
+		ep = is_in ? ss->in_ep : ss->out_ep;
+	}
 
+	for (i = 0; i < 8; i++) {
+		req = ss_alloc_ep_req(ep, size);
 		if (!req)
 			return -ENOMEM;
 
-- 
1.9.1

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