From: Felipe Balbi <balbi@ti.com>
Date: Mon, 6 Feb 2012 11:40:17 +0000 (+0200)
Subject: usb: dwc3: gadget: avoid memcpy()ing event buffer
X-Git-Tag: v3.4-rc1~184^2~22^2~35^2~17
X-Git-Url: http://git.cascardo.eti.br/?a=commitdiff_plain;h=d70d84423cbc5d6d929640189cf204e693024309;p=cascardo%2Flinux.git

usb: dwc3: gadget: avoid memcpy()ing event buffer

We're only using the 4 byte events and memcpy()
will make us slower. We can easily avoid that.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 2c4482f13a12..1f64e7c1c34f 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2223,7 +2223,8 @@ static irqreturn_t dwc3_process_event_buf(struct dwc3 *dwc, u32 buf)
 	while (left > 0) {
 		union dwc3_event event;
 
-		memcpy(&event.raw, (evt->buf + evt->lpos), sizeof(event.raw));
+		event.raw = *(u32 *) (evt->buf + evt->lpos);
+
 		dwc3_process_event_entry(dwc, &event);
 		/*
 		 * XXX we wrap around correctly to the next entry as almost all