linux-kernel - [PATCH] usb: gadget: net2280: use swap() instead of open coding it

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Date:   Thu,  7 Apr 2022 18:04:52 +0800
From:   Guo Zhengkui <guozhengkui@...o.com>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jakob Koschel <jakobkoschel@...il.com>,
        Guo Zhengkui <guozhengkui@...o.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Colin Ian King <colin.king@...el.com>,
        linux-usb@...r.kernel.org (open list:USB GADGET/PERIPHERAL SUBSYSTEM),
        linux-kernel@...r.kernel.org (open list)
Cc:     zhengkui_guo@...look.com
Subject: [PATCH] usb: gadget: net2280: use swap() instead of open coding it

Address the following coccicheck warning:
drivers/usb/gadget/udc/net2280.c:940:20-21: WARNING opportunity for swap().
drivers/usb/gadget/udc/net2280.c:944:25-26: WARNING opportunity for swap().

by using swap() for the swapping of variable values and drop the tmp
variables (`tmp` and `end`) that are not needed any more.

Signed-off-by: Guo Zhengkui <guozhengkui@...o.com>
---
 drivers/usb/gadget/udc/net2280.c | 14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/gadget/udc/net2280.c b/drivers/usb/gadget/udc/net2280.c
index 051d024b369e..d6a68631354a 100644
--- a/drivers/usb/gadget/udc/net2280.c
+++ b/drivers/usb/gadget/udc/net2280.c
@@ -932,19 +932,11 @@ static void start_dma(struct net2280_ep *ep, struct net2280_request *req)
 static inline void
 queue_dma(struct net2280_ep *ep, struct net2280_request *req, int valid)
 {
-	struct net2280_dma	*end;
-	dma_addr_t		tmp;
-
 	/* swap new dummy for old, link; fill and maybe activate */
-	end = ep->dummy;
-	ep->dummy = req->td;
-	req->td = end;
-
-	tmp = ep->td_dma;
-	ep->td_dma = req->td_dma;
-	req->td_dma = tmp;
+	swap(ep->dummy, req->td);
+	swap(ep->td_dma, req->td_dma);
 
-	end->dmadesc = cpu_to_le32 (ep->td_dma);
+	req->td->dmadesc = cpu_to_le32 (ep->td_dma);
 
 	fill_dma_desc(ep, req, valid);
 }
-- 
2.20.1