linux-kernel - [PATCH] usb: mtu3: cleanup with list_first_entry_or

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Date:   Sun, 21 May 2017 02:05:31 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     linux-usb@...r.kernel.org
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] usb: mtu3: cleanup with list_first_entry_or_null()

The combo of list_empty() and list_first_entry() can be replaced with
list_first_entry_or_null().

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

 drivers/usb/mtu3/mtu3.h | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/mtu3/mtu3.h b/drivers/usb/mtu3/mtu3.h
index aa6fd6a..7b6dc23 100644
--- a/drivers/usb/mtu3/mtu3.h
+++ b/drivers/usb/mtu3/mtu3.h
@@ -356,12 +356,8 @@ static inline struct mtu3_ep *to_mtu3_ep(struct usb_ep *ep)
 
 static inline struct mtu3_request *next_request(struct mtu3_ep *mep)
 {
-	struct list_head *queue = &mep->req_list;
-
-	if (list_empty(queue))
-		return NULL;
-
-	return list_first_entry(queue, struct mtu3_request, list);
+	return list_first_entry_or_null(&mep->req_list, struct mtu3_request,
+					list);
 }
 
 static inline void mtu3_writel(void __iomem *base, u32 offset, u32 data)
-- 
2.7.4