linux-kernel - [PATCH -next v2] usb: gadget: function: printer: use list_move instead of list_del/list

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Message-ID: <20210609070612.1325044-1-libaokun1@huawei.com>
Date:   Wed, 9 Jun 2021 15:06:12 +0800
From:   Baokun Li <libaokun1@...wei.com>
To:     <linux-kernel@...r.kernel.org>, Felipe Balbi <balbi@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Zqiang <qiang.zhang@...driver.com>,
        Wei Ming Chen <jj251510319013@...il.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Michael R Sweet <msweet@...eet.org>
CC:     <weiyongjun1@...wei.com>, <yuehaibing@...wei.com>,
        <yangjihong1@...wei.com>, <yukuai3@...wei.com>,
        <libaokun1@...wei.com>, <linux-usb@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>, Hulk Robot <hulkci@...wei.com>
Subject: [PATCH -next v2] usb: gadget: function: printer: use list_move instead of list_del/list_add

Using list_move() instead of list_del() + list_add().

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Baokun Li <libaokun1@...wei.com>
---
V1->V2:
	CC mailist

 drivers/usb/gadget/function/f_printer.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/function/f_printer.c b/drivers/usb/gadget/function/f_printer.c
index f47fdc1fa7f1..b5112f6974f2 100644
--- a/drivers/usb/gadget/function/f_printer.c
+++ b/drivers/usb/gadget/function/f_printer.c
@@ -667,8 +667,7 @@ printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 		value = usb_ep_queue(dev->in_ep, req, GFP_ATOMIC);
 		spin_lock(&dev->lock);
 		if (value) {
-			list_del(&req->list);
-			list_add(&req->list, &dev->tx_reqs);
+			list_move(&req->list, &dev->tx_reqs);
 			spin_unlock_irqrestore(&dev->lock, flags);
 			mutex_unlock(&dev->lock_printer_io);
 			return -EAGAIN;