linux-kernel - [PATCH] USB: serial: use kmemdup instead of kmalloc + memcpy

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Date:   Mon, 20 Jun 2022 18:59:39 +0800
From:   Slark Xiao <slark_xiao@....com>
To:     johan@...nel.org
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Slark Xiao <slark_xiao@....com>
Subject: [PATCH] USB: serial: use kmemdup instead of kmalloc + memcpy

For code neat purpose, we can use kmemdup to replace
kmalloc + memcpy.

Signed-off-by: Slark Xiao <slark_xiao@....com>
---
 drivers/usb/serial/opticon.c | 4 +---
 drivers/usb/serial/sierra.c  | 4 +---
 2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c
index aed28c35caff..bca6766a63e6 100644
--- a/drivers/usb/serial/opticon.c
+++ b/drivers/usb/serial/opticon.c
@@ -208,7 +208,7 @@ static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port,
 	priv->outstanding_bytes += count;
 	spin_unlock_irqrestore(&priv->lock, flags);
 
-	buffer = kmalloc(count, GFP_ATOMIC);
+	buffer = kmemdup(buf, count, GFP_ATOMIC);
 	if (!buffer)
 		goto error_no_buffer;
 
@@ -216,8 +216,6 @@ static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port,
 	if (!urb)
 		goto error_no_urb;
 
-	memcpy(buffer, buf, count);
-
 	usb_serial_debug_data(&port->dev, __func__, count, buffer);
 
 	/* The connected devices do not have a bulk write endpoint,
diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index 9d56138133a9..865d1237d611 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -453,7 +453,7 @@ static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port,
 		goto error_simple;
 	}
 
-	buffer = kmalloc(writesize, GFP_ATOMIC);
+	buffer = kmemdup(buf, writesize, GFP_ATOMIC);
 	if (!buffer) {
 		retval = -ENOMEM;
 		goto error_no_buffer;
@@ -465,8 +465,6 @@ static int sierra_write(struct tty_struct *tty, struct usb_serial_port *port,
 		goto error_no_urb;
 	}
 
-	memcpy(buffer, buf, writesize);
-
 	usb_serial_debug_data(&port->dev, __func__, writesize, buffer);
 
 	usb_fill_bulk_urb(urb, serial->dev,
-- 
2.25.1