Re:Re: [PATCH] USB: serial: use kmemdup instead of kmalloc + memcpy

[Slark Xiao]

At 2022-06-20 21:10:49, "Johan Hovold" <johan@xxxxxxxxxx> wrote:
>On Mon, Jun 20, 2022 at 06:59:39PM +0800, Slark Xiao wrote:
>> For code neat purpose, we can use kmemdup to replace
>> kmalloc + memcpy.
>> 
>> Signed-off-by: Slark Xiao <slark_xiao@xxxxxxx>
>> ---
>>  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,
>
>Looks like we have the same pattern also in garmin_write_bulk(). Care to
>include that one as well?
>
>Johan
Ok, I will add it into the patch as well in V2.