On Sat, 2016-04-02 at 19:07 +0200, Grigori Goronzy wrote:
> Use the correct types and sizes.
> 
> Signed-off-by: Grigori Goronzy <g...@chown.ath.cx>
> ---
>  drivers/usb/serial/ch341.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c
> index 25c5d8d..6781911 100644
> --- a/drivers/usb/serial/ch341.c
> +++ b/drivers/usb/serial/ch341.c
> @@ -116,7 +116,7 @@ static int ch341_control_out(struct usb_device *dev, u8 
> request,
>  
>  static int ch341_control_in(struct usb_device *dev,
>                           u8 request, u16 value, u16 index,
> -                         char *buf, unsigned bufsize)
> +                         unsigned char *buf, unsigned bufsize)

If you do that, you can just use u8 *

>  {
>       int r;
>  
> @@ -169,9 +169,9 @@ static int ch341_set_handshake(struct usb_device *dev, u8 
> control)
>  
>  static int ch341_get_status(struct usb_device *dev, struct ch341_private 
> *priv)
>  {
> -     char *buffer;
> +     unsigned char *buffer;
>       int r;
> -     const unsigned size = 8;
> +     const unsigned size = 2;
>       unsigned long flags;
>  
>       buffer = kmalloc(size, GFP_KERNEL);
> @@ -199,9 +199,9 @@ out:      kfree(buffer);
>  
>  static int ch341_configure(struct usb_device *dev, struct ch341_private 
> *priv)
>  {
> -     char *buffer;
> +     unsigned char *buffer;
>       int r;
> -     const unsigned size = 8;
> +     const unsigned size = 2;

Are you sure only 2 are used?
For the amount of space needed it makes no difference.

        Regards
                Oliver

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