linux-kernel - Re: [PATCH 34/36] tty: gdm724x: convert counts to size

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Date:   Thu, 10 Aug 2023 12:42:47 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
Cc:     gregkh@...uxfoundation.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev
Subject: Re: [PATCH 34/36] tty: gdm724x: convert counts to size_t

On Thu, Aug 10, 2023 at 11:15:08AM +0200, Jiri Slaby (SUSE) wrote:
> Unify the type of tty_operations::write() counters with the 'count'
> parameter. I.e. use size_t for them.
> 
> This includes changing constants to UL to keep min() and avoid min_t().
> 
> Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
> Cc: linux-staging@...ts.linux.dev
> ---
>  drivers/staging/gdm724x/gdm_tty.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/gdm724x/gdm_tty.c b/drivers/staging/gdm724x/gdm_tty.c
> index b31f2afb0286..cbaaa8fa7474 100644
> --- a/drivers/staging/gdm724x/gdm_tty.c
> +++ b/drivers/staging/gdm724x/gdm_tty.c
> @@ -17,9 +17,9 @@
>  #define GDM_TTY_MAJOR 0
>  #define GDM_TTY_MINOR 32
>  
> -#define WRITE_SIZE 2048
> +#define WRITE_SIZE 2048UL
>  
> -#define MUX_TX_MAX_SIZE 2048
> +#define MUX_TX_MAX_SIZE 2048UL
>  
>  static inline bool gdm_tty_ready(struct gdm *gdm)
>  {
> @@ -152,9 +152,8 @@ static void gdm_tty_send_complete(void *arg)
>  static ssize_t gdm_tty_write(struct tty_struct *tty, const u8 *buf, size_t len)
>  {
>  	struct gdm *gdm = tty->driver_data;
> -	int remain = len;
> -	int sent_len = 0;
> -	int sending_len = 0;
> +	size_t remain = len;

We later check if remain <= 0.  It still works because remain could
never be negative, but now it's even less necessary to check for
negatives, I guess.

regards,
dan carpenter