Arnd Bergmann, le lun. 10 déc. 2018 22:41:50 +0100, a ecrit:
> In this driver, both function the same way, but we want to eventually
> kill off semaphores, so a completion is the better choice here.
> 
> Signed-off-by: Arnd Bergmann <a...@arndb.de>

Reviewed-by: Samuel Thibault <samuel.thiba...@ens-lyon.org>

> ---
>  drivers/staging/speakup/spk_ttyio.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/speakup/spk_ttyio.c 
> b/drivers/staging/speakup/spk_ttyio.c
> index 979e3ae249c1..c92bbd05516e 100644
> --- a/drivers/staging/speakup/spk_ttyio.c
> +++ b/drivers/staging/speakup/spk_ttyio.c
> @@ -10,7 +10,7 @@
>  
>  struct spk_ldisc_data {
>       char buf;
> -     struct semaphore sem;
> +     struct completion completion;
>       bool buf_free;
>  };
>  
> @@ -55,7 +55,7 @@ static int spk_ttyio_ldisc_open(struct tty_struct *tty)
>       if (!ldisc_data)
>               return -ENOMEM;
>  
> -     sema_init(&ldisc_data->sem, 0);
> +     init_completion(&ldisc_data->completion);
>       ldisc_data->buf_free = true;
>       speakup_tty->disc_data = ldisc_data;
>  
> @@ -95,7 +95,7 @@ static int spk_ttyio_receive_buf2(struct tty_struct *tty,
>  
>       ldisc_data->buf = cp[0];
>       ldisc_data->buf_free = false;
> -     up(&ldisc_data->sem);
> +     complete(&ldisc_data->completion);
>  
>       return 1;
>  }
> @@ -286,7 +286,8 @@ static unsigned char ttyio_in(int timeout)
>       struct spk_ldisc_data *ldisc_data = speakup_tty->disc_data;
>       char rv;
>  
> -     if (down_timeout(&ldisc_data->sem, usecs_to_jiffies(timeout)) == 
> -ETIME) {
> +     if (wait_for_completion_timeout(&ldisc_data->completion,
> +                                     usecs_to_jiffies(timeout)) == 0) {
>               if (timeout)
>                       pr_warn("spk_ttyio: timeout (%d)  while waiting for 
> input\n",
>                               timeout);
> -- 
> 2.20.0
> 

-- 
Samuel
Progress (n.): The process through which the Internet has evolved from
smart people in front of dumb terminals to dumb people in front of smart
terminals.
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