On Wed, Sep 25, 2013 at 07:08:54PM -0400, Lidza Louina wrote:
> This patch removes this smatch warning:
> unsigned '--un->un_open_count' is never less than zero
>
> The code decremented the un_open_count variable
> and tested to see if it was less than zero. Because
> un_open_count is unsigned and can't be below zero,
> this test didn't work.
>
> Signed-off-by: Lidza Louina <lidza.lou...@gmail.com>
> ---
> drivers/staging/dgap/dgap_tty.c | 8 +++-----
> 1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/staging/dgap/dgap_tty.c b/drivers/staging/dgap/dgap_tty.c
> index 3e12ddb..c0258db 100644
> --- a/drivers/staging/dgap/dgap_tty.c
> +++ b/drivers/staging/dgap/dgap_tty.c
> @@ -1446,13 +1446,11 @@ static void dgap_tty_close(struct tty_struct *tty,
> struct file *file)
> APR(("tty->count is 1, un open count is %d\n",
> un->un_open_count));
> un->un_open_count = 1;
> }
> -
> - if (--un->un_open_count < 0) {
> + if (un->un_open_count == 0) {
> APR(("bad serial port open count of %d\n", un->un_open_count));
> - un->un_open_count = 0;
> + un->un_open_count = 1;
> }
> -
> - ch->ch_open_count--;
Wait? Don't delete this line. We need to decrement both.
> + un->un_open_count--;
regards,
dan carpenter
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