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tty: n_tty: simplify process_output()

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Using guard(mutex), the function can be written in a much more efficient
way.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20250317070046.24386-7-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby (SUSE) 2025-03-17 08:00:21 +01:00 committed by Greg Kroah-Hartman
parent d97aa06667
commit fdfa49a8c9
1 changed files with 4 additions and 10 deletions
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14
drivers/tty/n_tty.c
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@ -488,19 +488,13 @@ static int do_output_char(u8 c, struct tty_struct *tty, int space)
static int process_output(u8 c, struct tty_struct *tty)
{
struct n_tty_data *ldata = tty->disc_data;
unsigned int space;
int retval;
mutex_lock(&ldata->output_lock);
guard(mutex)(&ldata->output_lock);
space = tty_write_room(tty);
retval = do_output_char(c, tty, space);
mutex_unlock(&ldata->output_lock);
if (retval < 0)
if (do_output_char(c, tty, tty_write_room(tty)) < 0)
return -1;
else
return 0;
return 0;
}
/**