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tty: Remove chars_in_buffer() line discipline method

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The chars_in_buffer() line discipline method serves no functional
purpose, other than as a (dubious) debugging aid for mostly bit-rotting
drivers. Despite being documented as an optional method, every caller
is unconditionally executed (although conditionally compiled).
Furthermore, direct tty->ldisc access without an ldisc ref is unsafe.
Lastly, N_TTY's chars_in_buffer() has warned of removal since 3.12.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley
2016-01-10 22:40:54 -08:00
committed by Greg Kroah-Hartman
parent 582e20a03b
commit fdfb719e93
8 changed files with 13 additions and 68 deletions
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8
drivers/tty/cyclades.c
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@@ -2852,8 +2852,8 @@ static void cy_throttle(struct tty_struct *tty)
unsigned long flags;
#ifdef CY_DEBUG_THROTTLE
printk(KERN_DEBUG "cyc:throttle %s: %ld...ttyC%d\n", tty_name(tty),
tty->ldisc.chars_in_buffer(tty), info->line);
printk(KERN_DEBUG "cyc:throttle %s ...ttyC%d\n", tty_name(tty),
info->line);
#endif
if (serial_paranoia_check(info, tty->name, "cy_throttle"))
@@ -2891,8 +2891,8 @@ static void cy_unthrottle(struct tty_struct *tty)
unsigned long flags;
#ifdef CY_DEBUG_THROTTLE
printk(KERN_DEBUG "cyc:unthrottle %s: %ld...ttyC%d\n",
tty_name(tty), tty_chars_in_buffer(tty), info->line);
printk(KERN_DEBUG "cyc:unthrottle %s ...ttyC%d\n",
tty_name(tty), info->line);
#endif
if (serial_paranoia_check(info, tty->name, "cy_unthrottle"))