n_tty: Output bells immediately on a full buffer

This patch causes "bell" (^G) characters (invoked when the input buffer
is full) to be immediately output rather than filling the echo buffer.

This is especially a problem when the tty is stopped and buffers fill, since
the bells do not serve their purpose of immediate notification that the
buffer cannot take further input, and they will flush all at once when the
tty is restarted.

Signed-off-by: Joe Peterson <joe@skyrush.com>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index 4b1e96b65ab00b6ae4d5d913d5309bd0ed3283fd..3922a084205e088fc1d43e0bfa357fa4847d4832 100644 (file)
--- a/drivers/char/n_tty.c
+++ b/drivers/char/n_tty.c
@@ -872,7 +872,7 @@ static void eraser(unsigned char c, struct tty_struct *tty)
 
        /* FIXME: locking needed ? */
        if (tty->read_head == tty->canon_head) {
-               /* echo_char_raw('\a', tty); */ /* what do you think? */
+               /* process_output('\a', tty); */ /* what do you think? */
                return;
        }
        if (c == ERASE_CHAR(tty))
@@ -1148,10 +1148,8 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
                parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0;
                if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk - 1)) {
                        /* beep if no space */
-                       if (L_ECHO(tty)) {
-                               echo_char_raw('\a', tty);
-                               process_echoes(tty);
-                       }
+                       if (L_ECHO(tty))
+                               process_output('\a', tty);
                        return;
                }
                if (L_ECHO(tty)) {
@@ -1255,10 +1253,8 @@ send_signal:
                }
                if (c == '\n') {
                        if (tty->read_cnt >= N_TTY_BUF_SIZE) {
-                               if (L_ECHO(tty)) {
-                                       echo_char_raw('\a', tty);
-                                       process_echoes(tty);
-                               }
+                               if (L_ECHO(tty))
+                                       process_output('\a', tty);
                                return;
                        }
                        if (L_ECHO(tty) || L_ECHONL(tty)) {
@@ -1280,10 +1276,8 @@ send_signal:
                        parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty))
                                 ? 1 : 0;
                        if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk)) {
-                               if (L_ECHO(tty)) {
-                                       echo_char_raw('\a', tty);
-                                       process_echoes(tty);
-                               }
+                               if (L_ECHO(tty))
+                                       process_output('\a', tty);
                                return;
                        }
                        /*
@@ -1320,10 +1314,8 @@ handle_newline:
        parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0;
        if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk - 1)) {
                /* beep if no space */
-               if (L_ECHO(tty)) {
-                       echo_char_raw('\a', tty);
-                       process_echoes(tty);
-               }
+               if (L_ECHO(tty))
+                       process_output('\a', tty);
                return;
        }
        if (L_ECHO(tty)) {