n_tty: Factor tty->closing receive_buf() into separate fn

Convert to modal receive_buf() processing; factor receive char
processing when tty->closing into n_tty_receive_buf_closing().

Note that EXTPROC when ISTRIP or IUCLC is set continues to be
handled by n_tty_receive_char().

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 39 insertions, 11 deletions

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index e9cfc77a1279..ed6c4e4d960a 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1276,17 +1276,6 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
                 process_echoes(tty);
         }
 
-        if (tty->closing) {
-                if (I_IXON(tty)) {
-                        if (c == START_CHAR(tty)) {
-                                start_tty(tty);
-                                process_echoes(tty);
-                        } else if (c == STOP_CHAR(tty))
-                                stop_tty(tty);
-                }
-                return;
-        }
-
         /*
          * If the previous character was LNEXT, or we know that this
          * character is not one of the characters that we'll have to
@@ -1463,6 +1452,27 @@ handle_newline:
         put_tty_queue(c, ldata);
 }
 
+static inline void
+n_tty_receive_char_closing(struct tty_struct *tty, unsigned char c)
+{
+        if (I_ISTRIP(tty))
+                c &= 0x7f;
+        if (I_IUCLC(tty) && L_IEXTEN(tty))
+                c = tolower(c);
+
+        if (I_IXON(tty)) {
+                if (c == STOP_CHAR(tty))
+                        stop_tty(tty);
+                else if (c == START_CHAR(tty) ||
+                         (tty->stopped && !tty->flow_stopped && I_IXANY(tty) &&
+                          c != INTR_CHAR(tty) && c != QUIT_CHAR(tty) &&
+                          c != SUSP_CHAR(tty))) {
+                        start_tty(tty);
+                        process_echoes(tty);
+                }
+        }
+}
+
 static void
 n_tty_receive_char_flagged(struct tty_struct *tty, unsigned char c, char flag)
 {
@@ -1542,6 +1552,22 @@ n_tty_receive_buf_raw(struct tty_struct *tty, const unsigned char *cp,
         }
 }
 
+static void
+n_tty_receive_buf_closing(struct tty_struct *tty, const unsigned char *cp,
+                          char *fp, int count)
+{
+        char flag = TTY_NORMAL;
+
+        while (count--) {
+                if (fp)
+                        flag = *fp++;
+                if (likely(flag == TTY_NORMAL))
+                        n_tty_receive_char_closing(tty, *cp++);
+                else
+                        n_tty_receive_char_flagged(tty, *cp++, flag);
+        }
+}
+
 static void __receive_buf(struct tty_struct *tty, const unsigned char *cp,
                           char *fp, int count)
 {
@@ -1552,6 +1578,8 @@ static void __receive_buf(struct tty_struct *tty, const unsigned char *cp,
                 n_tty_receive_buf_real_raw(tty, cp, fp, count);
         else if (ldata->raw || (L_EXTPROC(tty) && !preops))
                 n_tty_receive_buf_raw(tty, cp, fp, count);
+        else if (tty->closing && !L_EXTPROC(tty))
+                n_tty_receive_buf_closing(tty, cp, fp, count);
         else {
                 char flag = TTY_NORMAL;