n_tty: Fix apparent order of echoed output

With block processing of echoed output, observed output order is still
required. Push completed echoes and echo commands prior to output.

Introduce echo_mark echo buffer index, which tracks completed echo
commands; ie., those submitted via commit_echoes but which may not
have been committed. Ensure that completed echoes are output prior
to subsequent terminal writes in process_echoes().

Fixes newline/prompt output order in cooked mode shell.

Cc: <stable@vger.kernel.org> # 3.12.x : 39434ab n_tty: Fix missing newline echo
Reported-by: Karl Dahlke <eklhad@comcast.net>
Reported-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Tested-by: Karl Dahlke <eklhad@comcast.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 268b62768f2b..34aacaaae14a 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -93,6 +93,7 @@ struct n_tty_data {
         size_t canon_head;
         size_t echo_head;
         size_t echo_commit;
+        size_t echo_mark;
         DECLARE_BITMAP(char_map, 256);
 
         /* private to n_tty_receive_overrun (single-threaded) */
@@ -336,6 +337,7 @@ static void reset_buffer_flags(struct n_tty_data *ldata)
 {
         ldata->read_head = ldata->canon_head = ldata->read_tail = 0;
         ldata->echo_head = ldata->echo_tail = ldata->echo_commit = 0;
+        ldata->echo_mark = 0;
         ldata->line_start = 0;
 
         ldata->erasing = 0;
@@ -787,6 +789,7 @@ static void commit_echoes(struct tty_struct *tty)
         size_t head;
 
         head = ldata->echo_head;
+        ldata->echo_mark = head;
         old = ldata->echo_commit - ldata->echo_tail;
 
         /* Process committed echoes if the accumulated # of bytes
@@ -811,10 +814,11 @@ static void process_echoes(struct tty_struct *tty)
         size_t echoed;
 
         if ((!L_ECHO(tty) && !L_ECHONL(tty)) ||
-            ldata->echo_commit == ldata->echo_tail)
+            ldata->echo_mark == ldata->echo_tail)
                 return;
 
         mutex_lock(&ldata->output_lock);
+        ldata->echo_commit = ldata->echo_mark;
         echoed = __process_echoes(tty);
         mutex_unlock(&ldata->output_lock);
 
@@ -822,6 +826,7 @@ static void process_echoes(struct tty_struct *tty)
                 tty->ops->flush_chars(tty);
 }
 
+/* NB: echo_mark and echo_head should be equivalent here */
 static void flush_echoes(struct tty_struct *tty)
 {
         struct n_tty_data *ldata = tty->disc_data;