TTY: move TTY_FLUSH* flags to tty_port

They are only TTY buffers specific. And the buffers will go to
tty_port in the next patches. So to remove the need to have both
tty_port and tty_struct at some places, let us move the flags to
tty_port.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 13 insertions, 10 deletions

diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index 8b00f6a34a7d..6f366f257fba 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -134,17 +134,18 @@ static void __tty_buffer_flush(struct tty_struct *tty)
 
 void tty_buffer_flush(struct tty_struct *tty)
 {
+        struct tty_port *port = tty->port;
         unsigned long flags;
         spin_lock_irqsave(&tty->buf.lock, flags);
 
         /* If the data is being pushed to the tty layer then we can't
            process it here. Instead set a flag and the flush_to_ldisc
            path will process the flush request before it exits */
-        if (test_bit(TTY_FLUSHING, &tty->flags)) {
-                set_bit(TTY_FLUSHPENDING, &tty->flags);
+        if (test_bit(TTYP_FLUSHING, &port->iflags)) {
+                set_bit(TTYP_FLUSHPENDING, &port->iflags);
                 spin_unlock_irqrestore(&tty->buf.lock, flags);
                 wait_event(tty->read_wait,
-                                test_bit(TTY_FLUSHPENDING, &tty->flags) == 0);
+                                test_bit(TTYP_FLUSHPENDING, &port->iflags) == 0);
                 return;
         } else
                 __tty_buffer_flush(tty);
@@ -450,6 +451,7 @@ static void flush_to_ldisc(struct work_struct *work)
 {
         struct tty_struct *tty =
                 container_of(work, struct tty_struct, buf.work);
+        struct tty_port *port = tty->port;
         unsigned long   flags;
         struct tty_ldisc *disc;
 
@@ -459,7 +461,7 @@ static void flush_to_ldisc(struct work_struct *work)
 
         spin_lock_irqsave(&tty->buf.lock, flags);
 
-        if (!test_and_set_bit(TTY_FLUSHING, &tty->flags)) {
+        if (!test_and_set_bit(TTYP_FLUSHING, &port->iflags)) {
                 struct tty_buffer *head;
                 while ((head = tty->buf.head) != NULL) {
                         int count;
@@ -477,7 +479,7 @@ static void flush_to_ldisc(struct work_struct *work)
                         /* Ldisc or user is trying to flush the buffers
                            we are feeding to the ldisc, stop feeding the
                            line discipline as we want to empty the queue */
-                        if (test_bit(TTY_FLUSHPENDING, &tty->flags))
+                        if (test_bit(TTYP_FLUSHPENDING, &port->iflags))
                                 break;
                         if (!tty->receive_room)
                                 break;
@@ -491,14 +493,14 @@ static void flush_to_ldisc(struct work_struct *work)
                                                         flag_buf, count);
                         spin_lock_irqsave(&tty->buf.lock, flags);
                 }
-                clear_bit(TTY_FLUSHING, &tty->flags);
+                clear_bit(TTYP_FLUSHING, &port->iflags);
         }
 
         /* We may have a deferred request to flush the input buffer,
            if so pull the chain under the lock and empty the queue */
-        if (test_bit(TTY_FLUSHPENDING, &tty->flags)) {
+        if (test_bit(TTYP_FLUSHPENDING, &port->iflags)) {
                 __tty_buffer_flush(tty);
-                clear_bit(TTY_FLUSHPENDING, &tty->flags);
+                clear_bit(TTYP_FLUSHPENDING, &port->iflags);
                 wake_up(&tty->read_wait);
         }
         spin_unlock_irqrestore(&tty->buf.lock, flags);
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 08787ece3fdc..b4b3c568d242 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -197,6 +197,9 @@ struct tty_port {
         wait_queue_head_t       close_wait;     /* Close waiters */
         wait_queue_head_t       delta_msr_wait; /* Modem status change */
         unsigned long           flags;          /* TTY flags ASY_*/
+        unsigned long           iflags;         /* TTYP_ internal flags */
+#define TTYP_FLUSHING                   1  /* Flushing to ldisc in progress */
+#define TTYP_FLUSHPENDING               2  /* Queued buffer flush pending */
         unsigned char           console:1;      /* port is a console */
         struct mutex            mutex;          /* Locking */
         struct mutex            buf_mutex;      /* Buffer alloc lock */
@@ -309,8 +312,6 @@ struct tty_file_private {
 #define TTY_PTY_LOCK            16      /* pty private */
 #define TTY_NO_WRITE_SPLIT      17      /* Preserve write boundaries to driver */
 #define TTY_HUPPED              18      /* Post driver->hangup() */
-#define TTY_FLUSHING            19      /* Flushing to ldisc in progress */
-#define TTY_FLUSHPENDING        20      /* Queued buffer flush pending */
 #define TTY_HUPPING             21      /* ->hangup() in progress */
 
 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))