tty/serial: lay the foundations for the next set of reworks

- Stop drivers calling their own flush method indirectly, it obfuscates code
  and it will change soon anyway

- A few more lock_kernel paths temporarily needed in some driver internal
  waiting code

- Remove private put_char method that does a write call for one char - we
  have that anyway

- Most but not yet all of the termios copy under lock fixing (some has other
  dependencies to follow)

- Note a few locking bugs in drivers found in the process

- Kill remaining [ab]users of TIOCG/SSOFTCAR in the driver, these must go to
  fix the termios locking

Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/char/esp.c b/drivers/char/esp.c
index 662e9cfdcc96..b1f92db31331 100644
--- a/drivers/char/esp.c
+++ b/drivers/char/esp.c
@@ -1994,8 +1994,7 @@ static void rs_close(struct tty_struct *tty, struct file * filp)
                 rs_wait_until_sent(tty, info->timeout);
         }
         shutdown(info);
-        if (tty->driver->flush_buffer)
-                tty->driver->flush_buffer(tty);
+        rs_flush_buffer(tty);
         tty_ldisc_flush(tty);
         tty->closing = 0;
         info->tty = NULL;