serial: Fix locking for uart driver set_termios() method

The low-level uart driver may modify termios settings to override
settings that are not compatible with the uart, such as CRTSCTS.
Thus, callers of the low-level uart driver's set_termios() method must
hold termios_rwsem write lock to prevent concurrent access to termios,
in case such override occurs.

The termios_rwsem lock requirement does not extend to console setup
(ie., uart_set_options), as console setup cannot race with tty
operations. Nor does this lock requirement extend to functions which
cannot be concurrent with tty ioctls (ie., uart_port_startup() and
uart_resume_port()).

Further, always claim the port mutex to protect hardware
re-reprogramming in the set_termios() uart driver method. Note this
is unnecessary for console initialization in uart_set_options()
which cannot be concurrent with other uart operations.

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

2 files changed, 11 insertions, 3 deletions

diff --git a/Documentation/serial/driver b/Documentation/serial/driver
index ba64e4b892e9..c415b0ef4493 100644
--- a/Documentation/serial/driver
+++ b/Documentation/serial/driver
@@ -59,7 +59,9 @@ The core driver uses the info->tmpbuf_sem lock to prevent multi-threaded
 access to the info->tmpbuf bouncebuffer used for port writes.
 
 The port_sem semaphore is used to protect against ports being added/
-removed or reconfigured at inappropriate times.
+removed or reconfigured at inappropriate times. Since v2.6.27, this
+semaphore has been the 'mutex' member of the tty_port struct, and
+commonly referred to as the port mutex (or port->mutex).
 
 
 uart_ops
@@ -248,7 +250,7 @@ hardware.
         Other flags may be used (eg, xon/xoff characters) if your
         hardware supports hardware "soft" flow control.
 
-        Locking: none.
+        Locking: caller holds port->mutex
         Interrupts: caller dependent.
         This call must not sleep
 
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 9d142972ee2d..e31d56159aee 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -436,7 +436,7 @@ uart_get_divisor(struct uart_port *port, unsigned int baud)
 
 EXPORT_SYMBOL(uart_get_divisor);
 
-/* FIXME: Consistent locking policy */
+/* Caller holds port mutex */
 static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
                                         struct ktermios *old_termios)
 {
@@ -1173,11 +1173,15 @@ uart_ioctl(struct tty_struct *tty, unsigned int cmd,
                 break;
 
         case TIOCSSERIAL:
+                down_write(&tty->termios_rwsem);
                 ret = uart_set_info_user(tty, state, uarg);
+                up_write(&tty->termios_rwsem);
                 break;
 
         case TIOCSERCONFIG:
+                down_write(&tty->termios_rwsem);
                 ret = uart_do_autoconfig(tty, state);
+                up_write(&tty->termios_rwsem);
                 break;
 
         case TIOCSERGWILD: /* obsolete */
@@ -1278,7 +1282,9 @@ static void uart_set_termios(struct tty_struct *tty,
                 return;
         }
 
+        mutex_lock(&state->port.mutex);
         uart_change_speed(tty, state, old_termios);
+        mutex_unlock(&state->port.mutex);
         /* reload cflag from termios; port driver may have overriden flags */
         cflag = tty->termios.c_cflag;