This corrects a crash in kgdb_nmi_tty_shutdown() which occurs when the function is called with port->tty set to NULL.
All conversions between struct tty_port and struct kgdb_nmi_tty_priv have been switched to direct calls to container_of() to improve code clarity and consistancy.
Signed-off-by: Daniel Thompson daniel.thompson@linaro.org --- drivers/tty/serial/kgdb_nmi.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-)
diff --git a/drivers/tty/serial/kgdb_nmi.c b/drivers/tty/serial/kgdb_nmi.c index 5f673b7..d51b2a1 100644 --- a/drivers/tty/serial/kgdb_nmi.c +++ b/drivers/tty/serial/kgdb_nmi.c @@ -84,11 +84,6 @@ struct kgdb_nmi_tty_priv { STRUCT_KFIFO(char, KGDB_NMI_FIFO_SIZE) fifo; };
-static struct kgdb_nmi_tty_priv *kgdb_nmi_port_to_priv(struct tty_port *port) -{ - return container_of(port, struct kgdb_nmi_tty_priv, port); -} - /* * Our debugging console is polled in a tasklet, so we'll check for input * every tick. In HZ-less mode, we should program the next tick. We have @@ -118,7 +113,7 @@ static void kgdb_tty_recv(int ch) * do that, and actually, we can't: we're in NMI context, no locks are * possible. */ - priv = kgdb_nmi_port_to_priv(kgdb_nmi_port); + priv = container_of(kgdb_nmi_port, struct kgdb_nmi_tty_priv, port); kfifo_in(&priv->fifo, &c, 1); kgdb_tty_poke(); } @@ -216,7 +211,8 @@ static void kgdb_nmi_tty_receiver(unsigned long data)
static int kgdb_nmi_tty_activate(struct tty_port *port, struct tty_struct *tty) { - struct kgdb_nmi_tty_priv *priv = tty->driver_data; + struct kgdb_nmi_tty_priv *priv = + container_of(port, struct kgdb_nmi_tty_priv, port);
kgdb_nmi_port = port; tasklet_schedule(&priv->tlet); @@ -225,7 +221,8 @@ static int kgdb_nmi_tty_activate(struct tty_port *port, struct tty_struct *tty)
static void kgdb_nmi_tty_shutdown(struct tty_port *port) { - struct kgdb_nmi_tty_priv *priv = port->tty->driver_data; + struct kgdb_nmi_tty_priv *priv = + container_of(port, struct kgdb_nmi_tty_priv, port);
tasklet_kill(&priv->tlet); kgdb_nmi_port = NULL;