diff options
| -rw-r--r-- | drivers/tty/tty_port.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c index f4698696abae..69e072b59127 100644 --- a/drivers/tty/tty_port.c +++ b/drivers/tty/tty_port.c @@ -348,6 +348,11 @@ EXPORT_SYMBOL(tty_port_lower_dtr_rts); * do carrier detect and the dtr_rts method if it supports software * management of these lines. Note that the dtr/rts raise is done each * iteration as a hangup may have previously dropped them while we wait. + * + * Caller holds tty lock. + * + * NB: May drop and reacquire tty lock when blocking, so tty and tty_port + * may have changed state (eg., may have been hung up). */ int tty_port_block_til_ready(struct tty_port *port, |