max3110: Fix up port->tty backreferencing
We want to keep refcounts properly on this against hangup.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/tty/serial/mrst_max3110.c b/drivers/tty/serial/mrst_max3110.c
index 42aa439..1aa2c3c 100644
--- a/drivers/tty/serial/mrst_max3110.c
+++ b/drivers/tty/serial/mrst_max3110.c
@@ -347,7 +347,7 @@
if (!port->state)
return 0;
- tty = port->state->port.tty;
+ tty = tty_port_tty_get(&port->state->port);
if (!tty)
return 0;
@@ -364,8 +364,10 @@
}
}
- if (!w)
+ if (!w) {
+ tty_kref_put(tty);
return 0;
+ }
for (r = 0; w; r += usable, w -= usable) {
usable = tty_buffer_request_room(tty, w);
@@ -375,6 +377,7 @@
}
}
tty_flip_buffer_push(tty);
+ tty_kref_put(tty);
return r;
}