After commit "TTY: move tty buffers to tty_port", the tty buffers are
not freed in some drivers. This is because tty_port_destructor is not
called whenever a tty_port is freed. This was an assumption I counted
with but was unfortunately untrue. So fix the drivers to fulfil this
assumption.
PTY is one of those, here we just need to use tty_port_put instead of
kfree. (Assuming tty_port_destructor does not need port->ops to be set
which we change here too.)
Signed-off-by: Jiri Slaby <jsl...@suse.cz>
---
drivers/tty/pty.c | 2 +-
drivers/tty/tty_port.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 0ce0b3e..a541ec8 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -408,7 +408,7 @@ static void pty_unix98_shutdown(struct tty_struct *tty)
static void pty_cleanup(struct tty_struct *tty)
{
tty->port->itty = NULL;
- kfree(tty->port);
+ tty_port_put(tty->port);
}
/* Traditional BSD devices */
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 416b42f..fdc42c2 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -128,7 +128,7 @@ static void tty_port_destructor(struct kref *kref)
if (port->xmit_buf)
free_page((unsigned long)port->xmit_buf);
tty_buffer_free_all(port);
- if (port->ops->destruct)
+ if (port->ops && port->ops->destruct)
port->ops->destruct(port);
else
kfree(port);
--
1.8.0
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