[PATCH 3.2 080/149] serial: pch_uart: fix tty-kref leak in dma-rxpath

From: Ben Hutchings
Date: Mon Oct 21 2013 - 05:13:37 EST


3.2.52-rc1 review patch. If anyone has any objections, please let me know.

------------------

From: Johan Hovold <jhovold@xxxxxxxxx>

commit 19b85cfb190eb9980eaf416bff96aef4159a430e upstream.

Fix tty_kref leak when tty_buffer_request room fails in dma-rx path.

Note that the tty ref isn't really needed anymore, but as the leak has
always been there, fixing it before removing should makes it easier to
backport the fix.

Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/tty/serial/pch_uart.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -552,11 +552,12 @@ static int dma_push_rx(struct eg20t_port
dev_warn(port->dev, "Rx overrun: dropping %u bytes\n",
size - room);
if (!room)
- return room;
+ goto out;

tty_insert_flip_string(tty, sg_virt(&priv->sg_rx), size);

port->icount.rx += room;
+out:
tty_kref_put(tty);

return room;

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