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authorKalle Vahlman <kalle.vahlman@movial.com>2012-02-17 08:32:03 +0100
committerPhilippe Langlais <philippe.langlais@stericsson.com>2012-02-17 10:37:20 +0100
commit87842d559f6358b1b592a94f2660c1c5bb2f40ec (patch)
treeb67322ef7e7502d9225d2ed5fe924f010636296e
parent936d2759f1fe0238b3544ee3e62fdfdca4da29ec (diff)
serial/amba-pl011: Return early in deadlock work-around if there is no tty
The first amba port does not always have an attached tty, which will result in a crash if the work-around is activated. This seems to be the case for example on Snowball which has no modem hw, which seems to be the main use-case for this work-around.
-rw-r--r--drivers/tty/serial/amba-pl011.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 23b1bbe581a..09a02f32a17 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -1107,6 +1107,10 @@ static void pl011_lockup_wa(unsigned long data)
int buf_empty_retries = 200;
int loop;
+ /* Exit early if there is no tty */
+ if (!tty)
+ return;
+
/* Stop HCI layer from submitting data for tx */
tty->hw_stopped = 1;
while (!uart_circ_empty(xmit)) {