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.
---
drivers/tty/serial/amba-pl011.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index 6800f5f..c3ffbed 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -1061,6 +1061,10 @@ 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)) {
--
1.7.1
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