While playing with initialization order of modem device, it has been
discovered that under some circumstances (early console init, I
believe) its .pm() callback may be called before the
uart_port->private_data pointer is initialized from
plat_serial8250_port->private_data, resulting in NULL pointer
dereference. Fix it by checking for uninitialized pointer before using
it in modem_pm().
Fixes: aabf31737a6a ("ARM: OMAP1: ams-delta: update the modem to use regulator API")
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@xxxxxxxxx>
---
arch/arm/mach-omap1/board-ams-delta.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c
index 1947bc63074e..17e0b386e1b2 100644
--- a/arch/arm/mach-omap1/board-ams-delta.c
+++ b/arch/arm/mach-omap1/board-ams-delta.c
@@ -764,6 +764,9 @@ static void modem_pm(struct uart_port *port, unsigned int state, unsigned old)
struct modem_private_data *priv = port->private_data;
int ret;
+ if (!priv)
+ return;
+
if (IS_ERR(priv->regulator))
return;
--
2.16.4
