V4L/DVB (4679): Fix for NULL pointer dereference oops during boot.

A fix for intermittent oops's during boot which occurs
in cx88_call_i2c_clients when dvb_attach is bringing up
the frontend.

Signed-off-by: Steven Toth <stoth@hauppauge.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

diff --git a/drivers/media/video/cx88/cx88-i2c.c b/drivers/media/video/cx88/cx88-i2c.c
index 6e705a2..88af23a 100644 (file)
--- a/drivers/media/video/cx88/cx88-i2c.c
+++ b/drivers/media/video/cx88/cx88-i2c.c
@@ -145,7 +145,7 @@ void cx88_call_i2c_clients(struct cx88_core *core, unsigned int cmd, void *arg)
        if (0 != core->i2c_rc)
                return;
 
-       if (core->dvbdev) {
+       if ( (core->dvbdev) && (core->dvbdev->dvb.frontend) ) {
                if (core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl)
                        core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl(core->dvbdev->dvb.frontend, 1);