[media] rtl2830: implement own I2C locking

Own I2C locking is needed due to two special reasons:
1) Chips uses multiple register pages/banks on single I2C slave.
Page is changed via I2C register access.
2) Chip offers muxed/gated I2C adapter for tuner. Gate/mux is
controlled by I2C register access.

Due to these reasons, I2C locking did not fit very well.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/media/dvb-frontends/rtl2830_priv.h b/drivers/media/dvb-frontends/rtl2830_priv.h
index 293188924f51..517758ab687a 100644
--- a/drivers/media/dvb-frontends/rtl2830_priv.h
+++ b/drivers/media/dvb-frontends/rtl2830_priv.h
@@ -30,6 +30,7 @@ struct rtl2830_dev {
         struct i2c_adapter *adapter;
         struct dvb_frontend fe;
         bool sleeping;
+        struct mutex i2c_mutex;
         u8 page; /* active register page */
         unsigned long filters;
         struct delayed_work stat_work;