V4L/DVB (6979): tda18271: use a mutex to protect state in critical sections

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/tda18271-priv.h b/drivers/media/dvb/frontends/tda18271-priv.h
index b4d1ab770ca2..af89cfab0066 100644
--- a/drivers/media/dvb/frontends/tda18271-priv.h
+++ b/drivers/media/dvb/frontends/tda18271-priv.h
@@ -23,6 +23,7 @@
 
 #include <linux/kernel.h>
 #include <linux/types.h>
+#include <linux/mutex.h>
 #include "tda18271.h"
 
 #define R_ID     0x00   /* ID byte                */
@@ -112,6 +113,8 @@ struct tda18271_priv {
         struct tda18271_std_map std;
         struct tda18271_rf_tracking_filter_cal rf_cal_state[8];
 
+        struct mutex lock;
+
         u32 frequency;
         u32 bandwidth;
 };