[media] drxk_hard: fix locking issues when changing the delsys

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/frontends/drxk_hard.c

@@ -6188,7 +6188,6 @@ static int drxk_sleep(struct dvb_frontend *fe)
 
 	dprintk(1, "\n");
 	ShutDown(state);
-	mutex_unlock(&state->ctlock);
 	return 0;
 }
 
@@ -6203,7 +6202,7 @@ static int drxk_gate_ctrl(struct dvb_frontend *fe, int enable)
 static int drxk_set_parameters(struct dvb_frontend *fe)
 {
 	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
-	u32 delsys  = p->delivery_system;
+	u32 delsys  = p->delivery_system, old_delsys;
 	struct drxk_state *state = fe->demodulator_priv;
 	u32 IF;
 
@@ -6221,8 +6220,12 @@ static int drxk_set_parameters(struct dvb_frontend *fe)
 		fe->ops.tuner_ops.set_params(fe);
 	if (fe->ops.i2c_gate_ctrl)
 		fe->ops.i2c_gate_ctrl(fe, 0);
+
+	old_delsys = state->props.delivery_system;
 	state->props = *p;
 
+	if (old_delsys != delsys) {
+		ShutDown(state);
 		switch (delsys) {
 		case SYS_DVBC_ANNEX_A:
 		case SYS_DVBC_ANNEX_C:
@@ -6244,6 +6247,7 @@ static int drxk_set_parameters(struct dvb_frontend *fe)
 		default:
 			return -EINVAL;
 		}
+	}
 
 	fe->ops.tuner_ops.get_if_frequency(fe, &IF);
 	Start(state, 0, IF);
@@ -6405,7 +6409,6 @@ struct dvb_frontend *drxk_attach(const struct drxk_config *config,
 		state->m_GPIO &= ~state->antenna_gpio;
 
 	mutex_init(&state->mutex);
-	mutex_init(&state->ctlock);
 
 	memcpy(&state->frontend.ops, &drxk_ops, sizeof(drxk_ops));
 	state->frontend.demodulator_priv = state;

drivers/media/dvb/frontends/drxk_hard.h

@@ -204,7 +204,6 @@ struct drxk_state {
 	void  *priv;
 
 	struct mutex mutex;
-	struct mutex ctlock;
 
 	u32    m_Instance;           /**< Channel 1,2,3 or 4 */