Revert "[media] af9015: limit I2C access to keep FW happy"

This reverts commit ff83bd82.

As requested by Antti:
From a talk with him at #linuxtv irc, he strong feeling that some apps
like MythTV will do a lot a lot of I2C I/O and now it adds locks,
with utimatelly means more delays. This could cause bad effects.

There is a new patch for 3.3 that re-writes af9013 in order to limit
I2C I/O. and thus those patches could be nice to have together
because those user who has has problems are most likely MythTV users.

So, let's revert this commit for now.
Requested-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/dvb-usb/af9015.c

@@ -1093,80 +1093,9 @@ static int af9015_rc_query(struct dvb_usb_device *d)
 	return ret;
 }
 
-/* override demod callbacks for resource locking */
-static int af9015_af9013_set_frontend(struct dvb_frontend *fe,
-	struct dvb_frontend_parameters *params)
-{
-	int ret;
-	struct dvb_usb_adapter *adap = fe->dvb->priv;
-	struct af9015_state *priv = adap->dev->priv;
-
-	if (mutex_lock_interruptible(&adap->dev->usb_mutex))
-		return -EAGAIN;
-
-	ret = priv->set_frontend[adap->id](fe, params);
-
-	mutex_unlock(&adap->dev->usb_mutex);
-
-	return ret;
-}
-
-/* override demod callbacks for resource locking */
-static int af9015_af9013_read_status(struct dvb_frontend *fe,
-	fe_status_t *status)
-{
-	int ret;
-	struct dvb_usb_adapter *adap = fe->dvb->priv;
-	struct af9015_state *priv = adap->dev->priv;
-
-	if (mutex_lock_interruptible(&adap->dev->usb_mutex))
-		return -EAGAIN;
-
-	ret = priv->read_status[adap->id](fe, status);
-
-	mutex_unlock(&adap->dev->usb_mutex);
-
-	return ret;
-}
-
-/* override demod callbacks for resource locking */
-static int af9015_af9013_init(struct dvb_frontend *fe)
-{
-	int ret;
-	struct dvb_usb_adapter *adap = fe->dvb->priv;
-	struct af9015_state *priv = adap->dev->priv;
-
-	if (mutex_lock_interruptible(&adap->dev->usb_mutex))
-		return -EAGAIN;
-
-	ret = priv->init[adap->id](fe);
-
-	mutex_unlock(&adap->dev->usb_mutex);
-
-	return ret;
-}
-
-/* override demod callbacks for resource locking */
-static int af9015_af9013_sleep(struct dvb_frontend *fe)
-{
-	int ret;
-	struct dvb_usb_adapter *adap = fe->dvb->priv;
-	struct af9015_state *priv = adap->dev->priv;
-
-	if (mutex_lock_interruptible(&adap->dev->usb_mutex))
-		return -EAGAIN;
-
-	ret = priv->init[adap->id](fe);
-
-	mutex_unlock(&adap->dev->usb_mutex);
-
-	return ret;
-}
-
 static int af9015_af9013_frontend_attach(struct dvb_usb_adapter *adap)
 {
 	int ret;
-	struct af9015_state *state = adap->dev->priv;
 
 	if (adap->id == 1) {
 		/* copy firmware to 2nd demodulator */
@@ -1187,32 +1116,6 @@ static int af9015_af9013_frontend_attach(struct dvb_usb_adapter *adap)
 	adap->fe_adap[0].fe = dvb_attach(af9013_attach, &af9015_af9013_config[adap->id],
 		&adap->dev->i2c_adap);
 
-	/*
-	 * AF9015 firmware does not like if it gets interrupted by I2C adapter
-	 * request on some critical phases. During normal operation I2C adapter
-	 * is used only 2nd demodulator and tuner on dual tuner devices.
-	 * Override demodulator callbacks and use mutex for limit access to
-	 * those "critical" paths to keep AF9015 happy.
-	 * Note: we abuse unused usb_mutex here.
-	 */
-	if (adap->fe_adap[0].fe) {
-		state->set_frontend[adap->id] =
-			adap->fe_adap[0].fe->ops.set_frontend;
-		adap->fe_adap[0].fe->ops.set_frontend =
-			af9015_af9013_set_frontend;
-
-		state->read_status[adap->id] =
-			adap->fe_adap[0].fe->ops.read_status;
-		adap->fe_adap[0].fe->ops.read_status =
-			af9015_af9013_read_status;
-
-		state->init[adap->id] = adap->fe_adap[0].fe->ops.init;
-		adap->fe_adap[0].fe->ops.init = af9015_af9013_init;
-
-		state->sleep[adap->id] = adap->fe_adap[0].fe->ops.sleep;
-		adap->fe_adap[0].fe->ops.sleep = af9015_af9013_sleep;
-	}
-
 	return adap->fe_adap[0].fe == NULL ? -ENODEV : 0;
 }
 

drivers/media/dvb/dvb-usb/af9015.h

@@ -102,13 +102,6 @@ struct af9015_state {
 	u8 rc_repeat;
 	u32 rc_keycode;
 	u8 rc_last[4];
-
-	/* for demod callback override */
-	int (*set_frontend[2]) (struct dvb_frontend *fe,
-		struct dvb_frontend_parameters *params);
-	int (*read_status[2]) (struct dvb_frontend *fe, fe_status_t *status);
-	int (*init[2]) (struct dvb_frontend *fe);
-	int (*sleep[2]) (struct dvb_frontend *fe);
 };
 
 struct af9015_config {