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

This reverts commit ff83bd82cb343d37b5ab8e402aaad9ef33d03f1e.

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>

2 files changed, 0 insertions, 104 deletions

diff --git a/drivers/media/dvb/dvb-usb/af9015.c b/drivers/media/dvb/dvb-usb/af9015.c
index 033aa8affd8e..c6c275bac08e 100644
--- a/drivers/media/dvb/dvb-usb/af9015.c
+++ b/drivers/media/dvb/dvb-usb/af9015.c
@@ -1093,80 +1093,9 @@ error:
         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;
 }
 
diff --git a/drivers/media/dvb/dvb-usb/af9015.h b/drivers/media/dvb/dvb-usb/af9015.h
index 4a126177e101..6252ea6c1904 100644
--- a/drivers/media/dvb/dvb-usb/af9015.h
+++ b/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 {