On Mon April 8 2013 00:02:15 Frank Schäfer wrote:
> 
> 
> In em28xx_start_streaming() and also em28xx_stop_streaming() we do
> 
>      struct em28xx *dev = dvb->adapter.priv;
> 
> which I would say should be the culprit.
> Are you sure that dvb->adapter.priv needs to be assigned to i2c_bus
> instead of dev ?
> Anyway, I modified both functions to obtain the right pointer to dev,
> but this caused another oops.
> I also tested without changing dvb->adapter.priv: oops :-/

Can you try this patch? I did miss the adapter.priv change, so I've added that.
I also noticed that I converted fe->dvb->priv as well, which is not correct.

So I'm hoping that this will do the trick.

Regards,

        Hans

diff --git a/drivers/media/usb/em28xx/em28xx-dvb.c 
b/drivers/media/usb/em28xx/em28xx-dvb.c
index 42a6a26..1f1f56f 100644
--- a/drivers/media/usb/em28xx/em28xx-dvb.c
+++ b/drivers/media/usb/em28xx/em28xx-dvb.c
@@ -178,7 +178,8 @@ static inline int em28xx_dvb_urb_data_copy(struct em28xx 
*dev, struct urb *urb)
 static int em28xx_start_streaming(struct em28xx_dvb *dvb)
 {
        int rc;
-       struct em28xx *dev = dvb->adapter.priv;
+       struct em28xx_i2c_bus *i2c_bus = dvb->adapter.priv;
+       struct em28xx *dev = i2c_bus->dev;
        int dvb_max_packet_size, packet_multiplier, dvb_alt;
 
        if (dev->dvb_xfer_bulk) {
@@ -217,7 +218,8 @@ static int em28xx_start_streaming(struct em28xx_dvb *dvb)
 
 static int em28xx_stop_streaming(struct em28xx_dvb *dvb)
 {
-       struct em28xx *dev = dvb->adapter.priv;
+       struct em28xx_i2c_bus *i2c_bus = dvb->adapter.priv;
+       struct em28xx *dev = i2c_bus->dev;
 
        em28xx_stop_urbs(dev);
 
@@ -839,7 +841,7 @@ static int em28xx_register_dvb(struct em28xx_dvb *dvb, 
struct module *module,
        if (dvb->fe[1])
                dvb->fe[1]->ops.ts_bus_ctrl = em28xx_dvb_bus_ctrl;
 
-       dvb->adapter.priv = dev;
+       dvb->adapter.priv = &dev->i2c_bus[dev->def_i2c_bus];
 
        /* register frontend */
        result = dvb_register_frontend(&dvb->adapter, dvb->fe[0]);
--
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