Am Thu, 19 Nov 2009 16:37:18 +0100 (CET)
schrieb Patrick Boettcher <pboettcher@xxxxxxxxxxxxxx>:
> On Sat, 7 Nov 2009, Mario Bachmann wrote:
>
> > Hi there,
> >
> > I tried linux-2.6.31.5 and tuning still does not work:
> > tuning to 738000000 Hz
> > video pid 0x0131, audio pid 0x0132
> > status 00 | signal 0000 | snr 0000 | ber 001fffff | unc 0000ffff |
> > status 00 | signal 0000 | snr 0000 | ber 001fffff | unc 0000ffff |
> > status 00 | signal 0000 | snr 0000 | ber 001fffff | unc 0000ffff |
> > status 04 | signal 0000 | snr 0000 | ber 001fffff | unc 0000ffff |
> >
> > With some changes for the following file it works again:
> > /usr/src/linux/drivers/media/dvb/dvb-usb/dibusb-common.c
> >
> > diff -Naur dibusb-common.c-ORIGINAL dibusb-common.c
> >
> > --- dibusb-common.c-ORIGINAL 2009-11-07 10:30:43.705344308 +0100
> > +++ dibusb-common.c 2009-11-07 10:33:49.969345253 +0100
> > @@ -133,17 +133,14 @@
> >
> > for (i = 0; i < num; i++) {
> > /* write/read request */
> > - if (i+1 < num && (msg[i].flags & I2C_M_RD) == 0
> > - && (msg[i+1].flags & I2C_M_RD)) {
> > + if (i+1 < num && (msg[i+1].flags & I2C_M_RD)) {
> > if (dibusb_i2c_msg(d, msg[i].addr, msg[i].buf,msg[i].len,
> > msg[i+1].buf,msg[i+1].len) < 0)
> > break;
> > i++;
> > - } else if ((msg[i].flags & I2C_M_RD) == 0) {
> > + } else
> > if (dibusb_i2c_msg(d, msg[i].addr, msg[i].buf,msg[i].len,NULL,0) < 0)
> > break;
> > - } else
> > - break;
> > }
>
> Doing it is reverting a fix which avoids that uncontrolled i2c-access from
> userspace is destroying the USB-eeprom.
>
> I understand that this is breaking the tuning for your board. I'm just not
> understanding why.
>
> If you have some time to debug this issue, could you please try the
> following:
>
> One of the devices for your board is trying to do an I2c access which is
> falling into the last 'else'-branch - can you add a printk to find out
> which one it is? The access must be wrongly constructed and must be fixed
> in that driver.
>
> thanks,
>
> PS: if you don't have time to do it, please tell so.
>
> --
>
> Patrick
> http://www.kernellabs.com/
I do not understand exactly. printk what? Could you please give me a
complete piece of code with the printk command? Would be great!
My printk-tries ends up in an "Oops".
Thank you.
Mario
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