Em 09-08-2012 19:25, Antti Palosaari escreveu: > Demodulator cannot perform statistic IOCTLs when it is not tuned. > Return -EPERM in such case.
While, in general, doing it makes sense, -EPERM is a very bad return code. It is used to indicate when accessing some resources would require root access. > > Signed-off-by: Antti Palosaari <cr...@iki.fi> > --- > drivers/media/dvb/dvb-core/dvb_frontend.c | 34 > +++++++++++++++++++++++-------- > 1 file changed, 25 insertions(+), 9 deletions(-) > > diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c > b/drivers/media/dvb/dvb-core/dvb_frontend.c > index 4fc11eb..40efcde 100644 > --- a/drivers/media/dvb/dvb-core/dvb_frontend.c > +++ b/drivers/media/dvb/dvb-core/dvb_frontend.c > @@ -2157,27 +2157,43 @@ static int dvb_frontend_ioctl_legacy(struct file > *file, > err = fe->ops.read_status(fe, status); > break; > } > + > case FE_READ_BER: > - if (fe->ops.read_ber) > - err = fe->ops.read_ber(fe, (__u32*) parg); > + if (fe->ops.read_ber) { > + if (fepriv->thread) > + err = fe->ops.read_ber(fe, (__u32 *) parg); > + else > + err = -EPERM; > + } > break; > > case FE_READ_SIGNAL_STRENGTH: > - if (fe->ops.read_signal_strength) > - err = fe->ops.read_signal_strength(fe, (__u16*) parg); > + if (fe->ops.read_signal_strength) { > + if (fepriv->thread) > + err = fe->ops.read_signal_strength(fe, (__u16 > *) parg); > + else > + err = -EPERM; > + } > break; Signal strength can still be available even without locking. > > case FE_READ_SNR: > - if (fe->ops.read_snr) > - err = fe->ops.read_snr(fe, (__u16*) parg); > + if (fe->ops.read_snr) { > + if (fepriv->thread) > + err = fe->ops.read_snr(fe, (__u16 *) parg); > + else > + err = -EPERM; > + } > break; > > case FE_READ_UNCORRECTED_BLOCKS: > - if (fe->ops.read_ucblocks) > - err = fe->ops.read_ucblocks(fe, (__u32*) parg); > + if (fe->ops.read_ucblocks) { > + if (fepriv->thread) > + err = fe->ops.read_ucblocks(fe, (__u32 *) parg); > + else > + err = -EPERM; > + } > break; > > - > case FE_DISEQC_RESET_OVERLOAD: > if (fe->ops.diseqc_reset_overload) { > err = fe->ops.diseqc_reset_overload(fe); > Regards, Mauro -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html