Em Fri, 26 Nov 2021 12:45:23 -0700
Nathan Chancellor <nathan@kernel.org> escreveu:
> On Wed, Nov 24, 2021 at 08:13:10PM +0100, Mauro Carvalho Chehab wrote:
> > If an error occurs while setting the registers at set_frontend,
> > it is silently ignored. Yet, the variable status is updated.
> >
> > Change the logic to return an error if it fails to write values
> > to the registers.
> >
> > Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
>
> I am not super familiar with the different return codes so I assume it
> is appropriate (the sites that I see calling set_frontend() appears to
> only check for a negative return code).
There are a couple of return codes used on media when I/O transfer fails.
Some places use -EREMOTEIO. Others use -EIO or -ENXIO.
I guess -EREMOTEIO is a little bit better than -EIO for I2C transfers,
as the problem usually happened inside an I2C bus at the DVB adapter.
>
> Reviewed-by: Nathan Chancellor <nathan@kernel.org>
>
> > ---
> >
> > To avoid mailbombing on a large number of people, only mailing lists were C/C on the cover.
> > See [PATCH 00/20] at: https://lore.kernel.org/all/cover.1637781097.git.mchehab+huawei@kernel.org/
> >
> > drivers/media/dvb-frontends/si21xx.c | 7 ++++---
> > 1 file changed, 4 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/media/dvb-frontends/si21xx.c b/drivers/media/dvb-frontends/si21xx.c
> > index e31eb2c5cc4c..001b23588389 100644
> > --- a/drivers/media/dvb-frontends/si21xx.c
> > +++ b/drivers/media/dvb-frontends/si21xx.c
> > @@ -711,7 +711,7 @@ static int si21xx_set_frontend(struct dvb_frontend *fe)
> > int i;
> > bool inband_interferer_div2[ALLOWABLE_FS_COUNT];
> > bool inband_interferer_div4[ALLOWABLE_FS_COUNT];
> > - int status;
> > + int status = 0;
> >
> > /* allowable sample rates for ADC in MHz */
> > int afs[ALLOWABLE_FS_COUNT] = { 200, 192, 193, 194, 195,
> > @@ -747,8 +747,6 @@ static int si21xx_set_frontend(struct dvb_frontend *fe)
> > rf_freq = 10 * c->frequency ;
> > data_rate = c->symbol_rate / 100;
> >
> > - status = PASS;
> > -
> > band_low = (rf_freq - lnb_lo) - ((lnb_uncertanity * 200)
> > + (data_rate * 135)) / 200;
> >
> > @@ -832,6 +830,9 @@ static int si21xx_set_frontend(struct dvb_frontend *fe)
> > state->fs = sample_rate;/*ADC MHz*/
> > si21xx_setacquire(fe, c->symbol_rate, c->fec_inner);
> >
> > + if (status)
> > + return -EREMOTEIO;
> > +
> > return 0;
> > }
> >
> > --
> > 2.33.1
> >
> >
Thanks,
Mauro