From: Dan Carpenter <dan.carpenter@oracle.com>
To: Jeremy Fertic <jeremyfertic@gmail.com>
Cc: devel@driverdev.osuosl.org, Lars-Peter Clausen <lars@metafoo.de>,
Michael Hennerich <Michael.Hennerich@analog.com>,
linux-iio@vger.kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
Hartmut Knaack <knaack.h@gmx.de>,
Jonathan Cameron <jic23@kernel.org>
Subject: Re: [PATCH 04/11] staging: iio: adt7316: fix handling of dac high resolution option
Date: Fri, 14 Dec 2018 09:26:18 +0300 [thread overview]
Message-ID: <20181214062618.GW3116@kadam> (raw)
In-Reply-To: <20181213220146.GA2496@r2700x.localdomain>
On Thu, Dec 13, 2018 at 03:01:46PM -0700, Jeremy Fertic wrote:
> On Wed, Dec 12, 2018 at 11:23:16AM +0300, Dan Carpenter wrote:
> > On Tue, Dec 11, 2018 at 05:54:56PM -0700, Jeremy Fertic wrote:
> > > @@ -651,10 +649,12 @@ static ssize_t adt7316_store_da_high_resolution(struct device *dev,
> > > u8 config3;
> > > int ret;
> > >
> > > + if (chip->id == ID_ADT7318 || chip->id == ID_ADT7519)
> > > + return -EPERM;
> >
> > return -EINVAL is more appropriate than -EPERM.
> >
> > regards,
> > dan carpenter
> >
>
> I chose -EPERM because the driver uses it quite a few times in similar
> circumstances.
Yeah. I saw that when I reviewed the later patches in this series.
It's really not doing it right. -EPERM means permission checks like
access_ok() failed so it's not appropriate. -EINVAL is sort of general
purpose for invalid commands so it's probably the correct thing.
> At least with this driver, -EINVAL is used when the user
> attempts to write data that would never be valid. -EPERM is used when
> either the current device settings prevent some functionality from being
> used, or the device never supports that functionality. This patch is the
> latter, that these two chip ids never support this function.
>
> I'll change to -EINVAL in a v2 series, but I wonder if I should hold off
> on a separate patch for other instances in this driver since it will be
> undergoing a substantial refactoring.
Generally, you should prefer kernel standards over driver standards and
especially for staging. But it doesn't matter. When I reviewed this
patch, I hadn't seen that the driver was doing it like this but now I
know so it's fine. We can clean it all at once later if you want.
regards,
dan carpenter
next prev parent reply other threads:[~2018-12-14 6:27 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-12 0:54 [PATCH 00/11] staging: iio: adt7316: dac fixes Jeremy Fertic
2018-12-12 0:54 ` [PATCH 01/11] staging: iio: adt7316: fix register and bit definitions Jeremy Fertic
2018-12-16 11:19 ` Jonathan Cameron
2018-12-12 0:54 ` [PATCH 02/11] staging: iio: adt7316: invert the logic of the check for an ldac pin Jeremy Fertic
2018-12-12 8:19 ` Dan Carpenter
2018-12-13 22:06 ` Jeremy Fertic
2018-12-14 6:18 ` Dan Carpenter
2018-12-16 11:23 ` Jonathan Cameron
2018-12-12 0:54 ` [PATCH 03/11] staging: iio: adt7316: fix dac_bits assignment Jeremy Fertic
2018-12-16 11:37 ` Jonathan Cameron
2018-12-17 21:30 ` Jeremy Fertic
2018-12-22 18:03 ` Jonathan Cameron
2018-12-22 18:03 ` Jonathan Cameron
2018-12-12 0:54 ` [PATCH 04/11] staging: iio: adt7316: fix handling of dac high resolution option Jeremy Fertic
2018-12-12 8:23 ` Dan Carpenter
2018-12-13 22:01 ` Jeremy Fertic
2018-12-14 6:26 ` Dan Carpenter [this message]
2018-12-14 21:29 ` Jeremy Fertic
2018-12-12 0:54 ` [PATCH 05/11] staging: iio: adt7316: fix the dac read calculation Jeremy Fertic
2018-12-16 11:45 ` Jonathan Cameron
2018-12-12 0:54 ` [PATCH 06/11] staging: iio: adt7316: fix the dac write calculation Jeremy Fertic
2018-12-16 11:47 ` Jonathan Cameron
2018-12-12 0:54 ` [PATCH 07/11] staging: iio: adt7316: use correct variable in DAC_internal_Vref read Jeremy Fertic
2018-12-16 11:51 ` Jonathan Cameron
2018-12-12 0:55 ` [PATCH 08/11] staging: iio: adt7316: allow adt751x to use internal vref for all dacs Jeremy Fertic
2018-12-16 11:54 ` Jonathan Cameron
2018-12-12 0:55 ` [PATCH 09/11] staging: iio: adt7316: remove dac vref buffer bypass from adt751x Jeremy Fertic
2018-12-16 11:56 ` Jonathan Cameron
2018-12-12 0:55 ` [PATCH 10/11] staging: iio: adt7316: change interpretation of write to dac update mode Jeremy Fertic
2018-12-12 8:31 ` Dan Carpenter
2018-12-12 11:05 ` Jonathan Cameron
2018-12-16 11:59 ` Jonathan Cameron
2018-12-12 0:55 ` [PATCH 11/11] staging: iio: adt7316: correct spelling of ADT7316_DA_EN_VIA_DAC_LDCA Jeremy Fertic
2018-12-16 12:00 ` Jonathan Cameron
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