linux-kernel - RE: [PATCH v7 2/2] iio: adc: max14001: New driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <e92f919e59974bb2ae32a8d961e07538@analog.com>
Date:   Wed, 21 Jun 2023 00:38:08 +0000
From:   "Paller, Kim Seer" <KimSeer.Paller@...log.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
CC:     "jic23@...nel.org" <jic23@...nel.org>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "Hennerich, Michael" <Michael.Hennerich@...log.com>,
        "robh@...nel.org" <robh@...nel.org>,
        "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH v7 2/2] iio: adc: max14001: New driver


> -----Original Message-----
> From: Andy Shevchenko <andy.shevchenko@...il.com>
> Sent: Tuesday, June 20, 2023 11:15 PM
> To: Paller, Kim Seer <KimSeer.Paller@...log.com>
> Cc: jic23@...nel.org; lars@...afoo.de; lgirdwood@...il.com;
> broonie@...nel.org; Hennerich, Michael <Michael.Hennerich@...log.com>;
> robh@...nel.org; krzysztof.kozlowski@...aro.org; conor+dt@...nel.org; linux-
> iio@...r.kernel.org; linux-kernel@...r.kernel.org; devicetree@...r.kernel.org
> Subject: Re: [PATCH v7 2/2] iio: adc: max14001: New driver
> 
> [External]
> 
> On Tue, Jun 20, 2023 at 4:27 PM Kim Seer Paller
> <kimseer.paller@...log.com> wrote:
> >
> > The MAX14001 is configurable, isolated 10-bit ADCs for multi-range
> > binary inputs.
> 
> ...
> 
> > +       /*
> > +        * Align received data from the receive buffer, reversing and reordering
> > +        * it to match the expected MSB-first format.
> > +        */
> > +       *data = (__force u16)(be16_to_cpu(bitrev16(st->spi_rx_buffer))) &
> > +                                                       MAX14001_DATA_MASK;
> 
> Using __force in the C files is somehow stinky.
> 
> ...
> 
> > +       /*
> > +        * Convert transmit buffer to big-endian format and reverse transmit
> > +        * buffer to align with the LSB-first input on SDI port.
> > +        */
> > +       st->spi_tx_buffer = (__force u16)(cpu_to_be16(bitrev16(
> 
> You have a different type of spi_tx_buffer than u16, don't you?

I have the same type of spi_tx_buffer as u16. 

Other than using force cast, is there any way to resolve the endian warning? I have 
actually swapped the order of bitrev16() and cpu_to_be16/be16_to_cpu() functions. 
I have tested and they also work fine.

Best regards,
Kim Seer Paller