linux-kernel - Re: [PATCH v4 1/7] iio: pressure: bmp280: Use bulk read for humidity calibration data

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: <20240829185753.GA3493@vamoiridPC>
Date: Thu, 29 Aug 2024 20:57:53 +0200
From: Vasileios Amoiridis <vassilisamir@...il.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Vasileios Amoiridis <vassilisamir@...il.com>, jic23@...nel.org,
	lars@...afoo.de, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, ang.iglesiasg@...il.com,
	linus.walleij@...aro.org, biju.das.jz@...renesas.com,
	javier.carrasco.cruz@...il.com, semen.protsenko@...aro.org,
	579lpy@...il.com, ak@...klinger.de, linux-iio@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	christophe.jaillet@...adoo.fr
Subject: Re: [PATCH v4 1/7] iio: pressure: bmp280: Use bulk read for humidity
 calibration data

On Thu, Aug 29, 2024 at 03:06:14PM +0300, Andy Shevchenko wrote:
> On Wed, Aug 28, 2024 at 10:51:21PM +0200, Vasileios Amoiridis wrote:
> > Convert individual reads to a bulk read for the humidity calibration data.
> 
> ...
> 
> > +	calib->H2 = get_unaligned_le16(&data->bme280_humid_cal_buf[H2]);
> > +	calib->H3 = data->bme280_humid_cal_buf[H3];
> > +	tmp_1 = get_unaligned_be16(&data->bme280_humid_cal_buf[H4]);
> > +	tmp_2 = FIELD_GET(BME280_COMP_H4_GET_MASK_UP, tmp_1);
> > +	h4_upper = FIELD_PREP(BME280_COMP_H4_PREP_MASK_UP, tmp_2);
> > +	h4_lower = FIELD_GET(BME280_COMP_H4_MASK_LOW,
> 
> > +			get_unaligned_be16(&data->bme280_humid_cal_buf[H4]));
> 
> Either I don't understand the side effects, or this is the same as tmp_1. No?
> 

Hi Andy,

Thanks again for taking the time to review this!

This is the same as tmp1, and I didn't notice that I should change it.
Thanks for pointing it out.

Cheers,
Vasilis
> > +	calib->H4 = sign_extend32(h4_upper | h4_lower, 11);
> > +	calib->H5 = sign_extend32(FIELD_GET(BME280_COMP_H5_MASK,
> > +			get_unaligned_le16(&data->bme280_humid_cal_buf[H5])), 11);
> > +	calib->H6 = data->bme280_humid_cal_buf[H6];
> 
> -- 
> With Best Regards,
> Andy Shevchenko
> 
>