linux-kernel - Re: [PATCH 1/5] max44000: Initial commit

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]

Date:	Mon, 18 Apr 2016 13:34:51 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Crestez Dan Leonard <leonard.crestez@...el.com>
Cc:	Jonathan Cameron <jic23@...nel.org>,
	Peter Meerwald-Stadler <pmeerw@...erw.net>,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Daniel Baluta <daniel.baluta@...el.com>
Subject: Re: [PATCH 1/5] max44000: Initial commit

On Mon, Apr 18, 2016 at 03:15:54PM +0300, Crestez Dan Leonard wrote:

> As a further clarification: regmap_write will write to hardware even if
> the cache is known to be up-to-date and no matter the regcache_type. Did
> I understand this correctly?

> I'm basing this on reading the code, it seems to me that map->reg_write
> is only avoided on error paths or if map->cache_only is set to true.

> This always-write guarantee is not obvious and if it's OK for drivers to
> rely on it perhaps it should be explicitly documented on regmap_write.

Yes.  I have to say that you are the first person I've encountered who
has been confused by this, I'm not sure why you'd expect writes to be
discarded.

Download attachment "signature.asc" of type "application/pgp-signature" (474 bytes)