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, 1 Dec 2014 15:08:45 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Richard Weinberger <richard@....at>
Cc:	Harald Geyer <harald@...ib.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Alexandre Courbot <acourbot@...dia.com>,
	Stephen Warren <swarren@...dia.com>,
	Jonathan Cameron <jic23@...nel.org>,
	Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald <pmeerw@...erw.net>,
	"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: iio: dht11 broken

On Mon, Dec 1, 2014 at 11:59 AM, Richard Weinberger <richard@....at> wrote:
> Am 01.12.2014 um 11:49 schrieb Harald Geyer:

>> Any input from gpiolib people about what the proper fix would be in
>> their opinion, of course is appreciated. I don't think the dht11 driver
>> is doing anything unreasonable per se, so maybe they can clarify how
>> the API is intended to be used?
>
> Your driver sets up a GPIO as IRQ and then you switch the mode to output
> to enable the DHT sensor.
> This is not an API issue, it is an design issue.
> I'm not a hardware expert but AFAIK setting an IRQ pin into output mode can
> lead to undefined behavior.

Well that check is there exactly to prevent madness like this.

IRQs on pins set to output *does* *not* *make* *sense*.

Remove the IRQ before setting the pin to output and vice
versa and everyone will be happier.

Yours,
Linus Walleij
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists