linux-kernel - Re: [PATCH] pinctrl: stm32: add lock mechanism for irqmux selection

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:   Fri, 24 May 2019 13:26:14 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Alexandre Torgue <alexandre.torgue@...com>
Cc:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH] pinctrl: stm32: add lock mechanism for irqmux selection

On Fri, May 10, 2019 at 9:43 AM Alexandre Torgue
<alexandre.torgue@...com> wrote:

> GPIOs are split between several banks (A, B, ...) and each bank can have
> up to 16 lines. Those GPIOs could be used as interrupt lines thanks to
> exti lines. As there are only 16 exti lines, a mux is used to select which
> gpio line is connected to which exti line. Mapping is done as follow:
>
> -A0, B0, C0.. -->exti_line_0 (X0 selected by mux_0)
> -A1, B1, C1.. -->exti_line_1 (X1 selected by mux_1)
> ...
>
> This patch adds a protection to avoid overriding on mux_n for exti_line_n.
>
> Signed-off-by: Alexandre Torgue <alexandre.torgue@...com>

Patch applied, can't say I fully understand it but you know what
you're doing!

Yours,
Linus Walleij