linux-kernel - Re: [PATCH 1/4] regmap: irq: Fix lost interrupts by introducing handle

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:   Tue, 4 Apr 2017 06:56:30 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
        Lee Jones <lee.jones@...aro.org>,
        Marcel Partap <mpartap@....net>,
        Michael Scott <michael.scott@...aro.org>
Subject: Re: [PATCH 1/4] regmap: irq: Fix lost interrupts by introducing
 handle_reread

* Mark Brown <broonie@...nel.org> [170404 05:22]:
> On Mon, Apr 03, 2017 at 08:03:00PM -0700, Tony Lindgren wrote:
> 
> > So I'll drop the genirq/regmap_irq related hacks and resend just
> > the minimal MFD fixes. Similar misconfiguration may be the root
> > cause for other drivers too..
> 
> It is sadly far too common for people to implement interrupt controllers
> that only do edge triggers, I've no idea why even on what are supposed
> to be relatively high end SoCs.  It seems to be a hardware designer
> thing, AFAICT they think for something to be useful it needs to be a bit
> more complicated.

For edge only GPIO controllers handling level interrupts might be
somewhat fixable in software. The GPIO controller could have a loop
reading of the GPIO line status in the interrupt handler and comparing
it to the configured triggering.

Regards,

Tony