linux-kernel - Re: [PATCH 2/2] gpio / ACPI: add support for GPIO operation regions

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: <20130915065151.GK7393@intel.com>
Date:	Sun, 15 Sep 2013 09:51:51 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	"Zheng, Lv" <lv.zheng@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH 2/2] gpio / ACPI: add support for GPIO operation regions

On Sat, Sep 14, 2013 at 12:10:37AM +0000, Zheng, Lv wrote:
> Is it possible to install the handler for ACPI_ROOT_OBJECT?
> Can it be achieved by implementing a setup callback?

Yes that can be done. However, that would mean that we always install the
operation region handler even if there is no suitable GPIO driver loaded.
With this patch we install the handler once the GPIO driver for this device
is registered. If nothing is registered no handlers will be installed.

What would be the advantage in doing what you propose?

> Maybe you can also eliminate acpi_attach_data usages by doing so.

I think we still need that for ACPI _EVT handling.
--
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/