linux-kernel - Re: [PATCH 0/8] [Resend] ideapad: using EC command to control rf/camera power

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:	Wed, 18 Aug 2010 21:04:46 +0800
From:	Ike Panhc <ike.pan@...onical.com>
To:	David Woodhouse <dwmw2@...radead.org>
CC:	"platform-driver-x86@...r.kernel.org" 
	<platform-driver-x86@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Thomas Renninger <trenn@...e.de>,
	Alan Cox <alan@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Corentin Chary <corentincj@...aif.net>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	"Brown, Len" <len.brown@...el.com>,
	Matthew Garrett <mjg@...hat.com>
Subject: Re: [PATCH 0/8] [Resend] ideapad: using EC command to control rf/camera
 power

On 08/18/2010 06:35 PM, David Woodhouse wrote:
> On Wed, 2010-08-18 at 09:36 +0100, Ike Panhc wrote:
>>
>> Once the rfkill of a laptop is set to block, it is no way to unblock with Linux
>> without driver. Thanks for David Woodhouse wrote the first driver solving this.
>>
>> But the \_SB_.GECN and \_SB_.DECN are only available on Lenovo ideapad S10-3.
>> Using EC command to control rf/camera power is better because I believe every
>> ideapads which has VPC2004 device in its DSDT has this common method.
>>
>> This driver is tested and work fine on Lenovo ideapad B550 and ideapad S10-3.
> 
> Works for me too (on S10-3); thanks.
> 
> It all looks good, although should we have a delay or a schedule or at
> least a cpu_relax() in the read_ec_data() and write_ec_cmd() loops?
> Those loops should be using time_before() too, rather than open-coding
> the comparison.
> 
yeah, agree. polling from ec makes cpu busy, although its usually less then 10ms
a yield or relax will be good.
--
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/