linux-kernel - Re: [PATCH 1/4] driver: add TXT driver in kernel

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Date:	Wed, 8 May 2013 02:32:19 +0000
From:	Matthew Garrett <matthew.garrett@...ula.com>
To:	Qiaowei Ren <qiaowei.ren@...el.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"platform-driver-x86@...r.kernel.org" 
	<platform-driver-x86@...r.kernel.org>,
	Xiaoyan Zhang <xiaoyan.zhang@...el.com>,
	Gang Wei <gang.wei@...el.com>
Subject: Re: [PATCH 1/4] driver: add TXT driver in kernel

On Tue, 2013-05-07 at 22:55 +0800, Qiaowei Ren wrote:
> TXT driver is expected to be a better tool to access below resources:
> TXT config space, TXT log and SMX parameter.

Please explain what these things are in the commit log, the config help
and the comment at the top of the driver - it'll make things easier for
people later.

> +         To compile this driver as a module, choose M here; the module will be
> +         called txt.

That's an awfully generic name. intel_txt would be better.

> + * This module is expected to be a better tool to access below resources

Expected to be or is? :)

> + * Data is currently found below

You're adding it to ABI, so it shouldn't just be current - are you
planning on moving it at any point? Is this functionality that should be
under securityfs instead?

> +	txt_pdev = platform_device_register_simple(DEV_NAME, -1, NULL, 0);

This will register even if there's no TXT support on the platform,
right? Is there no mechanism for determining whether a platform has TXT
support before registering a device?

> +module_init(txt_sysfs_init);
> +module_exit(txt_sysfs_exit);

And you've got no module aliases, so this will never be autoloaded. How
does the OS know that the platform implements TXT?

-- 
Matthew Garrett | mjg59@...f.ucam.org