linux-kernel - Re: [PATCH 2/6] DMI: Introduce dmi_first_match to make the interface more flexible

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Date:	Wed, 01 Oct 2008 12:31:57 +0900
From:	Tejun Heo <htejun@...il.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Jeff Garzik <jeff@...zik.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	linux-ide@...r.kernel.org, Thomas Renninger <trenn@...e.de>,
	Robert Hancock <hancockr@...w.ca>,
	LKML <linux-kernel@...r.kernel.org>,
	Frans Pop <elendil@...net.nl>,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>, Jean Delvare <jdelvare@...e.de>,
	ralf@...ux-mips.org
Subject: Re: [PATCH 2/6] DMI: Introduce dmi_first_match to make the interface
 more flexible

Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> DMI: Introduce dmi_first_match to make the interface more flexible
> 
> Some notebooks from HP have the problem that their BIOSes attempt to
> spin down hard drives before entering ACPI system states S4 and S5.
> This leads to a yo-yo effect during system power-off shutdown and the
> last phase of hibernation when the disk is first spun down by the
> kernel and then almost immediately turned on and off by the BIOS.
> This, in turn, may result in shortening the disk's life times.
> 
> To prevent this from happening we can blacklist the affected systems
> using DMI information.  However, only the on-board controlles should
> be blacklisted and their PCI slot numbers can be used for this
> purpose.  Unfortunately the existing interface for checking DMI
> information of the system is not very convenient for this purpose,
> because to use it, we would have to define special callback functions
> or create a separate struct dmi_system_id table for each blacklisted
> system.
> 
> To overcome this difficulty introduce a new function
> dmi_first_match() returning a pointer to the first entry in an array
> of struct dmi_system_id elements that matches the system DMI
> information.  Then, we can use this pointer to access the entry's
> .driver_data field containing the additional information, such as
> the PCI slot number, allowing us to do the desired blacklisting.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>

Acked-by: Tejun Heo <tj@...nel.org>

(cc'ing recent committers to dmi)

If no one objects, I'd like to push this through libata-dev#upstream.
Any objections?

Thanks.

-- 
tejun
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