Messages in this thread | | | Date | Sat, 13 Sep 2008 22:21:54 -0400 | From | Jeff Garzik <> | Subject | Re: [PATCH] SATA: Blacklist systems that spin off disks during ACPI power off |
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Tejun Heo wrote: > Rafael J. Wysocki wrote: >> SATA: Blacklist systems that spin off disks during ACPI power off >> >> 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. >> >> Introduce a new libata flag ATA_FLAG_NO_POWEROFF_SPINDOWN that, if >> set, will prevent disks from being spun off during system power off >> and hibernation (to handle the hibernation case we need a new system >> state SYSTEM_HIBERNATE_ENTER that can be checked against by libata, >> in analogy with SYSTEM_POWER_OFF). Use dmi_first_match() to set this >> flag for some systems affected by the problem described above (HP nx6325, >> HP nx6310, HP 2510p). >> >> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> > > libata part looks good to me but I think it would be better to > separate out DMI changes into a separate patch.
Did these changes ever get separated out?
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