2.6.31-rc6: ACPI handle has no context apparenty from libata during suspend to RAM

[Andrey Borzenkov <arvidjaar@mail.ru>]

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Even if messages is DEBUG, I assume condition is unusual (otherwise we 
would not need any message in the first place).

This is Dell XPS M1330 with ICH8M:

00:1f.1 IDE interface: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) 
IDE Controller (rev 02)                                                                 
        Subsystem: Dell Device 0209                                            
        Kernel driver in use: ata_piix                                         
        Kernel modules: ata_piix, pata_acpi, ata_generic, piix, ide-pci-
generic
00:1f.2 SATA controller: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) 
SATA AHCI Controller (rev 02)                                                         
        Subsystem: Dell Device 0209                                            
        Kernel driver in use: ahci                                             
        Kernel modules: ahci                                                   

Every time I do to sleep I get:

PM: Entering mem sleep
Suspending console(s) (use no_console_suspend to debug)
btusb_bulk_complete: hci0 urb ffff88005485d180 failed to resubmit (1)
btusb_bulk_complete: hci0 urb ffff880039086c00 failed to resubmit (1)
btusb_intr_complete: hci0 urb ffff880078556780 failed to resubmit (1)
sd 0:0:0:0: [sda] Synchronizing SCSI cache
sd 0:0:0:0: [sda] Stopping disk
ACPI handle has no context!
sdhci-pci 0000:03:01.1: PME# disabled
sdhci-pci 0000:03:01.1: PCI INT B disabled
ACPI handle has no context!
ata5: port disabled. ignoring.
ata_piix 0000:00:1f.1: PCI INT A disabled
ehci_hcd 0000:00:1d.7: PCI INT A disabled
...

Otherwise there are no negative effects as far as I can tell.

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