linux-kernel - Re: sata_nv does not function in kernel

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Message-ID: <4785A1CF.7050006@garzik.org>
Date:	Wed, 09 Jan 2008 23:40:47 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Matthew Hall <mhall@...omputing.net>
CC:	linux-scsi@...r.kernel.org,
	IDE/ATA development list <linux-ide@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: sata_nv does not function in kernel > 2.6.20.21

Matthew Hall wrote:
> ACPI: PCI Interrupt Link [LT3D] enabled at IRQ 46
> ACPI: PCI Interrupt 0000:80:07.0[A] -> Link [LT3D] -> GSI 46 (level,
> low) -> IRQ 46
> sata_nv 0000:80:07.0: Using ADMA mode
> PCI: Unable to reserve mem region #6:1000@...fe000 for device
> 0000:80:07.0
> ACPI: PCI interrupt for device 0000:80:07.0 disabled
> sata_nv: probe of 0000:80:07.0 failed with error -16
> ACPI: PCI Interrupt Link [LT2E] enabled at IRQ 45
> ACPI: PCI Interrupt 0000:80:08.0[A] -> Link [LT2E] -> GSI 45 (level,
> low) -> IRQ 45
> sata_nv 0000:80:08.0: Using ADMA mode
> PCI: Unable to reserve mem region #6:1000@...fd000 for device
> 0000:80:08.0
> ACPI: PCI interrupt for device 0000:80:08.0 disabled
> sata_nv: probe of 0000:80:08.0 failed with error -16

Error -16 is EBUSY, which causes the driver load to fail due to the 
"Unable to reserve mem region" message.

This means that the sata_nv driver needed to use PCI BAR 6, but was 
unable to for some reason.  Given that sata_nv uses devres like other 
libata drivers, IMO the likely cause is outside the ATA subsystem (PCI? 
ACPI?).

One workaround to try is setting sata_nv module option 'adma' to zero 
(0), in the hopes that it ignores that final region and work anyway.

	Jeff



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