linux-kernel - Re: [PATCH v4 0/13] SATA ZPODD support

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Message-ID: <20120530054310.GA11672@ladygaga>
Date:	Wed, 30 May 2012 13:43:10 +0800
From:	Aaron Lu <aaron.lu@....com>
To:	Lin Ming <ming.m.lin@...el.com>,
	Fuzhou Chen <fuzhouch@...rosoft.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jeff Garzik <jgarzik@...ox.com>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Holger Macht <holger@...ac.de>,
	Matthew Garrett <mjg@...hat.com>,
	<linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
	<linux-scsi@...r.kernel.org>, <linux-ide@...r.kernel.org>,
	<linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v4 0/13] SATA ZPODD support

On Tue, May 29, 2012 at 08:32:49PM +0800, Lin Ming wrote:
> On Mon, May 28, 2012 at 5:54 PM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> >> Have you fixed the fact that Matthews patches broke things like pata_acpi
> >> last time ? Until that is fixed properly I don't see that these patches
> >> can make any progress.
> >
> > https://lkml.org/lkml/2012/2/24/2
> 
> Aaron has a fix.
> We'll do more test.

Here is the patch, apply on top of the ZPODD patch set.

Hi Fuzhou,
Can you please give it a test? Thanks.
I tested on my system with a ATI IDE controller and it could work with
pata_acpi module.

diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index 6de8f32..c53266a 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -59,7 +59,18 @@ acpi_handle ata_ap_acpi_handle(struct ata_port *ap)
 {
 	if (ap->flags & ATA_FLAG_ACPI_SATA)
 		return NULL;
-	return DEVICE_ACPI_HANDLE(&ap->scsi_host->shost_gendev);
+
+	/*
+	 * If acpi bind operation has already happened, we can get the handle
+	 * for the port by checking the corresponding scsi_host device's
+	 * firmware node, otherwise we will need to find out the handle from
+	 * its parent's acpi node.
+	 */
+	if (ap->scsi_host)
+		return DEVICE_ACPI_HANDLE(&ap->scsi_host->shost_gendev);
+	else
+		return acpi_get_child(DEVICE_ACPI_HANDLE(ap->host->dev),
+				ap->port_no);
 }
 EXPORT_SYMBOL(ata_ap_acpi_handle);

-Aaron

> 
> Thanks for the info.
> Lin Ming
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