linux-kernel - Re: [PATCH v2, part 1 5/9] ACPI, PCI: remove unused global list acpi_pci_roots in pci

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Message-ID: <1598495.v92I2Ljz9W@vostro.rjw.lan>
Date:	Tue, 14 May 2013 01:28:45 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Gu Zheng <guz.fnst@...fujitsu.com>,
	Toshi Kani <toshi.kani@...com>,
	Myron Stowe <myron.stowe@...hat.com>,
	Yijing Wang <wangyijing@...wei.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Len Brown <lenb@...nel.org>,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2, part 1 5/9] ACPI, PCI: remove unused global list acpi_pci_roots in pci_root.c

On Tuesday, May 14, 2013 12:08:29 AM Jiang Liu wrote:
> Now the global list acpi_pci_roots pci_root.c is useless, remove it.

Well, are patches [1-4/9] needed for that or does it apply without them?

Rafael


> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
> Cc: Len Brown <lenb@...nel.org>
> Cc: "Rafael J. Wysocki" <rjw@...k.pl>
> Cc: linux-acpi@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  drivers/acpi/pci_root.c | 25 +++----------------------
>  include/acpi/acpi_bus.h |  1 -
>  2 files changed, 3 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> index b80e06e..91ddfd6 100644
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -65,10 +65,6 @@ static struct acpi_scan_handler pci_root_handler = {
>  	.detach = acpi_pci_root_remove,
>  };
>  
> -/* Lock to protect both acpi_pci_roots lists */
> -static DEFINE_MUTEX(acpi_pci_root_lock);
> -static LIST_HEAD(acpi_pci_roots);
> -
>  static DEFINE_MUTEX(osc_lock);
>  
>  /**
> @@ -423,7 +419,6 @@ static int acpi_pci_root_add(struct acpi_device *device,
>  		}
>  	}
>  
> -	INIT_LIST_HEAD(&root->node);
>  	root->device = device;
>  	root->segment = segment & 0xFFFF;
>  	strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
> @@ -501,10 +496,6 @@ static int acpi_pci_root_add(struct acpi_device *device,
>  	 * TBD: Need PCI interface for enumeration/configuration of roots.
>  	 */
>  
> -	mutex_lock(&acpi_pci_root_lock);
> -	list_add_tail(&root->node, &acpi_pci_roots);
> -	mutex_unlock(&acpi_pci_root_lock);
> -
>  	/*
>  	 * Scan the Root Bridge
>  	 * --------------------
> @@ -518,7 +509,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
>  			    "Bus %04x:%02x not present in PCI namespace\n",
>  			    root->segment, (unsigned int)root->secondary.start);
>  		result = -ENODEV;
> -		goto out_del_root;
> +		goto end;
>  	}
>  
>  	/* ASPM setting */
> @@ -538,20 +529,13 @@ static int acpi_pci_root_add(struct acpi_device *device,
>  	if (system_state != SYSTEM_BOOTING) {
>  		pcibios_resource_survey_bus(root->bus);
>  		pci_assign_unassigned_bus_resources(root->bus);
> -	}
> -
> -	/* need to after hot-added ioapic is registered */
> -	if (system_state != SYSTEM_BOOTING)
> +		/* need to after hot-added ioapic is registered */
>  		pci_enable_bridges(root->bus);
> +	}
>  
>  	pci_bus_add_devices(root->bus);
>  	return 1;
>  
> -out_del_root:
> -	mutex_lock(&acpi_pci_root_lock);
> -	list_del(&root->node);
> -	mutex_unlock(&acpi_pci_root_lock);
> -
>  end:
>  	kfree(root);
>  	return result;
> @@ -568,9 +552,6 @@ static void acpi_pci_root_remove(struct acpi_device *device)
>  
>  	pci_remove_root_bus(root->bus);
>  
> -	mutex_lock(&acpi_pci_root_lock);
> -	list_del(&root->node);
> -	mutex_unlock(&acpi_pci_root_lock);
>  	kfree(root);
>  }
>  
> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> index 22ba56e..4eb9a88 100644
> --- a/include/acpi/acpi_bus.h
> +++ b/include/acpi/acpi_bus.h
> @@ -447,7 +447,6 @@ int register_acpi_bus_type(struct acpi_bus_type *);
>  int unregister_acpi_bus_type(struct acpi_bus_type *);
>  
>  struct acpi_pci_root {
> -	struct list_head node;
>  	struct acpi_device * device;
>  	struct pci_bus *bus;
>  	u16 segment;
> 
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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