linux-kernel - Re: [PATCH v1 1/2] ACPI, PCI: remove unused global list acpi_pci_roots in pci

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Date:	Wed, 29 May 2013 01:21:08 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Jiang Liu <liuj97@...il.com>, Yinghai Lu <yinghai@...nel.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	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-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v1 1/2] ACPI, PCI: remove unused global list acpi_pci_roots in pci_root.c

On Tuesday, May 28, 2013 04:37:03 PM Bjorn Helgaas wrote:
> On Tue, May 14, 2013 at 7:00 AM, Jiang Liu <liuj97@...il.com> wrote:
> > Now the global list acpi_pci_roots pci_root.c is useless, remove it.
> >
> > 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(-)
> 
> This and the "use acpi_handle_print()" patch look fine to me.
> 
> Rafael, I can take them, or if you want to take them yourself, you can add
> 
>   Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

OK, I'll take them.

Thanks,
Rafael


> > 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;
> > --
> > 1.8.1.2
> >
-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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