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Date: Fri, 01 Mar 2013 00:37:33 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Yinghai Lu <yinghai@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>, linux-usb@...r.kernel.org,
Tejun Heo <tj@...nel.org>, linux-ide@...r.kernel.org,
Jeff Garzik <jgarzik@...ox.com>
Subject: Re: [PATCH 1/2] ACPI / glue: Add .match() callback to struct acpi_bus_type
On Thursday, February 28, 2013 02:29:56 PM Yinghai Lu wrote:
> On Thu, Feb 28, 2013 at 1:53 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> >
> > USB uses the .find_bridge() callback from struct acpi_bus_type
> > incorrectly, because as a result of the way it is used by USB every
> > device in the system that doesn't have a bus type or parent is
> > passed to usb_acpi_find_device() for inspection.
> >
> > What USB actually needs, though, is to call usb_acpi_find_device()
> > for USB ports that don't have a bus type defined, but have
> > usb_port_device_type as their device type, as well as for USB
> > devices.
> >
> > To fix that replace the struct bus_type pointer in struct
> > acpi_bus_type used for matching devices to specific subsystems
> > with a .match() callback to be used for this purpose and update
> > the users of struct acpi_bus_type, including USB, accordingly.
> > Define the .match() callback routine for USB, usb_acpi_bus_match(),
> > in such a way that it will cover both USB devices and USB ports
> > and remove the now redundant .find_bridge() callback pointer from
> > usb_acpi_bus.
> >
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > ---
> > drivers/acpi/glue.c | 39 +++++++++++++--------------------------
> > drivers/ata/libata-acpi.c | 1 +
> > drivers/pci/pci-acpi.c | 8 +++++++-
> > drivers/pnp/pnpacpi/core.c | 8 +++++++-
> > drivers/scsi/scsi_lib.c | 7 ++++++-
> > drivers/usb/core/usb-acpi.c | 9 +++++++--
> > include/acpi/acpi_bus.h | 3 ++-
> > 7 files changed, 43 insertions(+), 32 deletions(-)
> >
> > Index: linux-pm/include/acpi/acpi_bus.h
> > ===================================================================
> > --- linux-pm.orig/include/acpi/acpi_bus.h
> > +++ linux-pm/include/acpi/acpi_bus.h
> > @@ -437,7 +437,8 @@ void acpi_remove_dir(struct acpi_device
> > */
> > struct acpi_bus_type {
> > struct list_head list;
> > - struct bus_type *bus;
> > + const char *name;
> > + bool (*match)(struct device *dev);
> > /* For general devices under the bus */
> > int (*find_device) (struct device *, acpi_handle *);
> > /* For bridges, such as PCI root bridge, IDE controller */
> > Index: linux-pm/drivers/acpi/glue.c
> > ===================================================================
> > --- linux-pm.orig/drivers/acpi/glue.c
> > +++ linux-pm/drivers/acpi/glue.c
> > @@ -36,12 +36,11 @@ int register_acpi_bus_type(struct acpi_b
> > {
> > if (acpi_disabled)
> > return -ENODEV;
> > - if (type && type->bus && type->find_device) {
> > + if (type && type->match && type->find_device) {
> > down_write(&bus_type_sem);
> > list_add_tail(&type->list, &bus_type_list);
> > up_write(&bus_type_sem);
> > - printk(KERN_INFO PREFIX "bus type %s registered\n",
> > - type->bus->name);
> > + printk(KERN_INFO PREFIX "bus type %s registered\n", type->name);
> > return 0;
> > }
> > return -ENODEV;
> > @@ -56,24 +55,21 @@ int unregister_acpi_bus_type(struct acpi
> > down_write(&bus_type_sem);
> > list_del_init(&type->list);
> > up_write(&bus_type_sem);
> > - printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
> > - type->bus->name);
> > + printk(KERN_INFO PREFIX "bus type %s unregistered\n",
> > + type->name);
> > return 0;
> > }
> > return -ENODEV;
> > }
> > EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
> >
> > -static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
> > +static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
> > {
> > struct acpi_bus_type *tmp, *ret = NULL;
> >
> > - if (!type)
> > - return NULL;
> > -
> > down_read(&bus_type_sem);
> > list_for_each_entry(tmp, &bus_type_list, list) {
> > - if (tmp->bus == type) {
> > + if (tmp->match(dev)) {
> > ret = tmp;
> > break;
> > }
> > @@ -261,26 +257,17 @@ err:
> >
> > static int acpi_platform_notify(struct device *dev)
> > {
> > - struct acpi_bus_type *type;
> > + struct acpi_bus_type *type = acpi_get_bus_type(dev);
> > acpi_handle handle;
> > int ret;
> >
> > ret = acpi_bind_one(dev, NULL);
> > - if (ret && (!dev->bus || !dev->parent)) {
> > - /* bridge devices genernally haven't bus or parent */
> > - ret = acpi_find_bridge_device(dev, &handle);
> > - if (!ret) {
> > - ret = acpi_bind_one(dev, handle);
> > - if (ret)
> > - goto out;
> > - }
> > - }
> > -
> > - type = acpi_get_bus_type(dev->bus);
> > if (ret) {
> > - if (!type || !type->find_device) {
> > - DBG("No ACPI bus support for %s\n", dev_name(dev));
> > - ret = -EINVAL;
> > + if (!type) {
> > + ret = acpi_find_bridge_device(dev, &handle);
> > + if (!ret)
> > + ret = acpi_bind_one(dev, handle);
> > +
> > goto out;
> > }
> >
> > @@ -316,7 +303,7 @@ static int acpi_platform_notify_remove(s
> > {
> > struct acpi_bus_type *type;
> >
> > - type = acpi_get_bus_type(dev->bus);
> > + type = acpi_get_bus_type(dev);
> > if (type && type->cleanup)
> > type->cleanup(dev);
> >
> > Index: linux-pm/drivers/scsi/scsi_lib.c
> > ===================================================================
> > --- linux-pm.orig/drivers/scsi/scsi_lib.c
> > +++ linux-pm/drivers/scsi/scsi_lib.c
> > @@ -71,9 +71,14 @@ struct kmem_cache *scsi_sdb_cache;
> > #ifdef CONFIG_ACPI
> > #include <acpi/acpi_bus.h>
> >
> > +static bool acpi_scsi_bus_match(struct device *dev)
> > +{
> > + return dev->bus == &scsi_bus_type;
> > +}
> > +
> > int scsi_register_acpi_bus_type(struct acpi_bus_type *bus)
> > {
> > - bus->bus = &scsi_bus_type;
> > + bus->match = acpi_scsi_bus_match;
> > return register_acpi_bus_type(bus);
> > }
> > EXPORT_SYMBOL_GPL(scsi_register_acpi_bus_type);
> > Index: linux-pm/drivers/pci/pci-acpi.c
> > ===================================================================
> > --- linux-pm.orig/drivers/pci/pci-acpi.c
> > +++ linux-pm/drivers/pci/pci-acpi.c
> > @@ -331,8 +331,14 @@ static void pci_acpi_cleanup(struct devi
> > }
> > }
> >
> > +static bool pci_acpi_bus_match(struct device *dev)
> > +{
> > + return dev->bus == &pci_bus_type;
> > +}
> > +
> > static struct acpi_bus_type acpi_pci_bus = {
> > - .bus = &pci_bus_type,
> > + .name = "PCI",
> > + .match = pci_acpi_bus_match,
> > .find_device = acpi_pci_find_device,
> > .setup = pci_acpi_setup,
> > .cleanup = pci_acpi_cleanup,
> > Index: linux-pm/drivers/pnp/pnpacpi/core.c
> > ===================================================================
> > --- linux-pm.orig/drivers/pnp/pnpacpi/core.c
> > +++ linux-pm/drivers/pnp/pnpacpi/core.c
> > @@ -353,8 +353,14 @@ static int __init acpi_pnp_find_device(s
> > /* complete initialization of a PNPACPI device includes having
> > * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
> > */
> > +static bool acpi_pnp_bus_match(struct device *dev)
> > +{
> > + return dev->bus == &pnp_bus_type;
> > +}
> > +
> > static struct acpi_bus_type __initdata acpi_pnp_bus = {
> > - .bus = &pnp_bus_type,
> > + .name = "PNP",
> > + .match = acpi_pnp_bus_match,
> > .find_device = acpi_pnp_find_device,
> > };
> >
> > Index: linux-pm/drivers/usb/core/usb-acpi.c
> > ===================================================================
> > --- linux-pm.orig/drivers/usb/core/usb-acpi.c
> > +++ linux-pm/drivers/usb/core/usb-acpi.c
> > @@ -210,9 +210,14 @@ static int usb_acpi_find_device(struct d
> > return 0;
> > }
> >
> > +static bool usb_acpi_bus_match(struct device *dev)
> > +{
> > + return is_usb_device(dev) || is_usb_port(dev);
> > +}
> > +
> > static struct acpi_bus_type usb_acpi_bus = {
> > - .bus = &usb_bus_type,
> > - .find_bridge = usb_acpi_find_device,
> > + .name = "USB",
> > + .match = usb_acpi_bus_match,
> > .find_device = usb_acpi_find_device,
> > };
>
> yes, much clean.
>
> Don't need to add extra bus type for usb port device.
>
> For 1-2.
> Acked-by: Yinghai Lu <yinghai@...nel.org>
Thanks!
Rafael
> > Index: linux-pm/drivers/ata/libata-acpi.c
> > ===================================================================
> > --- linux-pm.orig/drivers/ata/libata-acpi.c
> > +++ linux-pm/drivers/ata/libata-acpi.c
> > @@ -1150,6 +1150,7 @@ static int ata_acpi_find_dummy(struct de
> > }
> >
> > static struct acpi_bus_type ata_acpi_bus = {
> > + .name = "ATA",
> > .find_bridge = ata_acpi_find_dummy,
> > .find_device = ata_acpi_find_device,
> > };
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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