On Sat, 2013-01-26 at 15:19 -0800, Yinghai Lu wrote:
> On Sat, Jan 26, 2013 at 2:41 PM, Rafael J. Wysocki <rjw@xxxxxxx> wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> >
> > There is no guarantee that acpi_bus_scan() and acpi_bus_trim() will
> > not be run in parallel for the same scope of the ACPI namespace,
> > which may lead to a great deal of confusion, so introduce a new mutex
> > to prevent that from happening.
> >
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>
> Acked-by: Yinghai Lu <yinghai@xxxxxxxxxx>
>
> Steven,
>
> Can you apply this one to for-pci-res-alloc to check if racing with
> docking hotplug/eject
> still happen?
> or wait one or two days after i rebase that branch.
>
Still get the corrupt acpi_handle.
> Thanks
>
> Yinghai
>
> > ---
> > drivers/acpi/scan.c | 16 ++++++++++++----
> > 1 file changed, 12 insertions(+), 4 deletions(-)
> >
> > Index: linux-pm/drivers/acpi/scan.c
> > ===================================================================
> > --- linux-pm.orig/drivers/acpi/scan.c
> > +++ linux-pm/drivers/acpi/scan.c
> > @@ -52,6 +52,7 @@ static const struct acpi_device_id acpi_
> >
> > static LIST_HEAD(acpi_device_list);
> > static LIST_HEAD(acpi_bus_id_list);
> > +static DEFINE_MUTEX(acpi_scan_lock);
> > DEFINE_MUTEX(acpi_device_lock);
> > LIST_HEAD(acpi_wakeup_device_list);
> >
> > @@ -1612,19 +1613,22 @@ static acpi_status acpi_bus_device_attac
> > int acpi_bus_scan(acpi_handle handle)
> > {
> > void *device = NULL;
> > + int error = 0;
> > +
> > + mutex_lock(&acpi_scan_lock);
> >
> > if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
> > acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
> > acpi_bus_check_add, NULL, NULL, &device);
> >
> > if (!device)
> > - return -ENODEV;
> > -
> > - if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
> > + error = -ENODEV;
> > + else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
> > acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
> > acpi_bus_device_attach, NULL, NULL, NULL);
> >
> > - return 0;
> > + mutex_unlock(&acpi_scan_lock);
> > + return error;
> > }
> > EXPORT_SYMBOL(acpi_bus_scan);
> >
> > @@ -1653,6 +1657,8 @@ static acpi_status acpi_bus_remove(acpi_
> >
> > void acpi_bus_trim(struct acpi_device *start)
> > {
> > + mutex_lock(&acpi_scan_lock);
> > +
> > /*
> > * Execute acpi_bus_device_detach() as a post-order callback to detach
> > * all ACPI drivers from the device nodes being removed.
> > @@ -1667,6 +1673,8 @@ void acpi_bus_trim(struct acpi_device *s
> > acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
> > acpi_bus_remove, NULL, NULL);
> > acpi_bus_remove(start->handle, 0, NULL, NULL);
> > +
> > + mutex_unlock(&acpi_scan_lock);
> > }
> > EXPORT_SYMBOL_GPL(acpi_bus_trim);
> >
> >
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