On Sunday, March 10, 2013 10:05:16 PM Yinghai Lu wrote:
> During merging pci tree with pm/acpi tree, Linus noticed that
> we don't have same lock using patten about acpi pci root as
> acpiphp.
>
> Here apply same lock patten, and we need to change
> acpi_bus_hot_remove_device executing via acpi_os_hotplug_execute()
> as it also hold the lock in acpi_bus_hot_remove_device.
>
> That will make acpi_bus_hot_remove_device calling the same as other
> callers.
>
> Reported-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
> Acked-by: Rafael J. Wysocki <rjw@xxxxxxx>
Bjorn, this needs to go in before final 3.9.
Are you going to handle it, or should I take care of it?
Rafael
> ---
> drivers/acpi/pci_root.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> Index: linux-2.6/drivers/acpi/pci_root.c
> ===================================================================
> --- linux-2.6.orig/drivers/acpi/pci_root.c
> +++ linux-2.6/drivers/acpi/pci_root.c
> @@ -646,6 +646,7 @@ static void handle_root_bridge_insertion
>
> static void handle_root_bridge_removal(struct acpi_device *device)
> {
> + acpi_status status;
> struct acpi_eject_event *ej_event;
>
> ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
> @@ -661,7 +662,9 @@ static void handle_root_bridge_removal(s
> ej_event->device = device;
> ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
>
> - acpi_bus_hot_remove_device(ej_event);
> + status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
> + if (ACPI_FAILURE(status))
> + kfree(ej_event);
> }
>
> static void _handle_hotplug_event_root(struct work_struct *work)
> @@ -676,8 +679,9 @@ static void _handle_hotplug_event_root(s
> handle = hp_work->handle;
> type = hp_work->type;
>
> - root = acpi_pci_find_root(handle);
> + acpi_scan_lock_acquire();
>
> + root = acpi_pci_find_root(handle);
> acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
>
> switch (type) {
> @@ -711,6 +715,7 @@ static void _handle_hotplug_event_root(s
> break;
> }
>
> + acpi_scan_lock_release();
> kfree(hp_work); /* allocated in handle_hotplug_event_bridge */
> kfree(buffer.pointer);
> }
> --
> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
