On Tue, Sep 18, 2012 at 12:24 AM, Taku Izumi <izumi.taku@xxxxxxxxxxxxxx> wrote:
>
> Use mutex to protect acpi_pci_roots list against PCI host bridge
> hotplug operations.
>
> Signed-off-by: Taku Izumi <izumi.taku@xxxxxxxxxxxxxx>
> ---
> drivers/acpi/pci_root.c | 27 ++++++++++++++++++---------
> 1 file changed, 18 insertions(+), 9 deletions(-)
>
> Index: Bjorn-next-0903/drivers/acpi/pci_root.c
> ===================================================================
> --- Bjorn-next-0903.orig/drivers/acpi/pci_root.c
> +++ Bjorn-next-0903/drivers/acpi/pci_root.c
> @@ -112,12 +112,17 @@ EXPORT_SYMBOL(acpi_pci_unregister_driver
> acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
> {
> struct acpi_pci_root *root;
> + struct acpi_handle *handle = NULL;
This should be "acpi_handle handle", not "struct acpi_handle *handle".
> + mutex_lock(&acpi_pci_root_lock);
> list_for_each_entry(root, &acpi_pci_roots, node)
> if ((root->segment == (u16) seg) &&
> - (root->secondary.start == (u16) bus))
> - return root->device->handle;
> - return NULL;
> + (root->secondary.start == (u16) bus)) {
> + handle = root->device->handle;
> + break;
> + }
> + mutex_unlock(&acpi_pci_root_lock);
> + return handle;
> }
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