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Date: Wed, 17 Jul 2013 18:40:10 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
LKML <linux-kernel@...r.kernel.org>,
Linux PCI <linux-pci@...r.kernel.org>,
Jiang Liu <liuj97@...il.com>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH 2/30] ACPI / hotplug / PCI: Consolidate acpiphp_enumerate_slots()
On Wed, Jul 17, 2013 at 4:16 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> The acpiphp_enumerate_slots() function is now split into two parts,
> acpiphp_enumerate_slots() proper and init_bridge_misc() which is
> only called by the former. If these functions are combined,
> it is possible to make the code easier to follow and to clean up
> the error handling (to prevent memory leaks on error from
> happening in particular), so do that.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
> drivers/pci/hotplug/acpiphp_glue.c | 92 ++++++++++++++++++-------------------
> 1 file changed, 45 insertions(+), 47 deletions(-)
>
> Index: linux-pm/drivers/pci/hotplug/acpiphp_glue.c
> ===================================================================
> --- linux-pm.orig/drivers/pci/hotplug/acpiphp_glue.c
> +++ linux-pm/drivers/pci/hotplug/acpiphp_glue.c
> @@ -353,46 +353,6 @@ static int detect_ejectable_slots(acpi_h
> return found;
> }
>
> -/* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */
> -static void init_bridge_misc(struct acpiphp_bridge *bridge)
> -{
> - acpi_status status;
> -
> - /* must be added to the list prior to calling register_slot */
> - mutex_lock(&bridge_mutex);
> - list_add(&bridge->list, &bridge_list);
> - mutex_unlock(&bridge_mutex);
> -
> - /* register all slot objects under this bridge */
> - status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1,
> - register_slot, NULL, bridge, NULL);
> - if (ACPI_FAILURE(status)) {
> - mutex_lock(&bridge_mutex);
> - list_del(&bridge->list);
> - mutex_unlock(&bridge_mutex);
> - return;
> - }
> -
> - /* install notify handler for P2P bridges */
> - if (!pci_is_root_bus(bridge->pci_bus)) {
> - if ((bridge->flags & BRIDGE_HAS_EJ0) && bridge->func) {
> - status = acpi_remove_notify_handler(bridge->func->handle,
> - ACPI_SYSTEM_NOTIFY,
> - handle_hotplug_event_func);
> - if (ACPI_FAILURE(status))
> - err("failed to remove notify handler\n");
> - }
> - status = acpi_install_notify_handler(bridge->handle,
> - ACPI_SYSTEM_NOTIFY,
> - handle_hotplug_event_bridge,
> - bridge);
> -
> - if (ACPI_FAILURE(status)) {
> - err("failed to register interrupt notify handler\n");
> - }
> - }
> -}
> -
>
> /* find acpiphp_func from acpiphp_bridge */
> static struct acpiphp_func *acpiphp_bridge_handle_to_function(acpi_handle handle)
> @@ -1149,8 +1109,9 @@ static void handle_hotplug_event_func(ac
> */
> void acpiphp_enumerate_slots(struct pci_bus *bus)
> {
> - acpi_handle handle;
> struct acpiphp_bridge *bridge;
> + acpi_handle handle;
> + acpi_status status;
>
> if (acpiphp_disabled)
> return;
> @@ -1178,14 +1139,51 @@ void acpiphp_enumerate_slots(struct pci_
> */
> get_device(&bus->dev);
>
> - if (!pci_is_root_bus(bridge->pci_bus) &&
> - acpi_has_method(bridge->handle, "_EJ0")) {
> - dbg("found ejectable p2p bridge\n");
> - bridge->flags |= BRIDGE_HAS_EJ0;
> - bridge->func = acpiphp_bridge_handle_to_function(handle);
> + /* must be added to the list prior to calling register_slot */
> + mutex_lock(&bridge_mutex);
> + list_add(&bridge->list, &bridge_list);
> + mutex_unlock(&bridge_mutex);
> +
> + /* register all slot objects under this bridge */
> + status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, 1,
> + register_slot, NULL, bridge, NULL);
> + if (ACPI_FAILURE(status)) {
> + acpi_handle_err(bridge->handle, "failed to register slots\n");
> + goto err;
> + }
> +
> + if (pci_is_root_bus(bridge->pci_bus))
> + return;
> +
> + /* install notify handler for P2P bridges */
> + status = acpi_install_notify_handler(bridge->handle, ACPI_SYSTEM_NOTIFY,
> + handle_hotplug_event_bridge,
> + bridge);
> + if (ACPI_FAILURE(status)) {
> + acpi_handle_err(bridge->handle,
> + "failed to register notify handler\n");
> + goto err;
> }
>
> - init_bridge_misc(bridge);
> + if (!acpi_has_method(bridge->handle, "_EJ0"))
> + return;
> +
> + dbg("found ejectable p2p bridge\n");
> + bridge->flags |= BRIDGE_HAS_EJ0;
> + bridge->func = acpiphp_bridge_handle_to_function(bridge->handle);
> + if (bridge->func) {
> + status = acpi_remove_notify_handler(bridge->func->handle,
> + ACPI_SYSTEM_NOTIFY,
> + handle_hotplug_event_func);
> + if (ACPI_FAILURE(status))
> + acpi_handle_err(bridge->func->handle,
> + "failed to remove notify handler\n");
> + }
looks little weird that you change to install bridge notifier handler and remove
bridge func notifier handler.
actually these two handles is the same one.
I would prefer to keeping the old sequence.
Yinghai
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