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Date: Tue, 10 Jun 2014 22:51:51 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Linux PCI <linux-pci@...r.kernel.org>
Subject: [PATCH] ACPI / hotplug / PCI: Add hotplug contexts to PCI host bridges
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
After relatively recent changes in the ACPI-based PCI hotplug
(ACPIPHP) code, the acpiphp_check_host_bridge() executed for PCI
host bridges via acpi_pci_root_scan_dependent() doesn't do anything
useful, because those bridges do not have hotplug contexts. That
happens by mistake, so fix it by making acpiphp_enumerate_slots()
add hotplug contexts to PCI host bridges too and modify
acpiphp_remove_slots() to drop those contexts for host bridges
as appropriate.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=76901
Fixes: 2d8b1d566a5f (ACPI / hotplug / PCI: Get rid of check_sub_bridges())
Reported-and-tested-by: Gavin Guo <gavin.guo@...onical.com>
Cc: 3.15+ <stable@...r.kernel.org> # 3.15+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
drivers/pci/hotplug/acpiphp.h | 10 ++++++
drivers/pci/hotplug/acpiphp_glue.c | 60 +++++++++++++++++++++++++------------
2 files changed, 52 insertions(+), 18 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
@@ -373,17 +373,13 @@ static acpi_status acpiphp_add_context(a
static struct acpiphp_bridge *acpiphp_dev_to_bridge(struct acpi_device *adev)
{
- struct acpiphp_context *context;
struct acpiphp_bridge *bridge = NULL;
acpi_lock_hp_context();
- context = acpiphp_get_context(adev);
- if (context) {
- bridge = context->bridge;
+ if (adev->hp) {
+ bridge = to_acpiphp_root_context(adev->hp)->root_bridge;
if (bridge)
get_bridge(bridge);
-
- acpiphp_put_context(context);
}
acpi_unlock_hp_context();
return bridge;
@@ -881,7 +877,17 @@ void acpiphp_enumerate_slots(struct pci_
*/
get_device(&bus->dev);
- if (!pci_is_root_bus(bridge->pci_bus)) {
+ acpi_lock_hp_context();
+ if (pci_is_root_bus(bridge->pci_bus)) {
+ struct acpiphp_root_context *root_context;
+
+ root_context = kzalloc(sizeof(*root_context), GFP_KERNEL);
+ if (!root_context)
+ goto err;
+
+ root_context->root_bridge = bridge;
+ acpi_set_hp_context(adev, &root_context->hp, NULL, NULL, NULL);
+ } else {
struct acpiphp_context *context;
/*
@@ -890,21 +896,16 @@ void acpiphp_enumerate_slots(struct pci_
* parent is going to be handled by pciehp, in which case this
* bridge is not interesting to us either.
*/
- acpi_lock_hp_context();
context = acpiphp_get_context(adev);
- if (!context) {
- acpi_unlock_hp_context();
- put_device(&bus->dev);
- pci_dev_put(bridge->pci_dev);
- kfree(bridge);
- return;
- }
+ if (!context)
+ goto err;
+
bridge->context = context;
context->bridge = bridge;
/* Get a reference to the parent bridge. */
get_bridge(context->func.parent);
- acpi_unlock_hp_context();
}
+ acpi_unlock_hp_context();
/* Must be added to the list prior to calling acpiphp_add_context(). */
mutex_lock(&bridge_mutex);
@@ -919,6 +920,30 @@ void acpiphp_enumerate_slots(struct pci_
cleanup_bridge(bridge);
put_bridge(bridge);
}
+ return;
+
+ err:
+ acpi_unlock_hp_context();
+ put_device(&bus->dev);
+ pci_dev_put(bridge->pci_dev);
+ kfree(bridge);
+}
+
+void acpiphp_drop_bridge(struct acpiphp_bridge *bridge)
+{
+ if (pci_is_root_bus(bridge->pci_bus)) {
+ struct acpiphp_root_context *root_context;
+ struct acpi_device *adev;
+
+ acpi_lock_hp_context();
+ adev = ACPI_COMPANION(bridge->pci_bus->bridge);
+ root_context = to_acpiphp_root_context(adev->hp);
+ adev->hp = NULL;
+ acpi_unlock_hp_context();
+ kfree(root_context);
+ }
+ cleanup_bridge(bridge);
+ put_bridge(bridge);
}
/**
@@ -936,8 +961,7 @@ void acpiphp_remove_slots(struct pci_bus
list_for_each_entry(bridge, &bridge_list, list)
if (bridge->pci_bus == bus) {
mutex_unlock(&bridge_mutex);
- cleanup_bridge(bridge);
- put_bridge(bridge);
+ acpiphp_drop_bridge(bridge);
return;
}
Index: linux-pm/drivers/pci/hotplug/acpiphp.h
===================================================================
--- linux-pm.orig/drivers/pci/hotplug/acpiphp.h
+++ linux-pm/drivers/pci/hotplug/acpiphp.h
@@ -142,6 +142,16 @@ static inline acpi_handle func_to_handle
return func_to_acpi_device(func)->handle;
}
+struct acpiphp_root_context {
+ struct acpi_hotplug_context hp;
+ struct acpiphp_bridge *root_bridge;
+};
+
+static inline struct acpiphp_root_context *to_acpiphp_root_context(struct acpi_hotplug_context *hp)
+{
+ return container_of(hp, struct acpiphp_root_context, hp);
+}
+
/*
* struct acpiphp_attention_info - device specific attention registration
*
--
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