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author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-06-10 22:46:35 +0200 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-06-11 21:08:49 +0200 |
commit | 882d18a702c66404fcb62b84748f719f9b47441c (patch) | |
tree | 6421a39a71d751250afe3b19d8fcfceee792b864 /drivers | |
parent | 4dc4226f994db264c844a5fcf556935c66f963a5 (diff) | |
download | linux-882d18a702c66404fcb62b84748f719f9b47441c.tar.gz linux-882d18a702c66404fcb62b84748f719f9b47441c.tar.bz2 linux-882d18a702c66404fcb62b84748f719f9b47441c.zip |
ACPI / hotplug / PCI: Add hotplug contexts to PCI host bridges
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@canonical.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: 3.15+ <stable@vger.kernel.org> # 3.15+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/pci/hotplug/acpiphp.h | 10 | ||||
-rw-r--r-- | drivers/pci/hotplug/acpiphp_glue.c | 60 |
2 files changed, 52 insertions, 18 deletions
diff --git a/drivers/pci/hotplug/acpiphp.h b/drivers/pci/hotplug/acpiphp.h index 2b859249303b..b0e61bf261a7 100644 --- a/drivers/pci/hotplug/acpiphp.h +++ b/drivers/pci/hotplug/acpiphp.h @@ -142,6 +142,16 @@ static inline acpi_handle func_to_handle(struct acpiphp_func *func) 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 * diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index 75e178330215..91aa3d780138 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -373,17 +373,13 @@ static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data, 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_bus *bus) */ 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_bus *bus) * 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_bus *bus) 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 *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; } |