On Tue, Jun 10, 2014 at 2:51 PM, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote: > From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > > 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@xxxxxxxxxxxxx> > Cc: 3.15+ <stable@xxxxxxxxxxxxxxx> # 3.15+ > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> Rafael, do you want to merge this via your tree, since you merged the original acpiphp rework? I do have a small cleanup of acpiphp_glue.c in my queue, but it won't conflict with this. Thanks a lot for fixing this! Bjorn > --- > 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 > * > > -- > 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 -- 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
