lkml.org 
[lkml]   [2012]   [Sep]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH part3 03/11] PCI: pci_bus_size_bridges() should not size own bridge
Date
During checking acpiphp code, found following sequence:
pci_bus_size_bridges(bus);
pci_bus_assign_resources(bus);
pci_enable_bridges(bus);

The problem is that when bus is not root bus, pci_bus_size_bridges would also size
own pci bridge bus->self if that bridge resource is not inserted before.
but later pci_bus_assign_resources will not allocate those size bridge res.

So try make it less confusing, let it does not include self sizing.
and add with_self parameter info __pci_bus_size_bridge()

Fixes caller in pci hotplug componets.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
drivers/pci/hotplug/acpiphp_glue.c | 3 ++-
drivers/pci/setup-bus.c | 24 +++++++++++++++---------
include/linux/pci.h | 1 +
3 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 085eec7..6cb1923 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -842,7 +842,8 @@ static int __ref enable_device(struct acpiphp_slot *slot)
max = pci_scan_bridge(bus, dev, max, pass);
if (pass && dev->subordinate) {
check_hotplug_bridge(slot, dev);
- pci_bus_size_bridges(dev->subordinate);
+ pci_bus_size_bridges_with_self(
+ dev->subordinate);
}
}
}
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 1dc22b3..70d6292 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1005,8 +1005,8 @@ handle_done:
;
}

-void __ref __pci_bus_size_bridges(struct pci_bus *bus,
- struct list_head *realloc_head)
+static void __ref __pci_bus_size_bridges(struct pci_bus *bus,
+ struct list_head *realloc_head, bool with_self)
{
struct pci_dev *dev;
unsigned long mask, prefmask;
@@ -1024,13 +1024,13 @@ void __ref __pci_bus_size_bridges(struct pci_bus *bus,

case PCI_CLASS_BRIDGE_PCI:
default:
- __pci_bus_size_bridges(b, realloc_head);
+ __pci_bus_size_bridges(b, realloc_head, true);
break;
}
}

- /* The root bus? */
- if (!bus->self)
+ /* Is root bus or not wanted? */
+ if (!bus->self || !with_self)
return;

switch (bus->self->class >> 8) {
@@ -1070,9 +1070,15 @@ void __ref __pci_bus_size_bridges(struct pci_bus *bus,
}
}

+void __ref pci_bus_size_bridges_with_self(struct pci_bus *bus)
+{
+ __pci_bus_size_bridges(bus, NULL, true);
+}
+EXPORT_SYMBOL(pci_bus_size_bridges_with_self);
+
void __ref pci_bus_size_bridges(struct pci_bus *bus)
{
- __pci_bus_size_bridges(bus, NULL);
+ __pci_bus_size_bridges(bus, NULL, false);
}
EXPORT_SYMBOL(pci_bus_size_bridges);

@@ -1385,7 +1391,7 @@ again:
/* Depth first, calculate sizes and alignments of all
subordinate buses. */
list_for_each_entry(bus, &pci_root_buses, node)
- __pci_bus_size_bridges(bus, add_list);
+ __pci_bus_size_bridges(bus, add_list, false);

/* Depth last, allocate resources and update the hardware. */
list_for_each_entry(bus, &pci_root_buses, node)
@@ -1462,7 +1468,7 @@ void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
IORESOURCE_PREFETCH;

again:
- __pci_bus_size_bridges(parent, &add_list);
+ __pci_bus_size_bridges(parent, &add_list, true);
__pci_bridge_assign_resources(bridge, &add_list, &fail_head);
BUG_ON(!list_empty(&add_list));
tried_times++;
@@ -1523,7 +1529,7 @@ void pci_assign_unassigned_bus_resources(struct pci_bus *bus)
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
if (dev->subordinate)
__pci_bus_size_bridges(dev->subordinate,
- &add_list);
+ &add_list, true);
up_read(&pci_bus_sem);
__pci_bus_assign_resources(bus, &add_list, NULL);
BUG_ON(!list_empty(&add_list));
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 1bd7559..f994e93 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -980,6 +980,7 @@ int pci_vpd_truncate(struct pci_dev *dev, size_t size);
resource_size_t pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx);
void pci_bus_assign_resources(const struct pci_bus *bus);
void pci_bus_size_bridges(struct pci_bus *bus);
+void pci_bus_size_bridges_with_self(struct pci_bus *bus);
int pci_claim_resource(struct pci_dev *, int);
void pci_assign_unassigned_resources(void);
void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge);
--
1.7.7


\
 
 \ /
  Last update: 2012-09-03 00:41    [W:0.922 / U:0.776 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site