[PATCH 12/23] PCI: Strict checking of valid range for bridge

Yinghai Lu
2012-02-24T10:24:48Z

children bridges busn range should be able to be allocated from parent bus range.

to avoid overlapping between sibling bridges on same bus.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
drivers/pci/probe.c | 24 ++++++++++++++++++++++++
1 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index ee10c44..19aa415 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -770,6 +770,30 @@ reduce_needed_size:
return ret;
}

+static int __devinit pci_bridge_check_busn_broken(struct pci_bus *bus,
+ struct pci_dev *dev,
+ int secondary, int subordinate)
+{
+ int broken = 0;
+
+ struct resource busn_res;
+ int ret;
+
+ memset(&busn_res, 0, sizeof(struct resource));
+ dev_printk(KERN_DEBUG, &dev->dev,
+ "check if busn %02x-%02x is in busn_res: %pR\n",
+ secondary, subordinate, &bus->busn_res);
+ ret = allocate_resource(&bus->busn_res, &busn_res,
+ (subordinate - secondary + 1),
+ secondary, subordinate,
+ 1, NULL, NULL);
+ if (ret)
+ broken = 1;
+ else
+ release_resource(&busn_res);
+
+ return broken;
+}
/*
* If it's a bridge, configure it and scan the bus behind it.
* For CardBus bridges, we don't scan behind as the devices will
--
1.7.7