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Subject[PATCH -v12 15/15] PCI: Don't shrink too much for hotplug bridge
Date
Otherwise may have problem later if we plug pcie cards with bridges.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
drivers/pci/probe.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 118fe5b..f66f1b1 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -811,6 +811,7 @@ static int __devinit pci_bridge_check_busn_broken(struct pci_bus *bus,

static unsigned int __devinit __pci_scan_child_bus(struct pci_bus *bus,
int pass);
+#define HOTPLUG_BRIDGE_RESERVE_BUSNR 8
/*
* 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
@@ -1019,6 +1020,11 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max,
/*
* Set the subordinate bus number to its real value.
*/
+ if (dev->is_hotplug_bridge && child->busn_res.end > max &&
+ (max - child->busn_res.start) < HOTPLUG_BRIDGE_RESERVE_BUSNR)
+ max = min_t(int, child->busn_res.start +
+ HOTPLUG_BRIDGE_RESERVE_BUSNR,
+ child->busn_res.end);
shrink_size = (int)child->busn_res.end - max;
pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
pci_bus_update_busn_res_end(child, max);
--
1.7.7


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