[PATCH -v12 15/15] PCI: Don't shrink too much for hotplug bridge
From: Yinghai Lu <yinghai@kernel.org>
Date: 2012-06-26 18:56:22
Also in:
linux-pci, lkml
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
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