diff options
Diffstat (limited to 'drivers/pci/probe.c')
| -rw-r--r-- | drivers/pci/probe.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 380d46dc9a70..93f280df3428 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -16,6 +16,7 @@ #include <linux/aer.h> #include <linux/acpi.h> #include <linux/irqdomain.h> +#include <linux/pm_runtime.h> #include "pci.h" #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */ @@ -832,6 +833,12 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) u8 primary, secondary, subordinate; int broken = 0; + /* + * Make sure the bridge is powered on to be able to access config + * space of devices below it. + */ + pm_runtime_get_sync(&dev->dev); + pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses); primary = buses & 0xFF; secondary = (buses >> 8) & 0xFF; @@ -1012,6 +1019,8 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) out: pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl); + pm_runtime_put(&dev->dev); + return max; } EXPORT_SYMBOL(pci_scan_bridge); @@ -2077,6 +2086,15 @@ unsigned int pci_scan_child_bus(struct pci_bus *bus) } /* + * Make sure a hotplug bridge has at least the minimum requested + * number of buses. + */ + if (bus->self && bus->self->is_hotplug_bridge && pci_hotplug_bus_size) { + if (max - bus->busn_res.start < pci_hotplug_bus_size - 1) + max = bus->busn_res.start + pci_hotplug_bus_size - 1; + } + + /* * We've scanned the bus and so we know all about what's on * the other side of any bridges that may be on this bus plus * any devices. |