On Mon, Mar 09, 2015 at 10:34:00AM +0800, Yijing Wang wrote:
Export out busn_resource. Xen pcifront module need it.
Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx>
---
drivers/pci/pci.h | 2 ++
drivers/pci/probe.c | 3 ++-
2 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 4091f82..eeacab9 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -10,6 +10,8 @@ bool pcie_cap_has_lnkctl(const struct pci_dev *dev);
/* Functions internal to the PCI core code */
+extern struct resource busn_resource;
+
int pci_create_sysfs_dev_files(struct pci_dev *pdev);
void pci_remove_sysfs_dev_files(struct pci_dev *pdev);
#if !defined(CONFIG_DMI) && !defined(CONFIG_ACPI)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 8ef0375..b97ea81 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -17,12 +17,13 @@
#define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
#define CARDBUS_RESERVE_BUSNR 3
-static struct resource busn_resource = {
+struct resource busn_resource = {
.name = "PCI busn",
.start = 0,
.end = 255,
.flags = IORESOURCE_BUS,
};
+EXPORT_SYMBOL(busn_resource);
I don't think this is a good idea. We support multiple PCI domains, and
each domain has its own 0-255 bus number range. This busn_resource is
only for domain 0 and probably should be handled in arch code instead of
the PCI core.
Right now, I think it's possible to call pci_scan_bus_parented() or
pci_scan_bus() several times for buses in different domains, and they would
all share the same busn_resource, which would cause corruption.
So it's already broken, but I don't want to make it harder to fix by
exporting this stuff.
/* Ugh. Need to stop exporting this to modules. */
LIST_HEAD(pci_root_buses);
--
1.7.1
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