From: Kunwu Chan <chentao@xxxxxxxxxx>
Since commit d492cc2573a0 ("driver core: device.h: make struct
bus_type a const *"), the driver core can properly handle constant
struct bus_type, move the pci_bus_type variable to be a constant
structure as well, placing it into read-only memory which can not be
modified at runtime.
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Suggested-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Kunwu Chan <chentao@xxxxxxxxxx>
---
drivers/pci/pci-driver.c | 2 +-
include/linux/pci.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index f412ef73a6e4..35270172c833 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -1670,7 +1670,7 @@ static void pci_dma_cleanup(struct device *dev)
iommu_device_unuse_default_domain(dev);
}
-struct bus_type pci_bus_type = {
+const struct bus_type pci_bus_type = {
.name = "pci",
.match = pci_bus_match,
.uevent = pci_uevent,
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 4246cb790c7b..0d6c1c089aca 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1098,7 +1098,7 @@ enum pcie_bus_config_types {
extern enum pcie_bus_config_types pcie_bus_config;
-extern struct bus_type pci_bus_type;
+extern const struct bus_type pci_bus_type;
/* Do NOT directly access these two variables, unless you are arch-specific PCI
* code, or PCI core code. */
--
2.41.0
