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PCI: Make pci_bus_type constant

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Since commit d492cc2573 ("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.

Link: https://lore.kernel.org/r/20240823074202.139265-1-kunwu.chan@linux.dev
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kunwu Chan 2024-08-23 15:42:01 +08:00 committed by Bjorn Helgaas
parent dbc3171194
commit 8a48281cfa
2 changed files with 2 additions and 2 deletions
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2
drivers/pci/pci-driver.c
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@ -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,

2
include/linux/pci.h
View File

@ -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. */