Commit 8a48281c authored by Kunwu Chan's avatar Kunwu Chan Committed by Bjorn Helgaas
Browse files

PCI: Make pci_bus_type constant 

Since commit d492cc25 ("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: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarKunwu Chan <chentao@kylinos.cn>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
parent dbc31711

drivers/pci/pci-driver.c

+1 −1
Original line number Diff line number Diff line
@@ -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,

include/linux/pci.h

+1 −1
Original line number Diff line number Diff line
@@ -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. */