linux-kernel - [PATCH] PCI: Make pci_bus

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Message-ID: <20240823074202.139265-1-kunwu.chan@linux.dev>
Date: Fri, 23 Aug 2024 15:42:01 +0800
From: Kunwu Chan <kunwu.chan@...ux.dev>
To: bhelgaas@...gle.com
Cc: linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Kunwu Chan <chentao@...inos.cn>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH] PCI: Make pci_bus_type constant

From: Kunwu Chan <chentao@...inos.cn>

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@...uxfoundation.org>
Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Signed-off-by: Kunwu Chan <chentao@...inos.cn>
---
 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