From d69d804845985c29ab5be5a4b3b1f4787893daf8 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Mon, 1 Jul 2024 14:07:37 +0200 Subject: driver core: have match() callback in struct bus_type take a const * In the match() callback, the struct device_driver * should not be changed, so change the function callback to be a const *. This is one step of many towards making the driver core safe to have struct device_driver in read-only memory. Because the match() callback is in all busses, all busses are modified to handle this properly. This does entail switching some container_of() calls to container_of_const() to properly handle the constant *. For some busses, like PCI and USB and HV, the const * is cast away in the match callback as those busses do want to modify those structures at this point in time (they have a local lock in the driver structure.) That will have to be changed in the future if they wish to have their struct device * in read-only-memory. Cc: Rafael J. Wysocki Reviewed-by: Alex Elder Acked-by: Sumit Garg Link: https://lore.kernel.org/r/2024070136-wrongdoer-busily-01e8@gregkh Signed-off-by: Greg Kroah-Hartman --- drivers/pci/endpoint/pci-epf-core.c | 4 ++-- drivers/pci/pci-driver.c | 8 ++++---- 2 files changed, 6 insertions(+), 6 deletions(-) (limited to 'drivers/pci') diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c index 323f2a60ab16..8fa2797d4169 100644 --- a/drivers/pci/endpoint/pci-epf-core.c +++ b/drivers/pci/endpoint/pci-epf-core.c @@ -488,10 +488,10 @@ pci_epf_match_id(const struct pci_epf_device_id *id, const struct pci_epf *epf) return NULL; } -static int pci_epf_device_match(struct device *dev, struct device_driver *drv) +static int pci_epf_device_match(struct device *dev, const struct device_driver *drv) { struct pci_epf *epf = to_pci_epf(dev); - struct pci_epf_driver *driver = to_pci_epf_driver(drv); + const struct pci_epf_driver *driver = to_pci_epf_driver(drv); if (driver->id_table) return !!pci_epf_match_id(driver->id_table, epf); diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index af2996d0d17f..f412ef73a6e4 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -1503,7 +1503,7 @@ EXPORT_SYMBOL(pci_dev_driver); * system is in its list of supported devices. Returns the matching * pci_device_id structure or %NULL if there is no match. */ -static int pci_bus_match(struct device *dev, struct device_driver *drv) +static int pci_bus_match(struct device *dev, const struct device_driver *drv) { struct pci_dev *pci_dev = to_pci_dev(dev); struct pci_driver *pci_drv; @@ -1512,7 +1512,7 @@ static int pci_bus_match(struct device *dev, struct device_driver *drv) if (!pci_dev->match_driver) return 0; - pci_drv = to_pci_driver(drv); + pci_drv = (struct pci_driver *)to_pci_driver(drv); found_id = pci_match_device(pci_drv, pci_dev); if (found_id) return 1; @@ -1688,10 +1688,10 @@ struct bus_type pci_bus_type = { EXPORT_SYMBOL(pci_bus_type); #ifdef CONFIG_PCIEPORTBUS -static int pcie_port_bus_match(struct device *dev, struct device_driver *drv) +static int pcie_port_bus_match(struct device *dev, const struct device_driver *drv) { struct pcie_device *pciedev; - struct pcie_port_service_driver *driver; + const struct pcie_port_service_driver *driver; if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type) return 0; -- cgit