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/cxl/core/port.c | 2 +- drivers/cxl/cxl.h | 5 +---- 2 files changed, 2 insertions(+), 5 deletions(-) (limited to 'drivers/cxl') diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 887ed6e358fb..cb730050d3d4 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -2082,7 +2082,7 @@ static int cxl_bus_uevent(const struct device *dev, struct kobj_uevent_env *env) cxl_device_id(dev)); } -static int cxl_bus_match(struct device *dev, struct device_driver *drv) +static int cxl_bus_match(struct device *dev, const struct device_driver *drv) { return cxl_device_id(dev) == to_cxl_drv(drv)->id; } diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 603c0120cff8..65c91e133e26 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -823,10 +823,7 @@ struct cxl_driver { int id; }; -static inline struct cxl_driver *to_cxl_drv(struct device_driver *drv) -{ - return container_of(drv, struct cxl_driver, drv); -} +#define to_cxl_drv(__drv) container_of_const(__drv, struct cxl_driver, drv) int __cxl_driver_register(struct cxl_driver *cxl_drv, struct module *owner, const char *modname); -- cgit v1.2.3