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 --- arch/arm/common/locomo.c | 4 ++-- arch/arm/include/asm/hardware/locomo.h | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/common/locomo.c b/arch/arm/common/locomo.c index 6d0c9f7268ba..06b0e5fd54a6 100644 --- a/arch/arm/common/locomo.c +++ b/arch/arm/common/locomo.c @@ -816,10 +816,10 @@ EXPORT_SYMBOL(locomo_frontlight_set); * We model this as a regular bus type, and hang devices directly * off this. */ -static int locomo_match(struct device *_dev, struct device_driver *_drv) +static int locomo_match(struct device *_dev, const struct device_driver *_drv) { struct locomo_dev *dev = LOCOMO_DEV(_dev); - struct locomo_driver *drv = LOCOMO_DRV(_drv); + const struct locomo_driver *drv = LOCOMO_DRV(_drv); return dev->devid == drv->devid; } diff --git a/arch/arm/include/asm/hardware/locomo.h b/arch/arm/include/asm/hardware/locomo.h index 9fd9ad5d9202..3190e1e5067a 100644 --- a/arch/arm/include/asm/hardware/locomo.h +++ b/arch/arm/include/asm/hardware/locomo.h @@ -189,7 +189,7 @@ struct locomo_driver { void (*remove)(struct locomo_dev *); }; -#define LOCOMO_DRV(_d) container_of((_d), struct locomo_driver, drv) +#define LOCOMO_DRV(_d) container_of_const((_d), struct locomo_driver, drv) #define LOCOMO_DRIVER_NAME(_ldev) ((_ldev)->dev.driver->name) -- cgit v1.2.3 From b57d5ffc3ab507d0e19fc8b90b19c76af43fb790 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Fri, 12 Jul 2024 11:39:17 +0200 Subject: ARM: sa1100: make match function take a const pointer In commit d69d80484598 ("driver core: have match() callback in struct bus_type take a const *"), the match callback for busses was changed to take a const pointer to struct device_driver. Unfortunately I missed fixing up the sa1111 code, and was only noticed after-the-fact by the kernel test robot. Resolve this issue by properly changing the sa111_match() function. Cc: Russell King Fixes: d69d80484598 ("driver core: have match() callback in struct bus_type take a const *") Reported-by: kernel test robot Link: https://lore.kernel.org/r/20240712093916.2121096-2-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman --- arch/arm/common/sa1111.c | 4 ++-- arch/arm/include/asm/hardware/sa1111.h | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) (limited to 'arch/arm') diff --git a/arch/arm/common/sa1111.c b/arch/arm/common/sa1111.c index 1fbd7363cf11..550978dc3c50 100644 --- a/arch/arm/common/sa1111.c +++ b/arch/arm/common/sa1111.c @@ -1339,10 +1339,10 @@ EXPORT_SYMBOL_GPL(sa1111_get_irq); * We model this as a regular bus type, and hang devices directly * off this. */ -static int sa1111_match(struct device *_dev, struct device_driver *_drv) +static int sa1111_match(struct device *_dev, const struct device_driver *_drv) { struct sa1111_dev *dev = to_sa1111_device(_dev); - struct sa1111_driver *drv = SA1111_DRV(_drv); + const struct sa1111_driver *drv = SA1111_DRV(_drv); return !!(dev->devid & drv->devid); } diff --git a/arch/arm/include/asm/hardware/sa1111.h b/arch/arm/include/asm/hardware/sa1111.h index d8c6f8a99dfa..a815f39b4243 100644 --- a/arch/arm/include/asm/hardware/sa1111.h +++ b/arch/arm/include/asm/hardware/sa1111.h @@ -404,7 +404,7 @@ struct sa1111_driver { void (*remove)(struct sa1111_dev *); }; -#define SA1111_DRV(_d) container_of((_d), struct sa1111_driver, drv) +#define SA1111_DRV(_d) container_of_const((_d), struct sa1111_driver, drv) #define SA1111_DRIVER_NAME(_sadev) ((_sadev)->dev.driver->name) -- cgit v1.2.3