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 --- include/sound/ac97/codec.h | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) (limited to 'include/sound') diff --git a/include/sound/ac97/codec.h b/include/sound/ac97/codec.h index 2fc641cb1982..882b849b9255 100644 --- a/include/sound/ac97/codec.h +++ b/include/sound/ac97/codec.h @@ -73,10 +73,7 @@ static inline struct ac97_codec_device *to_ac97_device(struct device *d) return container_of(d, struct ac97_codec_device, dev); } -static inline struct ac97_codec_driver *to_ac97_driver(struct device_driver *d) -{ - return container_of(d, struct ac97_codec_driver, driver); -} +#define to_ac97_driver(__drv) container_of_const(__drv, struct ac97_codec_driver, driver) #if IS_ENABLED(CONFIG_AC97_BUS_NEW) int snd_ac97_codec_driver_register(struct ac97_codec_driver *drv); -- cgit v1.3.1