diff options
| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-01 15:07:37 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-03 16:16:54 +0300 |
| commit | d69d804845985c29ab5be5a4b3b1f4787893daf8 (patch) | |
| tree | da2a783fd130da553c526692669eb847972b86d4 /include/sound/ac97 | |
| parent | 6b521fc111a2ad5ead39776960d3d2d289ce0722 (diff) | |
| download | linux-d69d804845985c29ab5be5a4b3b1f4787893daf8.tar.xz | |
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 <rafael@kernel.org>
Reviewed-by: Alex Elder <elder@kernel.org>
Acked-by: Sumit Garg <sumit.garg@linaro.org>
Link: https://lore.kernel.org/r/2024070136-wrongdoer-busily-01e8@gregkh
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/sound/ac97')
| -rw-r--r-- | include/sound/ac97/codec.h | 5 |
1 files changed, 1 insertions, 4 deletions
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); |