diff options
| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-01 14:07:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-03 15:16:54 +0200 |
| commit | d69d804845985c29ab5be5a4b3b1f4787893daf8 (patch) | |
| tree | da2a783fd130da553c526692669eb847972b86d4 /drivers/misc | |
| parent | MAINTAINERS: add Rust device abstractions to DRIVER CORE (diff) | |
| download | linux-d69d804845985c29ab5be5a4b3b1f4787893daf8.tar.xz linux-d69d804845985c29ab5be5a4b3b1f4787893daf8.zip | |
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 'drivers/misc')
| -rw-r--r-- | drivers/misc/mei/bus.c | 4 | ||||
| -rw-r--r-- | drivers/misc/tifm_core.c | 6 |
2 files changed, 5 insertions, 5 deletions
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c index 99393f610cdf..5576146ab13b 100644 --- a/drivers/misc/mei/bus.c +++ b/drivers/misc/mei/bus.c @@ -19,7 +19,7 @@ #include "mei_dev.h" #include "client.h" -#define to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver) +#define to_mei_cl_driver(d) container_of_const(d, struct mei_cl_driver, driver) /** * __mei_cl_send - internal client send (write) @@ -1124,7 +1124,7 @@ struct mei_cl_device_id *mei_cl_device_find(const struct mei_cl_device *cldev, * * Return: 1 if matching device was found 0 otherwise */ -static int mei_cl_device_match(struct device *dev, struct device_driver *drv) +static int mei_cl_device_match(struct device *dev, const struct device_driver *drv) { const struct mei_cl_device *cldev = to_mei_cl_device(dev); const struct mei_cl_driver *cldrv = to_mei_cl_driver(drv); diff --git a/drivers/misc/tifm_core.c b/drivers/misc/tifm_core.c index fd9c3cbbc51e..12355d34e193 100644 --- a/drivers/misc/tifm_core.c +++ b/drivers/misc/tifm_core.c @@ -38,11 +38,11 @@ static int tifm_dev_match(struct tifm_dev *sock, struct tifm_device_id *id) return 0; } -static int tifm_bus_match(struct device *dev, struct device_driver *drv) +static int tifm_bus_match(struct device *dev, const struct device_driver *drv) { struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev); - struct tifm_driver *fm_drv = container_of(drv, struct tifm_driver, - driver); + const struct tifm_driver *fm_drv = container_of_const(drv, struct tifm_driver, + driver); struct tifm_device_id *ids = fm_drv->id_table; if (ids) { |