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>

1 files changed, 1 insertions, 4 deletions

diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h
index e119f11948ef..0a8a44ac2f02 100644
--- a/include/linux/i3c/device.h
+++ b/include/linux/i3c/device.h
@@ -183,10 +183,7 @@ struct i3c_driver {
 	const struct i3c_device_id *id_table;
 };
 
-static inline struct i3c_driver *drv_to_i3cdrv(struct device_driver *drv)
-{
-	return container_of(drv, struct i3c_driver, driver);
-}
+#define drv_to_i3cdrv(__drv)	container_of_const(__drv, struct i3c_driver, driver)
 
 struct device *i3cdev_to_dev(struct i3c_device *i3cdev);