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 <[email protected]>
Reviewed-by: Alex Elder <[email protected]>
Acked-by: Sumit Garg <[email protected]>
Link: https://lore.kernel.org/r/2024070136-wrongdoer-busily-01e8@gregkh
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: gregkh

drivers/media/pci/bt8xx/bttv-gpio.c

@@ -28,9 +28,9 @@
 /* ----------------------------------------------------------------------- */
 /* internal: the bttv "bus"                                                */
 
-static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv)
+static int bttv_sub_bus_match(struct device *dev, const struct device_driver *drv)
 {
-	struct bttv_sub_driver *sub = to_bttv_sub_drv(drv);
+	const struct bttv_sub_driver *sub = to_bttv_sub_drv(drv);
 	int len = strlen(sub->wanted);
 
 	if (0 == strncmp(dev_name(dev), sub->wanted, len))