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, 1 deletions

diff --git a/arch/s390/include/asm/ccwdev.h b/arch/s390/include/asm/ccwdev.h
index 436365ff6c19..e3afcece375e 100644
--- a/arch/s390/include/asm/ccwdev.h
+++ b/arch/s390/include/asm/ccwdev.h
@@ -210,7 +210,7 @@ extern void ccw_device_get_id(struct ccw_device *, struct ccw_dev_id *);
 #define get_ccwdev_lock(x) (x)->ccwlock
 
 #define to_ccwdev(n) container_of(n, struct ccw_device, dev)
-#define to_ccwdrv(n) container_of(n, struct ccw_driver, driver)
+#define to_ccwdrv(n) container_of_const(n, struct ccw_driver, driver)
 
 extern struct ccw_device *ccw_device_create_console(struct ccw_driver *);
 extern void ccw_device_destroy_console(struct ccw_device *);