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]>

1 files changed, 1 insertions, 5 deletions

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 5e39baa7f6cb..22c22fb91042 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1330,11 +1330,7 @@ struct hv_device {
 
 
 #define device_to_hv_device(d)	container_of_const(d, struct hv_device, device)
-
-static inline struct hv_driver *drv_to_hv_drv(struct device_driver *d)
-{
-	return container_of(d, struct hv_driver, driver);
-}
+#define drv_to_hv_drv(d)	container_of_const(d, struct hv_driver, driver)
 
 static inline void hv_set_drvdata(struct hv_device *dev, void *data)
 {