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, 2 insertions, 2 deletions

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 781f84901256..53b68f8c32f3 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -1354,10 +1354,10 @@ int sch_is_pseudo_sch(struct subchannel *sch)
 	return sch == to_css(sch->dev.parent)->pseudo_subchannel;
 }
 
-static int css_bus_match(struct device *dev, struct device_driver *drv)
+static int css_bus_match(struct device *dev, const struct device_driver *drv)
 {
 	struct subchannel *sch = to_subchannel(dev);
-	struct css_driver *driver = to_cssdriver(drv);
+	const struct css_driver *driver = to_cssdriver(drv);
 	struct css_device_id *id;
 
 	/* When driver_override is set, only bind to the matching driver */