From d69d804845985c29ab5be5a4b3b1f4787893daf8 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Mon, 1 Jul 2024 14:07:37 +0200 Subject: 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 Reviewed-by: Alex Elder Acked-by: Sumit Garg Link: https://lore.kernel.org/r/2024070136-wrongdoer-busily-01e8@gregkh Signed-off-by: Greg Kroah-Hartman --- drivers/firewire/core-device.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/firewire') diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c index e6cdb905eeac..00e9a13e6c45 100644 --- a/drivers/firewire/core-device.c +++ b/drivers/firewire/core-device.c @@ -190,10 +190,10 @@ static bool match_ids(const struct ieee1394_device_id *id_table, int *id) } static const struct ieee1394_device_id *unit_match(struct device *dev, - struct device_driver *drv) + const struct device_driver *drv) { const struct ieee1394_device_id *id_table = - container_of(drv, struct fw_driver, driver)->id_table; + container_of_const(drv, struct fw_driver, driver)->id_table; int id[] = {0, 0, 0, 0}; get_modalias_ids(fw_unit(dev), id); @@ -207,7 +207,7 @@ static const struct ieee1394_device_id *unit_match(struct device *dev, static bool is_fw_unit(const struct device *dev); -static int fw_unit_match(struct device *dev, struct device_driver *drv) +static int fw_unit_match(struct device *dev, const struct device_driver *drv) { /* We only allow binding to fw_units. */ return is_fw_unit(dev) && unit_match(dev, drv) != NULL; -- cgit v1.2.3