diff options
| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-01 14:07:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-03 15:16:54 +0200 |
| commit | d69d804845985c29ab5be5a4b3b1f4787893daf8 (patch) | |
| tree | da2a783fd130da553c526692669eb847972b86d4 /drivers/firewire | |
| parent | 6b521fc111a2ad5ead39776960d3d2d289ce0722 (diff) | |
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>
Diffstat (limited to 'drivers/firewire')
| -rw-r--r-- | drivers/firewire/core-device.c | 6 |
1 files changed, 3 insertions, 3 deletions
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; |