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/tc | |
| 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/tc')
| -rw-r--r-- | drivers/tc/tc-driver.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/tc/tc-driver.c b/drivers/tc/tc-driver.c index 1c9d983a5a1f..2f6d147594b0 100644 --- a/drivers/tc/tc-driver.c +++ b/drivers/tc/tc-driver.c @@ -56,7 +56,7 @@ EXPORT_SYMBOL(tc_unregister_driver); * system is in its list of supported devices. Returns the matching * tc_device_id structure or %NULL if there is no match. */ -static const struct tc_device_id *tc_match_device(struct tc_driver *tdrv, +static const struct tc_device_id *tc_match_device(const struct tc_driver *tdrv, struct tc_dev *tdev) { const struct tc_device_id *id = tdrv->id_table; @@ -82,10 +82,10 @@ static const struct tc_device_id *tc_match_device(struct tc_driver *tdrv, * system is in its list of supported devices. Returns 1 if there * is a match or 0 otherwise. */ -static int tc_bus_match(struct device *dev, struct device_driver *drv) +static int tc_bus_match(struct device *dev, const struct device_driver *drv) { struct tc_dev *tdev = to_tc_dev(dev); - struct tc_driver *tdrv = to_tc_driver(drv); + const struct tc_driver *tdrv = to_tc_driver(drv); const struct tc_device_id *id; id = tc_match_device(tdrv, tdev); |