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/media | |
| 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/media')
| -rw-r--r-- | drivers/media/pci/bt8xx/bttv-gpio.c | 4 | ||||
| -rw-r--r-- | drivers/media/pci/bt8xx/bttv.h | 2 |
2 files changed, 3 insertions, 3 deletions
diff --git a/drivers/media/pci/bt8xx/bttv-gpio.c b/drivers/media/pci/bt8xx/bttv-gpio.c index 6b7fea50328c..59a6f160aac7 100644 --- a/drivers/media/pci/bt8xx/bttv-gpio.c +++ b/drivers/media/pci/bt8xx/bttv-gpio.c @@ -28,9 +28,9 @@ /* ----------------------------------------------------------------------- */ /* internal: the bttv "bus" */ -static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv) +static int bttv_sub_bus_match(struct device *dev, const struct device_driver *drv) { - struct bttv_sub_driver *sub = to_bttv_sub_drv(drv); + const struct bttv_sub_driver *sub = to_bttv_sub_drv(drv); int len = strlen(sub->wanted); if (0 == strncmp(dev_name(dev), sub->wanted, len)) diff --git a/drivers/media/pci/bt8xx/bttv.h b/drivers/media/pci/bt8xx/bttv.h index eed7eeb3b963..97bbed980f98 100644 --- a/drivers/media/pci/bt8xx/bttv.h +++ b/drivers/media/pci/bt8xx/bttv.h @@ -341,7 +341,7 @@ struct bttv_sub_driver { int (*probe)(struct bttv_sub_device *sub); void (*remove)(struct bttv_sub_device *sub); }; -#define to_bttv_sub_drv(x) container_of((x), struct bttv_sub_driver, drv) +#define to_bttv_sub_drv(x) container_of_const((x), struct bttv_sub_driver, drv) int bttv_sub_register(struct bttv_sub_driver *drv, char *wanted); int bttv_sub_unregister(struct bttv_sub_driver *drv); |