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/gpu | |
| 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/gpu')
| -rw-r--r-- | drivers/gpu/drm/display/drm_dp_aux_bus.c | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_mipi_dsi.c | 2 | ||||
| -rw-r--r-- | drivers/gpu/host1x/bus.c | 2 |
3 files changed, 3 insertions, 3 deletions
diff --git a/drivers/gpu/drm/display/drm_dp_aux_bus.c b/drivers/gpu/drm/display/drm_dp_aux_bus.c index 5afc26be9d2a..d810529ebfb6 100644 --- a/drivers/gpu/drm/display/drm_dp_aux_bus.c +++ b/drivers/gpu/drm/display/drm_dp_aux_bus.c @@ -36,7 +36,7 @@ struct dp_aux_ep_device_with_data { * * Return: True if this driver matches this device; false otherwise. */ -static int dp_aux_ep_match(struct device *dev, struct device_driver *drv) +static int dp_aux_ep_match(struct device *dev, const struct device_driver *drv) { return !!of_match_device(drv->of_match_table, dev); } diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c index 795001bb7ff1..ddd51279cc9a 100644 --- a/drivers/gpu/drm/drm_mipi_dsi.c +++ b/drivers/gpu/drm/drm_mipi_dsi.c @@ -48,7 +48,7 @@ * subset of the MIPI DCS command set. */ -static int mipi_dsi_device_match(struct device *dev, struct device_driver *drv) +static int mipi_dsi_device_match(struct device *dev, const struct device_driver *drv) { struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); diff --git a/drivers/gpu/host1x/bus.c b/drivers/gpu/host1x/bus.c index 7c52757a89db..8e09d6d328d2 100644 --- a/drivers/gpu/host1x/bus.c +++ b/drivers/gpu/host1x/bus.c @@ -333,7 +333,7 @@ static int host1x_del_client(struct host1x *host1x, return -ENODEV; } -static int host1x_device_match(struct device *dev, struct device_driver *drv) +static int host1x_device_match(struct device *dev, const struct device_driver *drv) { return strcmp(dev_name(dev), drv->name) == 0; } |