Hi,
On 11/23/22 13:25, Greg Kroah-Hartman wrote:
The uevent() callback in struct device_type should not be modifying the
device that is passed into it, so mark it as a const * and propagate the
function signature changes out into all relevant subsystems that use
this callback.
[...]
diff --git a/drivers/platform/surface/aggregator/bus.c b/drivers/platform/surface/aggregator/bus.c
index de539938896e..407eb55050a6 100644
--- a/drivers/platform/surface/aggregator/bus.c
+++ b/drivers/platform/surface/aggregator/bus.c
@@ -35,9 +35,9 @@ static struct attribute *ssam_device_attrs[] = {
};
ATTRIBUTE_GROUPS(ssam_device);
-static int ssam_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int ssam_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
{
- struct ssam_device *sdev = to_ssam_device(dev);
+ const struct ssam_device *sdev = to_ssam_device(dev);
return add_uevent_var(env, "MODALIAS=ssam:d%02Xc%02Xt%02Xi%02Xf%02X",
sdev->uid.domain, sdev->uid.category,
[...]
--- a/include/linux/surface_aggregator/device.h
+++ b/include/linux/surface_aggregator/device.h
@@ -229,7 +229,7 @@ static inline bool is_ssam_device(struct device *d)
* Return: Returns a pointer to the &struct ssam_device wrapping the given
* device @d.
*/
-static inline struct ssam_device *to_ssam_device(struct device *d)
+static inline struct ssam_device *to_ssam_device(const struct device *d)
{
return container_of(d, struct ssam_device, dev);
}
I am slightly conflicted about this change as that now more or less
implicitly drops the const. So I'm wondering if it wouldn't be better to
either create a function specifically for const pointers or to just
open-code it in the instance above.
I guess we could also convert this to a macro. Then at least there
wouldn't be an explicit and potentially misleading const-conversion
indicated in the function signature.
Regards,
Max
