Merge tag 'driver-core-6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updatesk from Greg KH:
 "Here is the big set of driver core updates for 6.15-rc1. Lots of stuff
  happened this development cycle, including:

   - kernfs scaling changes to make it even faster thanks to rcu

   - bin_attribute constify work in many subsystems

   - faux bus minor tweaks for the rust bindings

   - rust binding updates for driver core, pci, and platform busses,
     making more functionaliy available to rust drivers. These are all
     due to people actually trying to use the bindings that were in
     6.14.

   - make Rafael and Danilo full co-maintainers of the driver core
     codebase

   - other minor fixes and updates"

* tag 'driver-core-6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (52 commits)
  rust: platform: require Send for Driver trait implementers
  rust: pci: require Send for Driver trait implementers
  rust: platform: impl Send + Sync for platform::Device
  rust: pci: impl Send + Sync for pci::Device
  rust: platform: fix unrestricted &mut platform::Device
  rust: pci: fix unrestricted &mut pci::Device
  rust: device: implement device context marker
  rust: pci: use to_result() in enable_device_mem()
  MAINTAINERS: driver core: mark Rafael and Danilo as co-maintainers
  rust/kernel/faux: mark Registration methods inline
  driver core: faux: only create the device if probe() succeeds
  rust/faux: Add missing parent argument to Registration::new()
  rust/faux: Drop #[repr(transparent)] from faux::Registration
  rust: io: fix devres test with new io accessor functions
  rust: io: rename `io::Io` accessors
  kernfs: Move dput() outside of the RCU section.
  efi: rci2: mark bin_attribute as __ro_after_init
  rapidio: constify 'struct bin_attribute'
  firmware: qemu_fw_cfg: constify 'struct bin_attribute'
  powerpc/perf/hv-24x7: Constify 'struct bin_attribute'
  ...

1 files changed, 26 insertions, 0 deletions

diff --git a/rust/kernel/device.rs b/rust/kernel/device.rs
index db2d9658ba47..21b343a1dc4d 100644
--- a/rust/kernel/device.rs
+++ b/rust/kernel/device.rs
@@ -209,6 +209,32 @@ unsafe impl Send for Device {}
 // synchronization in `struct device`.
 unsafe impl Sync for Device {}
 
+/// Marker trait for the context of a bus specific device.
+///
+/// Some functions of a bus specific device should only be called from a certain context, i.e. bus
+/// callbacks, such as `probe()`.
+///
+/// This is the marker trait for structures representing the context of a bus specific device.
+pub trait DeviceContext: private::Sealed {}
+
+/// The [`Normal`] context is the context of a bus specific device when it is not an argument of
+/// any bus callback.
+pub struct Normal;
+
+/// The [`Core`] context is the context of a bus specific device when it is supplied as argument of
+/// any of the bus callbacks, such as `probe()`.
+pub struct Core;
+
+mod private {
+    pub trait Sealed {}
+
+    impl Sealed for super::Core {}
+    impl Sealed for super::Normal {}
+}
+
+impl DeviceContext for Core {}
+impl DeviceContext for Normal {}
+
 #[doc(hidden)]
 #[macro_export]
 macro_rules! dev_printk {