Re: [PATCH v2 4/7] rust: drm: set fops.owner from driver module pointer

On Thu May 21, 2026 at 8:52 AM BST, Alvin Sun wrote:
> Change `create_fops()` to accept an owner module pointer instead of
> hardcoding `null_mut()`, ensuring the kernel correctly tracks the
> module owning the DRM device's file operations.
>
> Signed-off-by: Alvin Sun <[email protected]>
> ---
>  rust/kernel/drm/device.rs  | 3 ++-
>  rust/kernel/drm/gem/mod.rs | 4 ++--
>  2 files changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/rust/kernel/drm/device.rs b/rust/kernel/drm/device.rs
> index 403fc35353c74..53e44a780ae97 100644
> --- a/rust/kernel/drm/device.rs
> +++ b/rust/kernel/drm/device.rs
> @@ -111,7 +111,8 @@ impl<T: drm::Driver> Device<T> {
>          fops: &Self::GEM_FOPS,
>      };
>  
> -    const GEM_FOPS: bindings::file_operations = drm::gem::create_fops();
> +    const GEM_FOPS: bindings::file_operations =
> +        drm::gem::create_fops(<T::ThisModule as crate::ModuleMetadata>::THIS_MODULE.as_ptr());

I wonder if the assoc type should just be called `Owner` or `OwnerModule`?

Best.
Gary

>  
>      /// Create a new `drm::Device` for a `drm::Driver`.
>      pub fn new(dev: &device::Device, data: impl PinInit<T::Data, Error>) -> Result<ARef<Self>> {
> diff --git a/rust/kernel/drm/gem/mod.rs b/rust/kernel/drm/gem/mod.rs
> index 01b5bd47a3332..9a203efc59116 100644
> --- a/rust/kernel/drm/gem/mod.rs
> +++ b/rust/kernel/drm/gem/mod.rs
> @@ -357,10 +357,10 @@ impl<T: DriverObject> AllocImpl for Object<T> {
>      };
>  }
>  
> -pub(super) const fn create_fops() -> bindings::file_operations {
> +pub(super) const fn create_fops(owner: *mut bindings::module) -> bindings::file_operations {
>      let mut fops: bindings::file_operations = pin_init::zeroed();
>  
> -    fops.owner = core::ptr::null_mut();
> +    fops.owner = owner;
>      fops.open = Some(bindings::drm_open);
>      fops.release = Some(bindings::drm_release);
>      fops.unlocked_ioctl = Some(bindings::drm_ioctl);