Refactor the `acpi_id_info` and `of_id_info` methods in the `Adapter` trait
to reduce duplication. Previously, each method had two versions selected
via `#[cfg(...)]` and `#[cfg(not(...))]`. This change merges them into a
single method per case by using `#[cfg]` blocks within the method bodies.
Suggested-by: Benno Lossin <lossin@kernel.org>
Signed-off-by: Igor Korotin <igor.korotin.linux@gmail.com>
---
rust/kernel/driver.rs | 76 +++++++++++++++++++++----------------------
1 file changed, 38 insertions(+), 38 deletions(-)
diff --git a/rust/kernel/driver.rs b/rust/kernel/driver.rs
index 638f1d270af8..805f61bd4a50 100644
--- a/rust/kernel/driver.rs
+++ b/rust/kernel/driver.rs
@@ -147,30 +147,30 @@ pub trait Adapter {
/// Returns the driver's private data from the matching entry in the [`acpi::IdTable`], if any.
///
/// If this returns `None`, it means there is no match with an entry in the [`acpi::IdTable`].
- #[cfg(CONFIG_ACPI)]
fn acpi_id_info(dev: &device::Device) -> Option<&'static Self::IdInfo> {
- let table = Self::acpi_id_table()?;
+ #[cfg(not(CONFIG_ACPI))] {
+ let _ = dev;
+ return None;
+ }
- // SAFETY:
- // - `table` has static lifetime, hence it's valid for read,
- // - `dev` is guaranteed to be valid while it's alive, and so is `pdev.as_ref().as_raw()`.
- let raw_id = unsafe { bindings::acpi_match_device(table.as_ptr(), dev.as_raw()) };
+ #[cfg(CONFIG_ACPI)] {
+ let table = Self::acpi_id_table()?;
- if raw_id.is_null() {
- None
- } else {
- // SAFETY: `DeviceId` is a `#[repr(transparent)` wrapper of `struct of_device_id` and
- // does not add additional invariants, so it's safe to transmute.
- let id = unsafe { &*raw_id.cast::<acpi::DeviceId>() };
+ // SAFETY:
+ // - `table` has static lifetime, hence it's valid for read,
+ // - `dev` is guaranteed to be valid while it's alive, and so is `pdev.as_ref().as_raw()`.
+ let raw_id = unsafe { bindings::acpi_match_device(table.as_ptr(), dev.as_raw()) };
- Some(table.info(<acpi::DeviceId as crate::device_id::RawDeviceId>::index(id)))
- }
- }
+ if raw_id.is_null() {
+ None
+ } else {
+ // SAFETY: `DeviceId` is a `#[repr(transparent)` wrapper of `struct of_device_id` and
+ // does not add additional invariants, so it's safe to transmute.
+ let id = unsafe { &*raw_id.cast::<acpi::DeviceId>() };
- #[cfg(not(CONFIG_ACPI))]
- #[allow(missing_docs)]
- fn acpi_id_info(_dev: &device::Device) -> Option<&'static Self::IdInfo> {
- None
+ Some(table.info(<acpi::DeviceId as crate::device_id::RawDeviceId>::index(id)))
+ }
+ }
}
/// The [`of::IdTable`] of the corresponding driver.
@@ -179,30 +179,30 @@ fn acpi_id_info(_dev: &device::Device) -> Option<&'static Self::IdInfo> {
/// Returns the driver's private data from the matching entry in the [`of::IdTable`], if any.
///
/// If this returns `None`, it means there is no match with an entry in the [`of::IdTable`].
- #[cfg(CONFIG_OF)]
fn of_id_info(dev: &device::Device) -> Option<&'static Self::IdInfo> {
- let table = Self::of_id_table()?;
+ #[cfg(not(CONFIG_OF))] {
+ let _ = dev;
+ return None;
+ }
- // SAFETY:
- // - `table` has static lifetime, hence it's valid for read,
- // - `dev` is guaranteed to be valid while it's alive, and so is `pdev.as_ref().as_raw()`.
- let raw_id = unsafe { bindings::of_match_device(table.as_ptr(), dev.as_raw()) };
+ #[cfg(CONFIG_OF)] {
+ let table = Self::of_id_table()?;
- if raw_id.is_null() {
- None
- } else {
- // SAFETY: `DeviceId` is a `#[repr(transparent)` wrapper of `struct of_device_id` and
- // does not add additional invariants, so it's safe to transmute.
- let id = unsafe { &*raw_id.cast::<of::DeviceId>() };
+ // SAFETY:
+ // - `table` has static lifetime, hence it's valid for read,
+ // - `dev` is guaranteed to be valid while it's alive, and so is `pdev.as_ref().as_raw()`.
+ let raw_id = unsafe { bindings::of_match_device(table.as_ptr(), dev.as_raw()) };
- Some(table.info(<of::DeviceId as crate::device_id::RawDeviceId>::index(id)))
- }
- }
+ if raw_id.is_null() {
+ None
+ } else {
+ // SAFETY: `DeviceId` is a `#[repr(transparent)` wrapper of `struct of_device_id` and
+ // does not add additional invariants, so it's safe to transmute.
+ let id = unsafe { &*raw_id.cast::<of::DeviceId>() };
- #[cfg(not(CONFIG_OF))]
- #[allow(missing_docs)]
- fn of_id_info(_dev: &device::Device) -> Option<&'static Self::IdInfo> {
- None
+ Some(table.info(<of::DeviceId as crate::device_id::RawDeviceId>::index(id)))
+ }
+ }
}
/// Returns the driver's private data from the matching entry of any of the ID tables, if any.
--
2.43.0On Tue, Jun 10, 2025 at 04:05:38PM +0100, Igor Korotin wrote:
> Refactor the `acpi_id_info` and `of_id_info` methods in the `Adapter` trait
> to reduce duplication. Previously, each method had two versions selected
> via `#[cfg(...)]` and `#[cfg(not(...))]`. This change merges them into a
> single method per case by using `#[cfg]` blocks within the method bodies.
>
> Suggested-by: Benno Lossin <lossin@kernel.org>
> Signed-off-by: Igor Korotin <igor.korotin.linux@gmail.com>
> ---
> rust/kernel/driver.rs | 76 +++++++++++++++++++++----------------------
> 1 file changed, 38 insertions(+), 38 deletions(-)
>
> diff --git a/rust/kernel/driver.rs b/rust/kernel/driver.rs
> index 638f1d270af8..805f61bd4a50 100644
> --- a/rust/kernel/driver.rs
> +++ b/rust/kernel/driver.rs
> @@ -147,30 +147,30 @@ pub trait Adapter {
> /// Returns the driver's private data from the matching entry in the [`acpi::IdTable`], if any.
> ///
> /// If this returns `None`, it means there is no match with an entry in the [`acpi::IdTable`].
> - #[cfg(CONFIG_ACPI)]
> fn acpi_id_info(dev: &device::Device) -> Option<&'static Self::IdInfo> {
> - let table = Self::acpi_id_table()?;
> + #[cfg(not(CONFIG_ACPI))] {
> + let _ = dev;
> + return None;
> + }
>
> - // SAFETY:
> - // - `table` has static lifetime, hence it's valid for read,
> - // - `dev` is guaranteed to be valid while it's alive, and so is `pdev.as_ref().as_raw()`.
> - let raw_id = unsafe { bindings::acpi_match_device(table.as_ptr(), dev.as_raw()) };
> + #[cfg(CONFIG_ACPI)] {
> + let table = Self::acpi_id_table()?;
>
> - if raw_id.is_null() {
> - None
> - } else {
> - // SAFETY: `DeviceId` is a `#[repr(transparent)` wrapper of `struct of_device_id` and
> - // does not add additional invariants, so it's safe to transmute.
> - let id = unsafe { &*raw_id.cast::<acpi::DeviceId>() };
> + // SAFETY:
> + // - `table` has static lifetime, hence it's valid for read,
> + // - `dev` is guaranteed to be valid while it's alive, and so is `pdev.as_ref().as_raw()`.
> + let raw_id = unsafe { bindings::acpi_match_device(table.as_ptr(), dev.as_raw()) };
>
> - Some(table.info(<acpi::DeviceId as crate::device_id::RawDeviceId>::index(id)))
> - }
> - }
> + if raw_id.is_null() {
> + None
> + } else {
> + // SAFETY: `DeviceId` is a `#[repr(transparent)` wrapper of `struct of_device_id` and
> + // does not add additional invariants, so it's safe to transmute.
> + let id = unsafe { &*raw_id.cast::<acpi::DeviceId>() };
>
> - #[cfg(not(CONFIG_ACPI))]
> - #[allow(missing_docs)]
> - fn acpi_id_info(_dev: &device::Device) -> Option<&'static Self::IdInfo> {
> - None
> + Some(table.info(<acpi::DeviceId as crate::device_id::RawDeviceId>::index(id)))
> + }
> + }
> }
It seems there has been a misunderstanding, the idea was to refactor
Adapter::of_id_info() in one patch and introduce Adapter::acpi_id_info() in a
subsequent patch already being the suggested implementation by Benno.
We try to avoid introducing code, just to change it again in a subsequent patch.
On Tue, Jun 10, 2025 at 4:15 PM Danilo Krummrich <dakr@kernel.org> wrote:
>
> On Tue, Jun 10, 2025 at 04:05:38PM +0100, Igor Korotin wrote:
> > Refactor the `acpi_id_info` and `of_id_info` methods in the `Adapter` trait
> > to reduce duplication. Previously, each method had two versions selected
> > via `#[cfg(...)]` and `#[cfg(not(...))]`. This change merges them into a
> > single method per case by using `#[cfg]` blocks within the method bodies.
> >
> > Suggested-by: Benno Lossin <lossin@kernel.org>
> > Signed-off-by: Igor Korotin <igor.korotin.linux@gmail.com>
> > ---
> > rust/kernel/driver.rs | 76 +++++++++++++++++++++----------------------
> > 1 file changed, 38 insertions(+), 38 deletions(-)
> >
> > diff --git a/rust/kernel/driver.rs b/rust/kernel/driver.rs
> > index 638f1d270af8..805f61bd4a50 100644
> > --- a/rust/kernel/driver.rs
> > +++ b/rust/kernel/driver.rs
> > @@ -147,30 +147,30 @@ pub trait Adapter {
> > /// Returns the driver's private data from the matching entry in the [`acpi::IdTable`], if any.
> > ///
> > /// If this returns `None`, it means there is no match with an entry in the [`acpi::IdTable`].
> > - #[cfg(CONFIG_ACPI)]
> > fn acpi_id_info(dev: &device::Device) -> Option<&'static Self::IdInfo> {
> > - let table = Self::acpi_id_table()?;
> > + #[cfg(not(CONFIG_ACPI))] {
> > + let _ = dev;
> > + return None;
> > + }
> >
> > - // SAFETY:
> > - // - `table` has static lifetime, hence it's valid for read,
> > - // - `dev` is guaranteed to be valid while it's alive, and so is `pdev.as_ref().as_raw()`.
> > - let raw_id = unsafe { bindings::acpi_match_device(table.as_ptr(), dev.as_raw()) };
> > + #[cfg(CONFIG_ACPI)] {
> > + let table = Self::acpi_id_table()?;
> >
> > - if raw_id.is_null() {
> > - None
> > - } else {
> > - // SAFETY: `DeviceId` is a `#[repr(transparent)` wrapper of `struct of_device_id` and
> > - // does not add additional invariants, so it's safe to transmute.
> > - let id = unsafe { &*raw_id.cast::<acpi::DeviceId>() };
> > + // SAFETY:
> > + // - `table` has static lifetime, hence it's valid for read,
> > + // - `dev` is guaranteed to be valid while it's alive, and so is `pdev.as_ref().as_raw()`.
> > + let raw_id = unsafe { bindings::acpi_match_device(table.as_ptr(), dev.as_raw()) };
> >
> > - Some(table.info(<acpi::DeviceId as crate::device_id::RawDeviceId>::index(id)))
> > - }
> > - }
> > + if raw_id.is_null() {
> > + None
> > + } else {
> > + // SAFETY: `DeviceId` is a `#[repr(transparent)` wrapper of `struct of_device_id` and
> > + // does not add additional invariants, so it's safe to transmute.
> > + let id = unsafe { &*raw_id.cast::<acpi::DeviceId>() };
> >
> > - #[cfg(not(CONFIG_ACPI))]
> > - #[allow(missing_docs)]
> > - fn acpi_id_info(_dev: &device::Device) -> Option<&'static Self::IdInfo> {
> > - None
> > + Some(table.info(<acpi::DeviceId as crate::device_id::RawDeviceId>::index(id)))
> > + }
> > + }
> > }
>
> It seems there has been a misunderstanding, the idea was to refactor
> Adapter::of_id_info() in one patch and introduce Adapter::acpi_id_info() in a
> subsequent patch already being the suggested implementation by Benno.
>
> We try to avoid introducing code, just to change it again in a subsequent patch.
That does make perfect sense. My bad. I'll reorder changes in the v5.
Sorry for the mess. Thanks for the review.
Best Regards
Igor
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