[PATCH] rust: simplify `Adapter::id_info`

[PATCH] rust: simplify `Adapter::id_info`

[Onur Özkan]

It was obviously unnecessary to check if `id` is `Some`.

Signed-off-by: Onur Özkan <work@onurozkan.dev>
---
 rust/kernel/driver.rs | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/rust/kernel/driver.rs b/rust/kernel/driver.rs
index ec9166cedfa7..1036755cb27d 100644
--- a/rust/kernel/driver.rs
+++ b/rust/kernel/driver.rs
@@ -178,11 +178,6 @@ fn of_id_info(_dev: &device::Device) -> Option<&'static Self::IdInfo> {
     /// If this returns `None`, it means that there is no match in any of the ID tables directly
     /// associated with a [`device::Device`].
     fn id_info(dev: &device::Device) -> Option<&'static Self::IdInfo> {
-        let id = Self::of_id_info(dev);
-        if id.is_some() {
-            return id;
-        }
-
-        None
+        Self::of_id_info(dev)
     }
 }
--
2.50.0

Re: [PATCH] rust: simplify `Adapter::id_info`

[Danilo Krummrich]

On Wed, Jun 25, 2025 at 07:36:30AM +0300, Onur Özkan wrote:
> It was obviously unnecessary to check if `id` is `Some`.
> 
> Signed-off-by: Onur Özkan <work@onurozkan.dev>
> ---
>  rust/kernel/driver.rs | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/rust/kernel/driver.rs b/rust/kernel/driver.rs
> index ec9166cedfa7..1036755cb27d 100644
> --- a/rust/kernel/driver.rs
> +++ b/rust/kernel/driver.rs
> @@ -178,11 +178,6 @@ fn of_id_info(_dev: &device::Device) -> Option<&'static Self::IdInfo> {
>      /// If this returns `None`, it means that there is no match in any of the ID tables directly
>      /// associated with a [`device::Device`].
>      fn id_info(dev: &device::Device) -> Option<&'static Self::IdInfo> {
> -        let id = Self::of_id_info(dev);
> -        if id.is_some() {
> -            return id;
> -        }
> -
> -        None

This was intentional, since I anticipated we'll get [1] eventually. :)

[1] https://lore.kernel.org/lkml/20250620153914.295679-1-igor.korotin.linux@gmail.com/

> +        Self::of_id_info(dev)
>      }
>  }
> --
> 2.50.0
> 

Re: [PATCH] rust: simplify `Adapter::id_info`

[Onur]

On Wed, 25 Jun 2025 10:22:48 +0200
Danilo Krummrich <dakr@kernel.org> wrote:

> On Wed, Jun 25, 2025 at 07:36:30AM +0300, Onur Özkan wrote:
> > It was obviously unnecessary to check if `id` is `Some`.
> > 
> > Signed-off-by: Onur Özkan <work@onurozkan.dev>
> > ---
> >  rust/kernel/driver.rs | 7 +------
> >  1 file changed, 1 insertion(+), 6 deletions(-)
> > 
> > diff --git a/rust/kernel/driver.rs b/rust/kernel/driver.rs
> > index ec9166cedfa7..1036755cb27d 100644
> > --- a/rust/kernel/driver.rs
> > +++ b/rust/kernel/driver.rs
> > @@ -178,11 +178,6 @@ fn of_id_info(_dev: &device::Device) ->
> > Option<&'static Self::IdInfo> { /// If this returns `None`, it
> > means that there is no match in any of the ID tables directly ///
> > associated with a [`device::Device`]. fn id_info(dev:
> > &device::Device) -> Option<&'static Self::IdInfo> {
> > -        let id = Self::of_id_info(dev);
> > -        if id.is_some() {
> > -            return id;
> > -        }
> > -
> > -        None
> 
> This was intentional, since I anticipated we'll get [1] eventually. :)
> 
> [1]
> https://lore.kernel.org/lkml/20250620153914.295679-1-igor.korotin.linux@gmail.com/
> 
> > +        Self::of_id_info(dev)
> >      }
> >  }
> > --
> > 2.50.0
> > 

Even with that, it can be something like this:

fn id_info(dev: &device::Device) -> Option<&'static Self::IdInfo> {
    let id = Self::acpi_id_info(dev);
    if id.is_some() {
        return id;
    }

    Self::of_id_info(dev)
}

or maybe even this:

fn id_info(dev: &device::Device) -> Option<&'static Self::IdInfo> {
    Self::acpi_id_info(dev).or_else(|| Self::of_id_info(dev))
}

Re: [PATCH] rust: simplify `Adapter::id_info`

[Danilo Krummrich]

On Wed, Jun 25, 2025 at 11:36:04AM +0300, Onur wrote:
> Even with that, it can be something like this:
> 
> fn id_info(dev: &device::Device) -> Option<&'static Self::IdInfo> {
>     let id = Self::acpi_id_info(dev);
>     if id.is_some() {
>         return id;
>     }
> 
>     Self::of_id_info(dev)
> }
> 
> or maybe even this:
> 
> fn id_info(dev: &device::Device) -> Option<&'static Self::IdInfo> {
>     Self::acpi_id_info(dev).or_else(|| Self::of_id_info(dev))
> }

That's fair, can you please rebase your patch onto [1]?

[1] https://lore.kernel.org/lkml/20250620153914.295679-1-igor.korotin.linux@gmail.com/

Re: [PATCH] rust: simplify `Adapter::id_info`

[Onur]

On Wed, 25 Jun 2025 10:39:47 +0200
Danilo Krummrich <dakr@kernel.org> wrote:

> On Wed, Jun 25, 2025 at 11:36:04AM +0300, Onur wrote:
> > Even with that, it can be something like this:
> > 
> > fn id_info(dev: &device::Device) -> Option<&'static Self::IdInfo> {
> >     let id = Self::acpi_id_info(dev);
> >     if id.is_some() {
> >         return id;
> >     }
> > 
> >     Self::of_id_info(dev)
> > }
> > 
> > or maybe even this:
> > 
> > fn id_info(dev: &device::Device) -> Option<&'static Self::IdInfo> {
> >     Self::acpi_id_info(dev).or_else(|| Self::of_id_info(dev))
> > }
> 
> That's fair, can you please rebase your patch onto [1]?
> 
> [1]
> https://lore.kernel.org/lkml/20250620153914.295679-1-igor.korotin.linux@gmail.com/

HEAD: e0b49ca268d4a0d2b97d5820420d5a78b67d2537 currently doesn't pass
clippy. Should I send an additional change for the clippy fix or would
you prefer to fix it yourself first?

Here is the output of `make LLVM=1 -j $(nproc) CLIPPY=1`:

```
  DESCEND objtool
  CALL    scripts/checksyscalls.sh
  INSTALL libsubcmd_headers
  CLIPPY L rust/kernel.o
error: unneeded `return` statement
   --> rust/kernel/driver.rs:188:13
    |
188 |             return None;
    |             ^^^^^^^^^^^
    |
    = help: for further information visit
https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
= note: `-D clippy::needless-return` implied by `-D warnings` = help:
to override `-D warnings` add `#[allow(clippy::needless_return)]` help:
remove `return` |
188 -             return None;
188 +             None
    |

error: aborting due to 1 previous error

make[2]: *** [rust/Makefile:538: rust/kernel.o] Error 1
make[1]: *** [/home/nimda/devspace/onur-ozkan/linux/Makefile:1280:
prepare] Error 2 make: *** [Makefile:248: __sub-make] Error 2
```

Re: [PATCH] rust: simplify `Adapter::id_info`

[Miguel Ojeda]

On Thu, Jun 26, 2025 at 10:11 AM Onur <work@onurozkan.dev> wrote:
>
> HEAD: e0b49ca268d4a0d2b97d5820420d5a78b67d2537 currently doesn't pass
> clippy. Should I send an additional change for the clippy fix or would
> you prefer to fix it yourself first?

Where is that commit coming from?

Thanks!

Cheers,
Miguel

Re: [PATCH] rust: simplify `Adapter::id_info`

[Danilo Krummrich]

On Thu, Jun 26, 2025 at 11:41:33AM +0200, Miguel Ojeda wrote:
> On Thu, Jun 26, 2025 at 10:11 AM Onur <work@onurozkan.dev> wrote:
> >
> > HEAD: e0b49ca268d4a0d2b97d5820420d5a78b67d2537 currently doesn't pass
> > clippy. Should I send an additional change for the clippy fix or would
> > you prefer to fix it yourself first?

Indeed, this is the case for #[cfg(not(CONFIG_OF))], I'm going to fix this up at
my end when I apply the series. Don't worry about it.

> Where is that commit coming from?

https://git.kernel.org/pub/scm/linux/kernel/git/dakr/linux.git/log/?h=rust/acpi

It's a temporary branch containing patches that are staged for applying them to
the driver-core tree.

Re: [PATCH] rust: simplify `Adapter::id_info`

[Miguel Ojeda]

On Thu, Jun 26, 2025 at 11:48 AM Danilo Krummrich <dakr@kernel.org> wrote:
>
> It's a temporary branch containing patches that are staged for applying them to
> the driver-core tree.

Ah, that explains it -- I checked driver-core but didn't see anything there.

Thanks!

Cheers,
Miguel