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Message-ID: <F599F062-5519-4DC4-8303-7630BE0B900A@kloenk.dev>
Date: Thu, 05 Dec 2024 21:23:03 +0100
From: Fiona Behrens <me@...enk.dev>
To: Lee Jones <lee@...nel.org>
Cc: linux-kernel@...r.kernel.org, arnd@...db.de, gregkh@...uxfoundation.org,
ojeda@...nel.org, alex.gaynor@...il.com, boqun.feng@...il.com,
gary@...yguo.net, bjorn3_gh@...tonmail.com, benno.lossin@...ton.me,
a.hindborg@...nel.org, aliceryhl@...gle.com, tmgross@...ch.edu,
rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v3 1/5] rust: miscdevice: Provide accessor to pull out
miscdevice::this_device
On 5 Dec 2024, at 17:25, Lee Jones wrote:
> There are situations where a pointer to a `struct device` will become
> necessary (e.g. for calling into dev_*() functions). This accessor
> allows callers to pull this out from the `struct miscdevice`.
>
> Signed-off-by: Lee Jones <lee@...nel.org>
> ---
> rust/kernel/miscdevice.rs | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/rust/kernel/miscdevice.rs b/rust/kernel/miscdevice.rs
> index 7e2a79b3ae26..55340f316006 100644
> --- a/rust/kernel/miscdevice.rs
> +++ b/rust/kernel/miscdevice.rs
> @@ -10,11 +10,13 @@
>
> use crate::{
> bindings,
> + device::Device,
> error::{to_result, Error, Result, VTABLE_DEFAULT_ERROR},
> prelude::*,
> str::CStr,
> types::{ForeignOwnable, Opaque},
> };
> +
> use core::{
> ffi::{c_int, c_long, c_uint, c_ulong},
> marker::PhantomData,
> @@ -84,6 +86,13 @@ pub fn register(opts: MiscDeviceOptions) -> impl PinInit<Self, Error> {
> pub fn as_raw(&self) -> *mut bindings::miscdevice {
> self.inner.get()
> }
> +
> + /// Returns a pointer to the current Device
I would not call this pointer but rather reference? Pointer is usually associated with *mut or *const, and this is a reference to the Device abstraction
Thanks,
- Fiona
> + pub fn device(&self) -> &Device {
> + // SAFETY: This is only accessible after a successful register() which always
> + // initialises this_device with a valid device.
> + unsafe { Device::as_ref((*self.as_raw()).this_device) }
> + }
> }
>
> #[pinned_drop]
> --
> 2.47.0.338.g60cca15819-goog
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