* [PATCH v2 1/2] rust: pci: remove TryFrom<&Device> implementation for &pci::Device
2026-11-04 19:50 [PATCH v2 0/2] remove TryFrom<&Device> implementations for pci and platform Nicolás Antinori
@ 2026-11-04 19:50 ` Nicolás Antinori
2026-11-04 19:50 ` [PATCH v2 2/2] rust: platform: remove TryFrom<&Device> implementation for &platform::Device Nicolás Antinori
1 sibling, 0 replies; 3+ messages in thread
From: Nicolás Antinori @ 2026-11-04 19:50 UTC (permalink / raw)
To: Igor Korotin, Danilo Krummrich, Georgios Androutsopoulos
Cc: Nicolás Antinori, Alexandre Courbot, Alice Ryhl,
Andreas Hindborg, Benno Lossin, Björn Roy Baron, Boqun Feng,
Daniel Almeida, Gary Guo, Miguel Ojeda, Onur Özkan,
Tamir Duberstein, Trevor Gross, linux-kernel, rust-for-linux
Remove the `TryFrom<&device::Device<Ctx>>` implementation for
`&Device<Ctx>` since it has no remaining users.
This removal also eliminates a pre-existing lifetime soundness issue:
the input and output reference lifetimes were independent, allowing the
conversion of a temporarily borrowed `device::Device` into `&'static
pci::Device` in safe Rust. Removing the device could leave a dangling
reference.
Fixes: 7edc491f6fca ("drm: nova: Use nova-core to read VRAM_BAR_SIZE parameter")
Reported-by: Georgios Androutsopoulos <georgeandrout13@gmail.com>
Link: https://github.com/Rust-for-Linux/linux/issues/1264
Signed-off-by: Nicolás Antinori <nico.antinori.7@gmail.com>
---
rust/helpers/pci.c | 5 -----
rust/kernel/pci.rs | 21 ---------------------
2 files changed, 26 deletions(-)
diff --git a/rust/helpers/pci.c b/rust/helpers/pci.c
index a8540f90b13c..3822b7f47c57 100644
--- a/rust/helpers/pci.c
+++ b/rust/helpers/pci.c
@@ -25,11 +25,6 @@ __rust_helper unsigned long rust_helper_pci_resource_flags(const struct pci_dev
return pci_resource_flags(pdev, bar);
}
-__rust_helper bool rust_helper_dev_is_pci(const struct device *dev)
-{
- return dev_is_pci(dev);
-}
-
__rust_helper unsigned int rust_helper_pci_irq_type(struct pci_dev *pdev)
{
return pci_irq_type(pdev);
diff --git a/rust/kernel/pci.rs b/rust/kernel/pci.rs
index 769d01d23429..0e9455fd544d 100644
--- a/rust/kernel/pci.rs
+++ b/rust/kernel/pci.rs
@@ -6,7 +6,6 @@
use crate::{
bindings,
- container_of,
device,
device_id::{
RawDeviceId,
@@ -535,26 +534,6 @@ fn as_ref(&self) -> &device::Device<Ctx> {
}
}
-impl<Ctx: device::DeviceContext> TryFrom<&device::Device<Ctx>> for &Device<Ctx> {
- type Error = kernel::error::Error;
-
- fn try_from(dev: &device::Device<Ctx>) -> Result<Self, Self::Error> {
- // SAFETY: By the type invariant of `Device`, `dev.as_raw()` is a valid pointer to a
- // `struct device`.
- if !unsafe { bindings::dev_is_pci(dev.as_raw()) } {
- return Err(EINVAL);
- }
-
- // SAFETY: We've just verified that the bus type of `dev` equals `bindings::pci_bus_type`,
- // hence `dev` must be embedded in a valid `struct pci_dev` as guaranteed by the
- // corresponding C code.
- let pdev = unsafe { container_of!(dev.as_raw(), bindings::pci_dev, dev) };
-
- // SAFETY: `pdev` is a valid pointer to a `struct pci_dev`.
- Ok(unsafe { &*pdev.cast() })
- }
-}
-
// SAFETY: A `Device` is always reference-counted and can be released from any thread.
unsafe impl Send for Device {}
--
2.47.3
^ permalink raw reply [flat|nested] 3+ messages in thread* [PATCH v2 2/2] rust: platform: remove TryFrom<&Device> implementation for &platform::Device
2026-11-04 19:50 [PATCH v2 0/2] remove TryFrom<&Device> implementations for pci and platform Nicolás Antinori
2026-11-04 19:50 ` [PATCH v2 1/2] rust: pci: remove TryFrom<&Device> implementation for &pci::Device Nicolás Antinori
@ 2026-11-04 19:50 ` Nicolás Antinori
1 sibling, 0 replies; 3+ messages in thread
From: Nicolás Antinori @ 2026-11-04 19:50 UTC (permalink / raw)
To: Igor Korotin, Danilo Krummrich, Georgios Androutsopoulos
Cc: Nicolás Antinori, Alexandre Courbot, Alice Ryhl,
Andreas Hindborg, Benno Lossin, Björn Roy Baron, Boqun Feng,
Daniel Almeida, Gary Guo, Miguel Ojeda, Onur Özkan,
Tamir Duberstein, Trevor Gross, linux-kernel, rust-for-linux
Remove the `TryFrom<&device::Device<Ctx>>` implementation for
`&Device<Ctx>` as it has had no users since its introduction.
This removal also eliminates a pre-existing lifetime soundness issue:
the input and output reference lifetimes were independent, allowing the
conversion of a temporarily borrowed `device::Device` into `&'static
platform::Device` in safe Rust. Removing the device could leave a
dangling reference.
Fixes: a38dfd60fe53 ("rust: platform: impl TryFrom<&Device> for &platform::Device")
Reported-by: Georgios Androutsopoulos <georgeandrout13@gmail.com>
Link: https://github.com/Rust-for-Linux/linux/issues/1264
Signed-off-by: Nicolás Antinori <nico.antinori.7@gmail.com>
---
rust/helpers/helpers.c | 1 -
rust/helpers/platform.c | 8 --------
rust/kernel/platform.rs | 21 ---------------------
3 files changed, 30 deletions(-)
delete mode 100644 rust/helpers/platform.c
diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c
index d62c7be1ca7b..787dd8ff8c6c 100644
--- a/rust/helpers/helpers.c
+++ b/rust/helpers/helpers.c
@@ -82,7 +82,6 @@
#include "page.c"
#include "pci.c"
#include "pid_namespace.c"
-#include "platform.c"
#include "poll.c"
#include "processor.c"
#include "property.c"
diff --git a/rust/helpers/platform.c b/rust/helpers/platform.c
deleted file mode 100644
index 188b3240f32d..000000000000
--- a/rust/helpers/platform.c
+++ /dev/null
@@ -1,8 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-
-#include <linux/platform_device.h>
-
-__rust_helper bool rust_helper_dev_is_platform(const struct device *dev)
-{
- return dev_is_platform(dev);
-}
diff --git a/rust/kernel/platform.rs b/rust/kernel/platform.rs
index ac0a012ae1bb..f49aedcc94b1 100644
--- a/rust/kernel/platform.rs
+++ b/rust/kernel/platform.rs
@@ -7,7 +7,6 @@
use crate::{
acpi,
bindings,
- container_of,
device::{
self,
Bound, //
@@ -557,26 +556,6 @@ fn as_ref(&self) -> &device::Device<Ctx> {
}
}
-impl<Ctx: device::DeviceContext> TryFrom<&device::Device<Ctx>> for &Device<Ctx> {
- type Error = kernel::error::Error;
-
- fn try_from(dev: &device::Device<Ctx>) -> Result<Self, Self::Error> {
- // SAFETY: By the type invariant of `Device`, `dev.as_raw()` is a valid pointer to a
- // `struct device`.
- if !unsafe { bindings::dev_is_platform(dev.as_raw()) } {
- return Err(EINVAL);
- }
-
- // SAFETY: We've just verified that the bus type of `dev` equals
- // `bindings::platform_bus_type`, hence `dev` must be embedded in a valid
- // `struct platform_device` as guaranteed by the corresponding C code.
- let pdev = unsafe { container_of!(dev.as_raw(), bindings::platform_device, dev) };
-
- // SAFETY: `pdev` is a valid pointer to a `struct platform_device`.
- Ok(unsafe { &*pdev.cast() })
- }
-}
-
// SAFETY: A `Device` is always reference-counted and can be released from any thread.
unsafe impl Send for Device {}
--
2.47.3
^ permalink raw reply [flat|nested] 3+ messages in thread