From 0242623384c767b1156b61b67894b4ecf6682b8b Mon Sep 17 00:00:00 2001 From: Danilo Krummrich Date: Thu, 16 Oct 2025 14:55:28 +0200 Subject: rust: driver: let probe() return impl PinInit The driver model defines the lifetime of the private data stored in (and owned by) a bus device to be valid from when the driver is bound to a device (i.e. from successful probe()) until the driver is unbound from the device. This is already taken care of by the Rust implementation of the driver model. However, we still ask drivers to return a Result>> from probe(). Unlike in C, where we do not have the concept of initializers, but rather deal with uninitialized memory, drivers can just return an impl PinInit instead. This contributes to more clarity to the fact that a driver returns it's device private data in probe() and the Rust driver model owns the data, manages the lifetime and - considering the lifetime - provides (safe) accessors for the driver. Hence, let probe() functions return an impl PinInit instead of Result>>. Reviewed-by: Alice Ryhl Acked-by: Viresh Kumar Reviewed-by: Alexandre Courbot Acked-by: Greg Kroah-Hartman Signed-off-by: Danilo Krummrich --- samples/rust/rust_driver_platform.rs | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'samples/rust/rust_driver_platform.rs') diff --git a/samples/rust/rust_driver_platform.rs b/samples/rust/rust_driver_platform.rs index 6473baf4f120..d63adb422ba6 100644 --- a/samples/rust/rust_driver_platform.rs +++ b/samples/rust/rust_driver_platform.rs @@ -103,7 +103,7 @@ impl platform::Driver for SampleDriver { fn probe( pdev: &platform::Device, info: Option<&Self::IdInfo>, - ) -> Result>> { + ) -> impl PinInit { let dev = pdev.as_ref(); dev_dbg!(dev, "Probe Rust Platform driver sample.\n"); @@ -116,9 +116,7 @@ impl platform::Driver for SampleDriver { Self::properties_parse(dev)?; } - let drvdata = KBox::new(Self { pdev: pdev.into() }, GFP_KERNEL)?; - - Ok(drvdata.into()) + Ok(Self { pdev: pdev.into() }) } } -- cgit v1.2.3