[PATCH 3/3] samples: rust: pci: take advantage of Devres::access_with()

Danilo Krummrich
2025-04-26T13:33:47Z

For the I/O operations executed from the probe() method, take advantage
of Devres::access_with(), avoiding the atomic check and RCU read lock
required otherwise entirely.

Signed-off-by: Danilo Krummrich <dakr@kernel.org>
---
samples/rust/rust_driver_pci.rs | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/samples/rust/rust_driver_pci.rs b/samples/rust/rust_driver_pci.rs
index 9ce3a7323a16..3e1569e5096e 100644
--- a/samples/rust/rust_driver_pci.rs
+++ b/samples/rust/rust_driver_pci.rs
@@ -83,12 +83,12 @@ fn probe(pdev: &pci::Device<Core>, info: &Self::IdInfo) -> Result<Pin<KBox<Self>
GFP_KERNEL,
)?;

- let res = drvdata
- .bar
- .try_access_with(|b| Self::testdev(info, b))
- .ok_or(ENXIO)??;
-
- dev_info!(pdev.as_ref(), "pci-testdev data-match count: {}\n", res);
+ let bar = drvdata.bar.access_with(pdev.as_ref())?;
+ dev_info!(
+ pdev.as_ref(),
+ "pci-testdev data-match count: {}\n",
+ Self::testdev(info, bar)?
+ );

Ok(drvdata.into())
}
--
2.49.0