linux-kernel - [PATCH v4 2/2] samples: rust: convert PCI rust sample driver to use try_access

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Message-Id: <20250411-try_with-v4-2-f470ac79e2e2@nvidia.com>
Date: Fri, 11 Apr 2025 21:09:39 +0900
From: Alexandre Courbot <acourbot@...dia.com>
To: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
 Danilo Krummrich <dakr@...nel.org>, 
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
 Benno Lossin <benno.lossin@...ton.me>, 
 Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Trevor Gross <tmgross@...ch.edu>, Bjorn Helgaas <bhelgaas@...gle.com>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-pci@...r.kernel.org, Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH v4 2/2] samples: rust: convert PCI rust sample driver to
 use try_access_with()

This method limits the scope of the revocable guard and is considered
safer to use for most cases, so let's showcase it here.

Acked-by: Danilo Krummrich <dakr@...nel.org>
Reviewed-by: Benno Lossin <benno.lossin@...ton.me>
Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
 samples/rust/rust_driver_pci.rs | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/samples/rust/rust_driver_pci.rs b/samples/rust/rust_driver_pci.rs
index 2bb260aebc9eae24db431238d7d7b48fbad788b4..9ce3a7323a1632e08f833a14c3f49a4218e9a5e6 100644
--- a/samples/rust/rust_driver_pci.rs
+++ b/samples/rust/rust_driver_pci.rs
@@ -83,13 +83,12 @@ fn probe(pdev: &pci::Device<Core>, info: &Self::IdInfo) -> Result<Pin<KBox<Self>
             GFP_KERNEL,
         )?;
 
-        let bar = drvdata.bar.try_access().ok_or(ENXIO)?;
+        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",
-            Self::testdev(info, &bar)?
-        );
+        dev_info!(pdev.as_ref(), "pci-testdev data-match count: {}\n", res);
 
         Ok(drvdata.into())
     }

-- 
2.49.0