rust: pci: return DevresLt from Bar::into_devres()

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Implement ForLt and CovariantForLt for Bar<'static, SIZE> so that
DevresLt can shorten the stored 'static lifetime back to the caller's
borrow lifetime.

CovariantForLt is sound because Bar<'a, SIZE> only holds &'a
Device<Bound>, which is covariant over 'a.

Since DevresLt::new() handles the lifetime transmutation internally,
into_devres() no longer needs an explicit transmute to Bar<'static>.

Add a DevresBar<SIZE> type alias for convenience.

Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Link: https://patch.msgid.link/20260626183630.2585057-7-dakr@kernel.org
[ Add default SIZE parameter to DevresBar. - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

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Danilo Krummrich 2026-06-26 20:36:13 +02:00

parent b85f672a3e

commit e7e6bf5af8

2 changed files with 27 additions and 11 deletions

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rust/kernel/pci.rs

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37

rust/kernel/pci/io.rs

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