From: Danilo Krummrich <dakr@kernel.org>
To: Boqun Feng <boqun.feng@gmail.com>
Cc: gregkh@linuxfoundation.org, rafael@kernel.org, ojeda@kernel.org,
alex.gaynor@gmail.com, gary@garyguo.net,
bjorn3_gh@protonmail.com, lossin@kernel.org,
a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu,
david.m.ertman@intel.com, ira.weiny@intel.com, leon@kernel.org,
kwilczynski@kernel.org, bhelgaas@google.com,
rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-pci@vger.kernel.org
Subject: Re: [PATCH v2 3/4] rust: devres: get rid of Devres' inner Arc
Date: Tue, 24 Jun 2025 17:18:23 +0200 [thread overview]
Message-ID: <aFrBvwFrUGD45TeF@cassiopeiae> (raw)
In-Reply-To: <aFizv7suXTADJU3f@Mac.home>
On Sun, Jun 22, 2025 at 06:54:07PM -0700, Boqun Feng wrote:
> I think you also need to mention that `inner` only remains valid until
> `inner.devm.complete_all()` unblocks `Devres::drop()`, because after
> `Devres::drop()`'s `devm.wait_for_completion()` returns, `inner` may be
> dropped or freed.
I think of it the other way around: The invariant guarantees that `inner` is
*always* valid.
The the `drop_in_place(inner)` call has to justify that it upholds this
invariant, by ensuring that at the time it is called no other code that accesses
`inner` can ever run.
Defining it the other way around would make the `inner()` accessor unsafe.
next prev parent reply other threads:[~2025-06-24 15:18 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-22 16:40 [PATCH v2 0/4] Improvements for Devres Danilo Krummrich
2025-06-22 16:40 ` [PATCH v2 1/4] rust: revocable: support fallible PinInit types Danilo Krummrich
2025-06-22 20:23 ` Benno Lossin
2025-06-22 20:30 ` Miguel Ojeda
2025-06-23 11:53 ` Alice Ryhl
2025-06-22 16:40 ` [PATCH v2 2/4] rust: devres: replace Devres::new_foreign_owned() Danilo Krummrich
2025-06-22 20:25 ` Benno Lossin
2025-06-23 11:56 ` Alice Ryhl
2025-06-23 12:41 ` Danilo Krummrich
2025-06-22 16:40 ` [PATCH v2 3/4] rust: devres: get rid of Devres' inner Arc Danilo Krummrich
2025-06-22 20:45 ` Benno Lossin
2025-06-22 21:09 ` Danilo Krummrich
2025-06-23 1:54 ` Boqun Feng
2025-06-24 15:18 ` Danilo Krummrich [this message]
2025-06-24 15:46 ` Boqun Feng
2025-06-24 16:15 ` Danilo Krummrich
2025-06-24 16:20 ` Danilo Krummrich
2025-06-24 16:37 ` Boqun Feng
2025-06-22 16:40 ` [PATCH v2 4/4] rust: devres: implement register_release() Danilo Krummrich
2025-06-22 20:47 ` Benno Lossin
2025-06-22 21:12 ` Danilo Krummrich
2025-06-22 21:20 ` Benno Lossin
2025-06-22 21:24 ` Danilo Krummrich
2025-06-22 22:29 ` Benno Lossin
2025-06-23 12:01 ` Alice Ryhl
2025-06-23 12:51 ` Danilo Krummrich
2025-06-23 13:40 ` Benno Lossin
2025-06-23 13:49 ` Danilo Krummrich
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