Danilo Krummrich f5d3ef25d2 rust: devres: get rid of Devres' inner Arc ... So far Devres uses an inner memory allocation and reference count, i.e. an inner Arc, in order to ensure that the devres callback can't run into a use-after-free in case where the Devres object is dropped while the devres callback runs concurrently. Instead, use a completion in order to avoid a potential UAF: In Devres::drop(), if we detect that we can't remove the devres action anymore, we wait for the completion that is completed from the devres callback. If, in turn, we were able to successfully remove the devres action, we can just go ahead. This, again, allows us to get rid of the internal Arc, and instead let Devres consume an `impl PinInit<T, E>` in order to return an `impl PinInit<Devres<T>, E>`, which enables us to get away with less memory allocations. Additionally, having the resulting explicit synchronization in Devres::drop() prevents potential subtle undesired side effects of the devres callback dropping the final Arc reference asynchronously within the devres callback. Reviewed-by: Benno Lossin <lossin@kernel.org> Reviewed-by: Boqun Feng <boqun.feng@gmail.com> Link: https://lore.kernel.org/r/20250626200054.243480-4-dakr@kernel.org [ Move '# Invariants' below '# Examples'. - Danilo ] Signed-off-by: Danilo Krummrich <dakr@kernel.org>		2025-06-28 18:08:50 +02:00
..
alloc	rust: alloc: add missing Markdown code span	2025-05-25 22:58:35 +02:00
block	rust: pin-init: change blanket impls for [Pin]Init and add one for Result<T, E>	2025-06-11 21:13:56 +02:00
device	rust: device: implement FwNode::is_of_node()	2025-06-25 18:10:12 +02:00
drm	rust: devres: replace Devres::new_foreign_owned()	2025-06-28 18:06:53 +02:00
fs	rust: file: improve safety comments	2025-05-30 07:12:05 +02:00
list	rust: list: Fix typo much in arc.rs	2025-05-29 23:35:44 +02:00
mm	mm: rust: make CONFIG_MMU ifdefs more narrow	2025-05-31 22:46:12 -07:00
net	net: phy: pass PHY driver to .match_phy_device OP	2025-05-21 15:56:09 -07:00
sync	rust: completion: implement initial abstraction	2025-06-13 23:46:56 +02:00
time	rust: time: Fix compile error in impl_has_hr_timer macro	2025-06-10 20:11:36 +02:00
.gitignore	rust: jump_label: skip formatting generated file	2024-11-20 13:32:42 -05:00
acpi.rs	rust: acpi: add acpi::DeviceId abstraction	2025-06-26 23:22:17 +02:00
alloc.rs	rust: alloc: add missing Markdown code spans	2025-05-25 22:58:35 +02:00
auxiliary.rs	Rust changes for v6.16	2025-06-04 21:18:37 -07:00
block.rs	rust: block: introduce kernel::block::mq module	2024-06-14 07:45:04 -06:00
build_assert.rs	rust: add build_error! to the prelude	2025-01-10 00:19:09 +01:00
clk.rs	rust: clk: Add initial abstractions	2025-05-19 12:55:40 +05:30
configfs.rs	Rust changes for v6.16	2025-06-04 21:18:37 -07:00
cpu.rs	rust: cpu: Add CpuId::current() to retrieve current CPU ID	2025-06-12 10:31:28 +05:30
cpufreq.rs	rust: devres: replace Devres::new_foreign_owned()	2025-06-28 18:06:53 +02:00
cpumask.rs	rust: Use CpuId in place of raw CPU numbers	2025-06-12 10:31:28 +05:30
cred.rs	cred,rust: mark Credential methods inline	2025-03-04 17:07:49 -05:00
device.rs	rust: device: Move property_present() to FwNode	2025-06-13 00:58:52 +02:00
device_id.rs	rust: use absolute paths in macros referencing core and kernel	2025-05-23 00:12:14 +02:00
devres.rs	rust: devres: get rid of Devres' inner Arc	2025-06-28 18:08:50 +02:00
dma.rs	Rust changes for v6.16	2025-06-04 21:18:37 -07:00
driver.rs	rust: driver: Add ACPI id table support to Adapter trait	2025-06-26 23:26:10 +02:00
error.rs	Rust changes for v6.15	2025-03-30 17:03:26 -07:00
faux.rs	rust/kernel/faux: mark Registration methods inline	2025-03-11 10:42:23 +01:00
firmware.rs	rust: firmware: Use ffi::c_char type in FwFunc	2025-04-14 14:13:23 +02:00
fs.rs	rust: file: add Rust abstraction for struct file	2024-09-30 13:02:28 +02:00
generated_arch_static_branch_asm.rs.S	rust: jump_label: skip formatting generated file	2024-11-20 13:32:42 -05:00
init.rs	Rust changes for v6.15	2025-03-30 17:03:26 -07:00
io.rs	rust: io: rename io::Io accessors	2025-02-22 15:44:19 +01:00
ioctl.rs	rust: start using the #[expect(...)] attribute	2024-10-07 21:39:57 +02:00
jump_label.rs	rust: jump_label: skip formatting generated file	2024-11-20 13:32:42 -05:00
kunit.rs	rust: add kunit_tests to the prelude	2025-05-27 20:09:59 +02:00
lib.rs	rust: acpi: add acpi::DeviceId abstraction	2025-06-26 23:22:17 +02:00
list.rs	rust: list: Add examples for linked list	2025-05-22 12:00:52 +02:00
miscdevice.rs	Char/Misc/IIO pull request for 6.16-rc1	2025-06-06 11:50:47 -07:00
mm.rs	mm: rust: make CONFIG_MMU ifdefs more narrow	2025-05-31 22:46:12 -07:00
net.rs	rust: core abstractions for network PHY drivers	2023-12-15 09:35:50 +00:00
of.rs	rust: of: add of::DeviceId abstraction	2024-12-20 17:21:04 +01:00
opp.rs	rust: opp: Move cfg(CONFIG_OF) attribute to the top of doc test	2025-05-27 15:29:17 +02:00
page.rs	rust: page: optimize rust symbol generation for Page	2025-05-12 00:20:25 +02:00
pci.rs	rust: devres: get rid of Devres' inner Arc	2025-06-28 18:08:50 +02:00
pid_namespace.rs	rust: add PidNamespace	2024-10-08 15:44:36 +02:00
platform.rs	rust: platform: Add ACPI match table support to Driver trait	2025-06-26 23:26:15 +02:00
prelude.rs	rust: add kunit_tests to the prelude	2025-05-27 20:09:59 +02:00
print.rs	rust: replace rustdoc references to alloc::format	2025-05-12 00:20:25 +02:00
rbtree.rs	rust: retain pointer mut-ness in container_of!	2025-05-28 18:54:09 +02:00
revocable.rs	rust: revocable: support fallible PinInit types	2025-06-28 18:06:52 +02:00
security.rs	lsm,rust: reword "destroy" -> "release" in SecurityCtx	2025-03-04 15:44:46 -05:00
seq_file.rs	Rust changes for v6.15	2025-03-30 17:03:26 -07:00
sizes.rs	rust: sizes: add commonly used constants	2024-08-30 10:27:34 +01:00
static_assert.rs	rust: use absolute paths in macros referencing core and kernel	2025-05-23 00:12:14 +02:00
std_vendor.rs	rust: convert raw URLs to Markdown autolinks in comments	2025-05-12 00:20:25 +02:00
str.rs	rust: str: take advantage of the -> Result support in KUnit #[test]'s	2025-05-27 20:09:59 +02:00
sync.rs	rust: completion: implement initial abstraction	2025-06-13 23:46:56 +02:00
task.rs	rust: task: add missing Markdown code spans and intra-doc links	2025-05-25 22:58:35 +02:00
time.rs	rust: time: Introduce Instant type	2025-04-29 15:31:07 +02:00
tracepoint.rs	rust: add tracepoint support	2024-11-04 16:21:44 -05:00
transmute.rs	rust: kernel: move FromBytes and AsBytes traits to a new transmute module	2024-10-10 00:33:42 +02:00
types.rs	rust: implement Wrapper<T> for Opaque<T>	2025-06-28 14:58:08 +02:00
uaccess.rs	Alloc changes for v6.16	2025-05-18 20:56:03 +02:00
workqueue.rs	rust: workqueue: remove HasWork::OFFSET	2025-05-29 01:34:52 +02:00
xarray.rs	rust: xarray: Add an abstraction for XArray	2025-05-01 11:37:59 +02:00