rust: auxiliary: unregister on parent device unbind

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Guarantee that an auxiliary driver will be unbound before its parent is
unbound; there is no point in operating an auxiliary device whose parent
has been unbound.

In practice, this guarantee allows us to assume that for a bound
auxiliary device, also the parent device is bound.

This is useful when an auxiliary driver calls into its parent, since it
allows the parent to directly access device resources and its device
private data due to the guaranteed bound device context.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

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This commit is contained in:

Danilo Krummrich 2025-10-21 00:34:26 +02:00

parent 589b061975

commit e4e679c860

3 changed files with 66 additions and 48 deletions

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8

drivers/gpu/nova-core/driver.rs

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83

rust/kernel/auxiliary.rs

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17

samples/rust/rust_driver_auxiliary.rs

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