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Dmitry Torokhov
7f0b4c25fd
When an input device is allocated with devm_input_allocate_device(), the owner struct device is set as dev->dev.parent and holds the devm_input_device_release resource. Later, input_register_device() attaches the devm_input_device_unregister resource to dev->dev.parent. Clearing or overriding dev->dev.parent before registration splits devres ownership across different devices, which breaks managed lifetime assumptions. Verify via devres_find() that dev->dev.parent is non-NULL and still holds the matching devm_input_device_release entry before registering a managed input device, rejecting registration with -EINVAL otherwise. Also add KUnit test coverage in input_test.c verifying that reparented and NULL-parent managed input devices are rejected while preserving the owner parent succeeds. Assisted-by: LLM Link: https://patch.msgid.link/asmCc1VxVPLIMgY6@google.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>