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377563ce06
The struct revocable handle stores the SRCU read-side index (idx) for the duration of a resource access. If multiple threads share the same struct revocable instance, they race on writing to the idx field, corrupting the SRCU state and potentially causing unsafe unlocks. Refactor the API to replace revocable_alloc()/revocable_free() with revocable_init()/revocable_deinit(). This change requires the caller to provide the storage for struct revocable. By moving storage ownership to the caller, the API ensures that concurrent users maintain their own private idx storage, eliminating the race condition. Reported-by: Johan Hovold <johan@kernel.org> Closes: https://lore.kernel.org/all/20260124170535.11756-4-johan@kernel.org/ Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org> Link: https://patch.msgid.link/20260129143733.45618-4-tzungbi@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>