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Simplify the ring buffer handling with the in-place API. Also avoid the dynamic allocation and the memory leak in the channel callback function. Signed-off-by: Dexuan Cui <decui@microsoft.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org>