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Currently, ppp_input_error() indicates an error by allocating a 0-length skb and calling ppp_do_recv(). It takes an error code argument, which is stored in skb->cb, but not used by ppp_receive_frame(). Simplify the error handling by removing the unused parameter and the unnecessary skb allocation. Instead, call ppp_receive_error() directly from ppp_input_error() under the recv lock, and the length check in ppp_receive_frame() can be removed. Signed-off-by: Qingfang Deng <dqfext@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>