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In the ensure_good_fd function, if the fcntl function succeeds but the close function fails, ensure_good_fd returns a normal fd and sets errno, which may cause users to misunderstand. The close failure is not a serious problem, and the correct FD has been handed over to the upper-layer application. Let's restore errno here. Signed-off-by: Xin Liu <liuxin350@huawei.com> Link: https://lore.kernel.org/r/20221223133618.10323-1-liuxin350@huawei.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>