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While porting, extend coverage of the BPF_LIRC_MODE2 attach/detach/
query API:
- bpf_prog_attach() with invalid flags is rejected with -EINVAL
and does not attach the program
- bpf_prog_query() with invalid flags is rejected with -EINVAL
without disturbing existing attachments
- bpf_prog_query() reports the correct program id, not just count,
at each step, via bpf_prog_get_info_by_fd()
- a lirc chardev can hold more than one attached program: load a
second, independent instance, attach it alongside the first,
confirm both are reported by bpf_prog_query(), then detach it
without disturbing the first program's attachment
- detaching an already-detached program consistently fails with
-ENOENT, for both the first and second program
Signed-off-by: Sean Young <sean@mess.org>
Assisted-by: Claude:claude-sonnet-5
Link: https://lore.kernel.org/bpf/20260820214332.89030-1-sean@mess.org
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
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