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bpf: Reset prog callback in bpf_async_cancel_and_free()

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Replace prog and callback in bpf_async_cb after removing visibility of
bpf_async_cb in bpf_async_cancel_and_free() to increase the chances the
scheduled async callbacks short-circuit execution and exit early, and
not starting a RCU tasks trace section. This improves the overall time
spent in running the wq selftest.

Suggested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260205003853.527571-3-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Kumar Kartikeya Dwivedi 2026-02-04 16:38:53 -08:00 • committed by Alexei Starovoitov
parent 81502d7f20
commit 5000a097f8
1 changed files with 1 additions and 0 deletions
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kernel/bpf/helpers.c
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@ -1664,6 +1664,7 @@ static void bpf_async_cancel_and_free(struct bpf_async_kern *async)
if (!cb)
return;
bpf_async_update_prog_callback(cb, NULL, NULL);
/*
* No refcount_inc_not_zero(&cb->refcnt) here. Dropping the last
* refcnt. Either synchronously or asynchronously in irq_work.