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| author | Pedro Tammela <pctammela@gmail.com> | 2021-03-25 18:01:15 +0300 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2021-03-26 07:13:24 +0300 |
| commit | 6032ebb54c60cae24329f6aba3ce0c1ca8ad6abe (patch) | |
| tree | e4ad349834f0f3a96193e5e38b9e3e8f1809b068 | |
| parent | 002322402dafd846c424ffa9240a937f49b48c42 (diff) | |
| download | linux-6032ebb54c60cae24329f6aba3ce0c1ca8ad6abe.tar.xz | |
libbpf: Fix bail out from 'ringbuf_process_ring()' on error
The current code bails out with negative and positive returns.
If the callback returns a positive return code, 'ring_buffer__consume()'
and 'ring_buffer__poll()' will return a spurious number of records
consumed, but mostly important will continue the processing loop.
This patch makes positive returns from the callback a no-op.
Fixes: bf99c936f947 ("libbpf: Add BPF ring buffer support")
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210325150115.138750-1-pctammela@mojatatu.com
| -rw-r--r-- | tools/lib/bpf/ringbuf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/lib/bpf/ringbuf.c b/tools/lib/bpf/ringbuf.c index 8caaafe7e312..e7a8d847161f 100644 --- a/tools/lib/bpf/ringbuf.c +++ b/tools/lib/bpf/ringbuf.c @@ -227,7 +227,7 @@ static int ringbuf_process_ring(struct ring* r) if ((len & BPF_RINGBUF_DISCARD_BIT) == 0) { sample = (void *)len_ptr + BPF_RINGBUF_HDR_SZ; err = r->sample_cb(r->ctx, sample, len); - if (err) { + if (err < 0) { /* update consumer pos and bail out */ smp_store_release(r->consumer_pos, cons_pos); |