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    Subject[PATCH 5.10 23/33] perf intel-pt: Fix sync state when a PSB (synchronization) packet is found
    Date
    From: Adrian Hunter <adrian.hunter@intel.com>

    commit ad106a26aef3a95ac7ca88d033b431661ba346ce upstream.

    When syncing, it may be that branch packet generation is not enabled at
    that point, in which case there will not immediately be a control-flow
    packet, so some packets before a control flow packet turns up, get
    ignored. However, the decoder is in sync as soon as a PSB is found, so
    the state should be set accordingly.

    Fixes: f4aa081949e7b6 ("perf tools: Add Intel PT decoder")
    Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: stable@vger.kernel.org # v5.15+
    Link: https://lore.kernel.org/r/20211210162303.2288710-3-adrian.hunter@intel.com
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    [Adrian: Backport to v5.10]
    Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
    +++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
    @@ -2733,7 +2733,7 @@ leap:
    return err;

    decoder->have_last_ip = true;
    - decoder->pkt_state = INTEL_PT_STATE_NO_IP;
    + decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;

    err = intel_pt_walk_psb(decoder);
    if (err)

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