From: Adrian Hunter <adrian.hunter@intel.com>

Date: Fri, 10 Dec 2021 18:22:58 +0200

Subject: perf intel-pt: Fix sync state when a PSB (synchronization) packet is

 found

Git-commit: ad106a26aef3a95ac7ca88d033b431661ba346ce

Patch-mainline: v5.16-rc5

References: git-fixes

​

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>

Signed-off-by: Tony Jones <tonyj@suse.de>

---

 tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

​

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c

index 6f6f163161a9..bddf98123dc3 100644

--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c

+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c

@@ -3608,7 +3608,7 @@ static int intel_pt_sync(struct intel_pt_decoder *decoder)

    }

    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)

​

​