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perf intel-pt: Fix error recovery from missing TIP packet 

When a TIP packet is expected but there is a different packet, it is an
error. However the unexpected packet might be something important like a
TSC packet, so after the error, it is necessary to continue from there,
rather than the next packet. That is achieved by setting pkt_step to
zero.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1520431349-30689-4-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
zero-colors
Adrian Hunter 2018-03-07 16:02:23 +02:00 committed by Arnaldo Carvalho de Melo
parent 63d8e38f6a
commit 1c196a6c77
1 changed files with 1 additions and 0 deletions
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tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
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@ -1616,6 +1616,7 @@ static int intel_pt_walk_fup_tip(struct intel_pt_decoder *decoder)
case INTEL_PT_PWRX:
intel_pt_log("ERROR: Missing TIP after FUP\n");
decoder->pkt_state = INTEL_PT_STATE_ERR3;
decoder->pkt_step = 0;
return -ENOENT;
case INTEL_PT_OVF: