perf intel-pt: Fix divide by zero when TSC is not available
commit 076333870c
upstream.
When TSC is not available, "timeless" decoding is used but a divide by
zero occurs if perf_time_to_tsc() is called.
Ensure the divisor is not zero.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: stable@vger.kernel.org # v4.9+
Link: https://lkml.kernel.org/n/tip-1i4j0wqoc8vlbkcizqqxpsf4@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -2259,6 +2259,8 @@ int intel_pt_process_auxtrace_info(union perf_event *event,
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}
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pt->timeless_decoding = intel_pt_timeless_decoding(pt);
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if (pt->timeless_decoding && !pt->tc.time_mult)
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pt->tc.time_mult = 1;
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pt->have_tsc = intel_pt_have_tsc(pt);
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pt->sampling_mode = false;
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pt->est_tsc = !pt->timeless_decoding;
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