Optimize the Coresight Trace id allocation logic - #1032
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Jie Gan (jiegan0107) wants to merge 2 commits into
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Optimize the Coresight Trace id allocation logic#1032Jie Gan (jiegan0107) wants to merge 2 commits into
Jie Gan (jiegan0107) wants to merge 2 commits into
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When coresight_path_assign_trace_id() cannot assign a valid trace ID, coresight_enable_sysfs() takes the err_path goto with ret still 0, returning success to the caller despite no trace session being started. Change coresight_path_assign_trace_id() to return int, moving the IS_VALID_CS_TRACE_ID() check inside it so it returns -EINVAL on failure and 0 on success. Update both callers to propagate this return value directly instead of inspecting path->trace_id after the call. Fixes: d87d76d ("Coresight: Allocate trace ID after building the path") Reviewed-by: James Clark <james.clark@linaro.org> Reviewed-by: Richard Cheng <icheng@nvidia.com> Signed-off-by: Jie Gan <jie.gan@oss.qualcomm.com> Reviewed-by: Leo Yan <leo.yan@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20260512-fix-trace-id-error-v4-1-eb3de789767a@oss.qualcomm.com
Jie Gan (jiegan0107)
requested review from
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Amit Kucheria (idlethread),
jingyiwang42 and
Kaushal Kumar (quic-kaushalk)
August 31, 2026 02:42
…n-AMBA tnoc For a tnoc device not on the AMBA bus, atid was set to -EOPNOTSUPP. trace_noc_id() returns this value directly to coresight_path_assign_trace_id(), which only treats a literal 0 return as "this device has no ID, keep searching the path" - any other value is checked against IS_VALID_CS_TRACE_ID() and rejected. A negative atid therefore made path assignment fail with -EINVAL instead of falling through to the next device in the path that could supply a valid trace ID. Use 0, the same sentinel coresight_path_assign_trace_id() already recognizes as "not allocated", instead of -EOPNOTSUPP. Link: https://lore.kernel.org/all/20260902-fix-trace-id-error-in-tnoc-driver-v2-1-73669a947297@oss.qualcomm.com/ Fixes: 5799dee ("coresight-tnoc: add platform driver to support Interconnect TNOC") Signed-off-by: Jie Gan <jie.gan@oss.qualcomm.com>
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The patch[1] has been posted based on latest upstream tip. On the qli2.0 tip, the patch[1] is conflict with another ongoing patch[2]. So, rebased it on top of the conflict patch [2]. [1] FROMLIST: coresight: tnoc: fix trace ID path assignment failure on non-AMBA tnoc |
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Optimize the Coresight Trace id allocation logic
CRs-Fixed: 4661884