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coresight: add verification process for coresight_etm_get_trace_id

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The coresight_etm_get_trace_id function is a global function. The
verification process for 'csdev' is required prior to its usage.

Fixes: c367a89dec ("Coresight: Add trace_id function to retrieving the trace ID")
Signed-off-by: Jie Gan <quic_jiegan@quicinc.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250310102724.2112905-1-quic_jiegan@quicinc.com
This commit is contained in:
Jie Gan 2025-03-10 18:27:24 +08:00 committed by Suzuki K Poulose
parent f78d206f3d
commit ab37128ad5
1 changed files with 5 additions and 2 deletions
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7
drivers/hwtracing/coresight/coresight-core.c
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@ -1616,9 +1616,12 @@ EXPORT_SYMBOL_GPL(coresight_remove_driver);
int coresight_etm_get_trace_id(struct coresight_device *csdev, enum cs_mode mode,
struct coresight_device *sink)
{
int trace_id;
int cpu = source_ops(csdev)->cpu_id(csdev);
int cpu, trace_id;
if (csdev->type != CORESIGHT_DEV_TYPE_SOURCE || !source_ops(csdev)->cpu_id)
return -EINVAL;
cpu = source_ops(csdev)->cpu_id(csdev);
switch (mode) {
case CS_MODE_SYSFS:
trace_id = coresight_trace_id_get_cpu_id(cpu);