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coresight: etm4x: Add lock for reading virtual context ID comparator

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Updates to the values and the index are protected via the spinlock.
Ensure we use the same lock to read the value safely.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20220204152403.71775-2-leo.yan@linaro.org
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Leo Yan 2022-02-04 23:24:00 +08:00 committed by Suzuki K Poulose
parent ef1dacf4b3
commit bf0ef4f12c
1 changed files with 2 additions and 0 deletions
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drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
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@ -2115,7 +2115,9 @@ static ssize_t vmid_val_show(struct device *dev,
struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
struct etmv4_config *config = &drvdata->config;
spin_lock(&drvdata->spinlock);
val = (unsigned long)config->vmid_val[config->vmid_idx];
spin_unlock(&drvdata->spinlock);
return scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
}