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

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
This commit is contained in:
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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2
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);
}