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| author | Leo Yan <leo.yan@linaro.org> | 2022-02-04 23:24:00 +0800 |
|---|---|---|
| committer | Suzuki K Poulose <suzuki.poulose@arm.com> | 2022-03-11 10:07:47 +0000 |
| commit | bf0ef4f12c6303879c04e05ce43ea37ac56ebfa6 (patch) | |
| tree | 43f6ef8c385ea335c7fe3fb69b69417026c34878 | |
| parent | ef1dacf4b3e23dae57d741bb592a3393428c5a7d (diff) | |
| download | iio-bf0ef4f12c6303879c04e05ce43ea37ac56ebfa6.tar.gz | |
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
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x-sysfs.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c index 57e94424a8d65d..c376f9e230d362 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c @@ -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); } |