Commit bf0ef4f1 authored by Leo Yan's avatar Leo Yan Committed by Suzuki K Poulose
Browse files

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: default avatarLeo Yan <leo.yan@linaro.org>
Reviewed-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20220204152403.71775-2-leo.yan@linaro.org
parent ef1dacf4

drivers/hwtracing/coresight/coresight-etm4x-sysfs.c

+2 −0
Original line number Diff line number Diff line
@@ -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);

}