[PATCH] coresight: cti: Check if the CPU activated for the CPU CTI

[Tao Zhang]

Check whether the CPU corresponding to the CPU CTI is activated.
If it is not activated, the CPU CTI node should not exist, and
an error will be returned in the initialization function.

Signed-off-by: Tao Zhang <quic_taozha at quicinc.com>
---
 drivers/hwtracing/coresight/coresight-cti-core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-cti-core.c b/drivers/hwtracing/coresight/coresight-cti-core.c
index 277c890..aaa83ae 100644
--- a/drivers/hwtracing/coresight/coresight-cti-core.c
+++ b/drivers/hwtracing/coresight/coresight-cti-core.c
@@ -899,10 +899,12 @@ static int cti_probe(struct amba_device *adev, const struct amba_id *id)
 	drvdata->config.hw_powered = true;
 
 	/* set up device name - will depend if cpu bound or otherwise */
-	if (drvdata->ctidev.cpu >= 0)
+	if (drvdata->ctidev.cpu >= 0) {
+		if (!cpu_active(drvdata->ctidev.cpu))
+			return -ENXIO;
 		cti_desc.name = devm_kasprintf(dev, GFP_KERNEL, "cti_cpu%d",
 					       drvdata->ctidev.cpu);
-	else
+	} else
 		cti_desc.name = coresight_alloc_device_name(&cti_sys_devs, dev);
 	if (!cti_desc.name)
 		return -ENOMEM;
-- 
2.7.4