linux-kernel - [PATCH v2 6/8] coresight: Move sink validation into etm_perf_add_symlink

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Message-Id: <20260126-arm_coresight_refactor_dev_register-v2-6-b5a3c0441c15@arm.com>
Date: Mon, 26 Jan 2026 13:52:06 +0000
From: Leo Yan <leo.yan@....com>
To: Suzuki K Poulose <suzuki.poulose@....com>, 
 Mike Leach <mike.leach@...aro.org>, James Clark <james.clark@...aro.org>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Mathieu Poirier <mathieu.poirier@...aro.org>, 
 Mao Jinlong <quic_jinlmao@...cinc.com>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, Leo Yan <leo.yan@....com>
Subject: [PATCH v2 6/8] coresight: Move sink validation into
 etm_perf_add_symlink_sink()

Move the sink device type checks into etm_perf_add_symlink_sink(), and
return -EOPNOTSUPP for unsupported devices.  This simplifies the
registration flow to invoke etm_perf_add_symlink_sink() unconditionally.

Signed-off-by: Leo Yan <leo.yan@....com>
---
 drivers/hwtracing/coresight/coresight-core.c     | 23 +++++++++--------------
 drivers/hwtracing/coresight/coresight-etm-perf.c |  5 ++++-
 2 files changed, 13 insertions(+), 15 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index 74fdaf3f445d139b493c2d3041884550931291b3..5c29f78de7f115d61f550dea62b6538940ec9182 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -1380,21 +1380,16 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
 		goto out_unlock;
 	}
 
-	if ((csdev->type == CORESIGHT_DEV_TYPE_SINK ||
-	     csdev->type == CORESIGHT_DEV_TYPE_LINKSINK) &&
-	    sink_ops(csdev)->alloc_buffer) {
-		ret = etm_perf_add_symlink_sink(csdev);
+	ret = etm_perf_add_symlink_sink(csdev);
 
-		if (ret) {
-			device_unregister(&csdev->dev);
-			/*
-			 * As with the above, all resources are free'd
-			 * explicitly via coresight_device_release() triggered
-			 * from put_device(), which is in turn called from
-			 * function device_unregister().
-			 */
-			goto out_unlock;
-		}
+	/*
+	 * As with the above, all resources are free'd explicitly via
+	 * coresight_device_release() triggered from put_device(), which is in
+	 * turn called from function device_unregister().
+	 */
+	if (ret && ret != -EOPNOTSUPP) {
+		device_unregister(&csdev->dev);
+		goto out_unlock;
 	}
 	/* Device is now registered */
 	registered = true;
diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c
index 3c8a6f795094bc1da9d8b1d0fda8d58640c87489..3b2a62521396dda819011d336982e960a5bd3d0e 100644
--- a/drivers/hwtracing/coresight/coresight-etm-perf.c
+++ b/drivers/hwtracing/coresight/coresight-etm-perf.c
@@ -902,7 +902,10 @@ int etm_perf_add_symlink_sink(struct coresight_device *csdev)
 
 	if (csdev->type != CORESIGHT_DEV_TYPE_SINK &&
 	    csdev->type != CORESIGHT_DEV_TYPE_LINKSINK)
-		return -EINVAL;
+		return -EOPNOTSUPP;
+
+	if (!sink_ops(csdev)->alloc_buffer)
+		return -EOPNOTSUPP;
 
 	if (csdev->ea != NULL)
 		return -EINVAL;

-- 
2.34.1