linux-kernel - [PATCH v2 3/3] coresight: core: Disable helpers for devices that fail to enable

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Message-ID: <20250402011832.2970072-4-yabinc@google.com>
Date: Tue,  1 Apr 2025 18:18:32 -0700
From: Yabin Cui <yabinc@...gle.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>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, Yabin Cui <yabinc@...gle.com>
Subject: [PATCH v2 3/3] coresight: core: Disable helpers for devices that fail
 to enable

When enabling a SINK or LINK type coresight device fails, the
associated helpers should be disabled.

Signed-off-by: Yabin Cui <yabinc@...gle.com>
Suggested-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 drivers/hwtracing/coresight/coresight-core.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index fb43ef6a3b1f..e3270d9b46c9 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -465,7 +465,7 @@ int coresight_enable_path(struct coresight_path *path, enum cs_mode mode,
 		/* Enable all helpers adjacent to the path first */
 		ret = coresight_enable_helpers(csdev, mode, path);
 		if (ret)
-			goto err;
+			goto err_helper;
 		/*
 		 * ETF devices are tricky... They can be a link or a sink,
 		 * depending on how they are configured.  If an ETF has been
@@ -480,14 +480,8 @@ int coresight_enable_path(struct coresight_path *path, enum cs_mode mode,
 		switch (type) {
 		case CORESIGHT_DEV_TYPE_SINK:
 			ret = coresight_enable_sink(csdev, mode, sink_data);
-			/*
-			 * Sink is the first component turned on. If we
-			 * failed to enable the sink, there are no components
-			 * that need disabling. Disabling the path here
-			 * would mean we could disrupt an existing session.
-			 */
 			if (ret)
-				goto out;
+				goto err;
 			break;
 		case CORESIGHT_DEV_TYPE_SOURCE:
 			/* sources are enabled from either sysFS or Perf */
@@ -507,6 +501,8 @@ int coresight_enable_path(struct coresight_path *path, enum cs_mode mode,
 out:
 	return ret;
 err:
+	coresight_disable_helpers(csdev);
+err_helper:
 	coresight_disable_path_from(path, nd);
 	goto out;
 }
-- 
2.49.0.472.ge94155a9ec-goog