linux-kernel - [PATCH v5 2/2] coresight: core: Disable helpers for devices that fail to enable

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Message-ID: <20250429231301.1952246-3-yabinc@google.com>
Date: Tue, 29 Apr 2025 16:13:00 -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>, Leo Yan <leo.yan@....com>, 
	Jie Gan <quic_jiegan@...cinc.com>, 
	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 v5 2/2] 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>
Reviewed-by: James Clark <james.clark@...aro.org>
Reviewed-by: Mike Leach <mike.leach@...aro.org>
---
 drivers/hwtracing/coresight/coresight-core.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index dabec7073aed..d3523f0262af 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_disable_path;
 		/*
 		 * ETF devices are tricky... They can be a link or a sink,
 		 * depending on how they are configured.  If an ETF has been
@@ -486,8 +486,10 @@ int coresight_enable_path(struct coresight_path *path, enum cs_mode mode,
 			 * that need disabling. Disabling the path here
 			 * would mean we could disrupt an existing session.
 			 */
-			if (ret)
+			if (ret) {
+				coresight_disable_helpers(csdev, path);
 				goto out;
+			}
 			break;
 		case CORESIGHT_DEV_TYPE_SOURCE:
 			/* sources are enabled from either sysFS or Perf */
@@ -497,16 +499,19 @@ int coresight_enable_path(struct coresight_path *path, enum cs_mode mode,
 			child = list_next_entry(nd, link)->csdev;
 			ret = coresight_enable_link(csdev, parent, child, source);
 			if (ret)
-				goto err;
+				goto err_disable_helpers;
 			break;
 		default:
-			goto err;
+			ret = -EINVAL;
+			goto err_disable_helpers;
 		}
 	}
 
 out:
 	return ret;
-err:
+err_disable_helpers:
+	coresight_disable_helpers(csdev, path);
+err_disable_path:
 	coresight_disable_path_from(path, nd);
 	goto out;
 }
-- 
2.49.0.967.g6a0df3ecc3-goog