linux-kernel - [PATCH v1 4/7] cxl/core: Use guard() to drop the goto pattern of cxl_dpa

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Message-Id: <20250211075727.351895-5-ming.li@zohomail.com>
Date: Tue, 11 Feb 2025 15:57:24 +0800
From: Li Ming <ming.li@...omail.com>
To: dave@...olabs.net,
	jonathan.cameron@...wei.com,
	dave.jiang@...el.com,
	alison.schofield@...el.com,
	vishal.l.verma@...el.com,
	ira.weiny@...el.com,
	dan.j.williams@...el.com
Cc: linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Li Ming <ming.li@...omail.com>
Subject: [PATCH v1 4/7] cxl/core: Use guard() to drop the goto pattern of cxl_dpa_free()

cxl_dpa_free() has a goto pattern to call up_write() for cxl_dpa_rwsem,
it can be removed by using a guard() to replace the down_write() and
up_write().

Signed-off-by: Li Ming <ming.li@...omail.com>
---
 drivers/cxl/core/hdm.c | 24 ++++++++----------------
 1 file changed, 8 insertions(+), 16 deletions(-)

diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
index 2bb2782a72ad..4d753520a79a 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -384,35 +384,27 @@ int cxl_dpa_free(struct cxl_endpoint_decoder *cxled)
 {
 	struct cxl_port *port = cxled_to_port(cxled);
 	struct device *dev = &cxled->cxld.dev;
-	int rc;
 
-	down_write(&cxl_dpa_rwsem);
-	if (!cxled->dpa_res) {
-		rc = 0;
-		goto out;
-	}
+	guard(rwsem_write)(&cxl_dpa_rwsem);
+	if (!cxled->dpa_res)
+		return 0;
 	if (cxled->cxld.region) {
 		dev_dbg(dev, "decoder assigned to: %s\n",
 			dev_name(&cxled->cxld.region->dev));
-		rc = -EBUSY;
-		goto out;
+		return -EBUSY;
 	}
 	if (cxled->cxld.flags & CXL_DECODER_F_ENABLE) {
 		dev_dbg(dev, "decoder enabled\n");
-		rc = -EBUSY;
-		goto out;
+		return -EBUSY;
 	}
 	if (cxled->cxld.id != port->hdm_end) {
 		dev_dbg(dev, "expected decoder%d.%d\n", port->id,
 			port->hdm_end);
-		rc = -EBUSY;
-		goto out;
+		return -EBUSY;
 	}
+
 	devm_cxl_dpa_release(cxled);
-	rc = 0;
-out:
-	up_write(&cxl_dpa_rwsem);
-	return rc;
+	return 0;
 }
 
 int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled,
-- 
2.34.1