netdev - [PATCH v23 10/22] cxl: Export function for unwinding cxl by accelerators

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Message-ID: <20260201155438.2664640-11-alejandro.lucero-palau@amd.com>
Date: Sun, 1 Feb 2026 15:54:26 +0000
From: <alejandro.lucero-palau@....com>
To: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <edward.cree@....com>, <davem@...emloft.net>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <edumazet@...gle.com>,
	<dave.jiang@...el.com>
CC: Alejandro Lucero <alucerop@....com>
Subject: [PATCH v23 10/22] cxl: Export function for unwinding cxl by accelerators

From: Alejandro Lucero <alucerop@....com>

Add cxl_unregister_region() to the accelerator driver API
for a clean exit.

Signed-off-by: Alejandro Lucero <alucerop@....com>
---
 drivers/cxl/core/region.c | 17 ++++++++++++-----
 include/cxl/cxl.h         |  1 +
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index acf29ba3b205..954b8fcdbac6 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -2438,9 +2438,8 @@ static struct cxl_region *to_cxl_region(struct device *dev)
 	return container_of(dev, struct cxl_region, dev);
 }
 
-static void unregister_region(void *_cxlr)
+void cxl_unregister_region(struct cxl_region *cxlr)
 {
-	struct cxl_region *cxlr = _cxlr;
 	struct cxl_region_params *p = &cxlr->params;
 	int i;
 
@@ -2457,6 +2456,14 @@ static void unregister_region(void *_cxlr)
 	cxl_region_iomem_release(cxlr);
 	put_device(&cxlr->dev);
 }
+EXPORT_SYMBOL_NS_GPL(cxl_unregister_region, "CXL");
+
+static void __unregister_region(void *_cxlr)
+{
+	struct cxl_region *cxlr = _cxlr;
+
+	return cxl_unregister_region(cxlr);
+}
 
 static struct lock_class_key cxl_region_key;
 
@@ -2608,7 +2615,7 @@ static struct cxl_region *devm_cxl_add_region(struct cxl_root_decoder *cxlrd,
 	if (rc)
 		goto err;
 
-	rc = devm_add_action_or_reset(port->uport_dev, unregister_region, cxlr);
+	rc = devm_add_action_or_reset(port->uport_dev, __unregister_region, cxlr);
 	if (rc)
 		return ERR_PTR(rc);
 
@@ -2762,7 +2769,7 @@ static ssize_t delete_region_store(struct device *dev,
 	if (IS_ERR(cxlr))
 		return PTR_ERR(cxlr);
 
-	devm_release_action(port->uport_dev, unregister_region, cxlr);
+	devm_release_action(port->uport_dev, __unregister_region, cxlr);
 	put_device(&cxlr->dev);
 
 	return len;
@@ -3878,7 +3885,7 @@ static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd,
 
 	rc = __construct_region(cxlr, cxlrd, cxled);
 	if (rc) {
-		devm_release_action(port->uport_dev, unregister_region, cxlr);
+		devm_release_action(port->uport_dev, __unregister_region, cxlr);
 		return ERR_PTR(rc);
 	}
 
diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h
index 906065e0d2a6..92880c26b2d5 100644
--- a/include/cxl/cxl.h
+++ b/include/cxl/cxl.h
@@ -254,4 +254,5 @@ struct cxl_endpoint_decoder *cxl_get_committed_decoder(struct cxl_memdev *cxlmd,
 						       struct cxl_region **cxlr);
 struct range;
 int cxl_get_region_range(struct cxl_region *region, struct range *range);
+void cxl_unregister_region(struct cxl_region *cxlr);
 #endif /* __CXL_CXL_H__ */
-- 
2.34.1