[PATCH v24 08/11] cxl: Export function for unwinding cxl by accelerators

alejandro.lucero-palau
2026-03-23T11:32:15Z

From: Alejandro Lucero <alucerop@amd.com>

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

Signed-off-by: Alejandro Lucero <alucerop@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.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 9c3ba911d865..8bb53a095290 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -2468,9 +2468,8 @@ 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;

@@ -2489,6 +2488,14 @@ 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;

@@ -2642,7 +2649,7 @@ 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);

@@ -2797,7 +2804,7 @@ 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;
@@ -3963,7 +3970,7 @@ static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd,

rc = __construct_region(cxlr, ctx);
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 122b3331469d..b8cdc604480a 100644
--- a/include/cxl/cxl.h
+++ b/include/cxl/cxl.h
@@ -236,4 +236,5 @@ 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