cxl/mem: Clarify @host for devm_cxl_add_nvdimm()

The convention for devm_ helpers in the CXL driver is that the first
argument is the @host for the operation (locked driver::probe() context).

Reviewed-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20260114182055.46029-17-terry.bowman@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

Author: djbw

drivers/cxl/core/pmem.c

@@ -237,20 +237,21 @@ static void cxlmd_release_nvdimm(void *_cxlmd)
 
 /**
  * devm_cxl_add_nvdimm() - add a bridge between a cxl_memdev and an nvdimm
- * @parent_port: parent port for the (to be added) @cxlmd endpoint port
- * @cxlmd: cxl_memdev instance that will perform LIBNVDIMM operations
+ * @host: host device for devm operations
+ * @port: any port in the CXL topology to find the nvdimm-bridge device
+ * @cxlmd: parent of the to be created cxl_nvdimm device
  *
  * Return: 0 on success negative error code on failure.
  */
-int devm_cxl_add_nvdimm(struct cxl_port *parent_port,
+int devm_cxl_add_nvdimm(struct device *host, struct cxl_port *port,
 			struct cxl_memdev *cxlmd)
 {
 	struct cxl_nvdimm_bridge *cxl_nvb;
 	struct cxl_nvdimm *cxl_nvd;
 	struct device *dev;
 	int rc;
 
-	cxl_nvb = cxl_find_nvdimm_bridge(parent_port);
+	cxl_nvb = cxl_find_nvdimm_bridge(port);
 	if (!cxl_nvb)
 		return -ENODEV;
 
@@ -270,10 +271,10 @@ int devm_cxl_add_nvdimm(struct cxl_port *parent_port,
 	if (rc)
 		goto err;
 
-	dev_dbg(&cxlmd->dev, "register %s\n", dev_name(dev));
+	dev_dbg(host, "register %s\n", dev_name(dev));
 
 	/* @cxlmd carries a reference on @cxl_nvb until cxlmd_release_nvdimm */
-	return devm_add_action_or_reset(&cxlmd->dev, cxlmd_release_nvdimm, cxlmd);
+	return devm_add_action_or_reset(host, cxlmd_release_nvdimm, cxlmd);
 
 err:
 	put_device(dev);

drivers/cxl/cxl.h

@@ -887,7 +887,8 @@ struct cxl_nvdimm_bridge *devm_cxl_add_nvdimm_bridge(struct device *host,
 						     struct cxl_port *port);
 struct cxl_nvdimm *to_cxl_nvdimm(struct device *dev);
 bool is_cxl_nvdimm(struct device *dev);
-int devm_cxl_add_nvdimm(struct cxl_port *parent_port, struct cxl_memdev *cxlmd);
+int devm_cxl_add_nvdimm(struct device *host, struct cxl_port *port,
+			struct cxl_memdev *cxlmd);
 struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct cxl_port *port);
 
 #ifdef CONFIG_CXL_REGION

drivers/cxl/mem.c

@@ -153,7 +153,7 @@ static int cxl_mem_probe(struct device *dev)
 	}
 
 	if (cxl_pmem_size(cxlds) && IS_ENABLED(CONFIG_CXL_PMEM)) {
-		rc = devm_cxl_add_nvdimm(parent_port, cxlmd);
+		rc = devm_cxl_add_nvdimm(dev, parent_port, cxlmd);
 		if (rc) {
 			if (rc == -ENODEV)
 				dev_info(dev, "PMEM disabled by platform\n");