linux-kernel - [PATCH v11 01/20] cxl/port: Fix release of RCD endpoints

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Date:   Wed, 27 Sep 2023 17:43:20 +0200
From:   Robert Richter <rrichter@....com>
To:     Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        "Davidlohr Bueso" <dave@...olabs.net>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Dave Jiang <dave.jiang@...el.com>
CC:     <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Terry Bowman <terry.bowman@....com>,
        Robert Richter <rrichter@....com>
Subject: [PATCH v11 01/20] cxl/port: Fix release of RCD endpoints

Binding and unbindind RCD endpoints (e.g. mem0 device) caused the
corresponding endpoint not being released. Reason for that is the
wrong port discovered for RCD endpoints. See cxl_mem_probe() for
proper endpoint parent detection. Fix delete_endpoint() respectively.

Signed-off-by: Robert Richter <rrichter@....com>
---
 drivers/cxl/core/port.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index 7ca01a834e18..d4572a02989a 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -1222,12 +1222,17 @@ static void delete_endpoint(void *data)
 	struct cxl_memdev *cxlmd = data;
 	struct cxl_port *endpoint = cxlmd->endpoint;
 	struct cxl_port *parent_port;
+	struct cxl_dport *dport;
 	struct device *parent;
 
-	parent_port = cxl_mem_find_port(cxlmd, NULL);
+	parent_port = cxl_mem_find_port(cxlmd, &dport);
 	if (!parent_port)
 		goto out;
-	parent = &parent_port->dev;
+
+	if (dport->rch)
+		parent = parent_port->uport_dev;
+	else
+		parent = &parent_port->dev;
 
 	device_lock(parent);
 	if (parent->driver && !endpoint->dead) {
-- 
2.30.2