[PATCH v4 12/14] cxl/region: Add a dev_err() on missing target list entries

[Robert Richter]

Broken target lists are hard to discover as the driver fails at a
later initialization stage. Add an error message for this.

Example log messages:

  cxl_mem mem1: failed to find endpoint6:0000:e0:01.3 in target list of decoder1.1
  cxl_port endpoint6: failed to register decoder6.0: -6
  cxl_port endpoint6: probe: 0

Signed-off-by: Robert Richter <rrichter@xxxxxxx>
Reviewed-by: Gregory Price <gourry@xxxxxxxxxx>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>
Tested-by: Gregory Price <gourry@xxxxxxxxxx>
---
 drivers/cxl/core/region.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index bd1ce9d8bed7..175f5f600c5d 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -1805,6 +1805,13 @@ static int find_pos_and_ways(struct cxl_port *port, struct range *range,
 	}
 	put_device(dev);
 
+	if (rc)
+		dev_err(port->uport_dev,
+			"failed to find %s:%s in target list of %s\n",
+			dev_name(&port->dev),
+			dev_name(port->parent_dport->dport_dev),
+			dev_name(&cxlsd->cxld.dev));
+
 	return rc;
 }
 
-- 
2.39.5