[RFC 01/13] cxl: allow a type-2 device not to have memory device registers

[Zhi Wang <zhiw@nvidia.com>]

CXL memory device registers provide additional information about device
memory and advanced control interface for type-3 device.

However, it is not mandatory for a type-2 device. A type-2 device can
have HDMs but not CXL memory device registers.

Allow a type-2 device not to hanve memory device register when probing
CXL registers.

Signed-off-by: Zhi Wang <zhiw@nvidia.com>
---
 drivers/cxl/pci.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
index e00ce7f4d0f9..3fbee31995f1 100644
--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -529,13 +529,13 @@ int cxl_pci_accel_setup_regs(struct pci_dev *pdev, struct cxl_dev_state *cxlds)
 	int rc;
 
 	rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_MEMDEV, &map,
-				cxlds->capabilities);
-	if (rc)
-		return rc;
-
-	rc = cxl_map_device_regs(&map, &cxlds->regs.device_regs);
-	if (rc)
-		return rc;
+			cxlds->capabilities);
+	if (!rc) {
+		rc = cxl_map_device_regs(&map, &cxlds->regs.device_regs);
+		if (rc)
+			dev_dbg(&pdev->dev,
+				"Failed to map device registers.\n");
+	}
 
 	rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_COMPONENT,
 				&cxlds->reg_map, cxlds->capabilities);
-- 
2.34.1