[PATCH 4/4] cxl/mbox: Use new return_code handling

[Davidlohr Bueso <dave@stgolabs.net>]

Use the global cxl_mbox_cmd_rc table to improve debug messaging
in __cxl_pci_mbox_send_cmd() and allow cxl_mbox_send_cmd()
to map to proper kernel style errno codes - this patch
continues to use -ENXIO only so no change in semantics.

Reviewed by: Adam Manzanares <a.manzanares@samsung.com>
Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
---
 drivers/cxl/core/mbox.c | 3 +--
 drivers/cxl/pci.c       | 3 ++-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c
index 353b3f97c7e6..d7286c256e1c 100644
--- a/drivers/cxl/core/mbox.c
+++ b/drivers/cxl/core/mbox.c
@@ -169,9 +169,8 @@ int cxl_mbox_send_cmd(struct cxl_dev_state *cxlds, u16 opcode, void *in,
 	if (rc)
 		return rc;
 
-	/* TODO: Map return code to proper kernel style errno */
 	if (mbox_cmd.return_code != CXL_MBOX_CMD_RC_SUCCESS)
-		return -ENXIO;
+		return cxl_mbox_cmd_rc2errno(&mbox_cmd);
 
 	/*
 	 * Variable sized commands can't be validated and so it's up to the
diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
index 4fbef05e9082..18d31fafc856 100644
--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -178,7 +178,8 @@ static int __cxl_pci_mbox_send_cmd(struct cxl_dev_state *cxlds,
 		FIELD_GET(CXLDEV_MBOX_STATUS_RET_CODE_MASK, status_reg);
 
 	if (mbox_cmd->return_code != CXL_MBOX_CMD_RC_SUCCESS) {
-		dev_dbg(dev, "Mailbox operation had an error\n");
+		dev_dbg(dev, "Mailbox operation had an error: %s\n",
+			cxl_mbox_cmd_rc2str(mbox_cmd));
 		return 0; /* completed but caller must check return_code */
 	}
 
-- 
2.26.2