[PATCH] NTB: epf: propagate memory window command errors

[Avi Weiss <thnkslprpt@gmail.com>]

ntb_epf_mw_set_trans() and ntb_epf_mw_clear_trans() discard the result
of ntb_epf_send_command() and return success even when the endpoint
reports a command failure or fails to respond. This prevents NTB
clients from detecting a failed memory window operation.

Return the command status from both callbacks. Preserve the existing
teardown error diagnostic.

Fixes: 812ce2f8d14e ("NTB: Add support for EPF PCI Non-Transparent Bridge")
Signed-off-by: Avi Weiss <thnkslprpt@gmail.com>
---
 drivers/ntb/hw/epf/ntb_hw_epf.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/ntb/hw/epf/ntb_hw_epf.c b/drivers/ntb/hw/epf/ntb_hw_epf.c
index c47607d4f8a7f..dd10c30bdbec4 100644
--- a/drivers/ntb/hw/epf/ntb_hw_epf.c
+++ b/drivers/ntb/hw/epf/ntb_hw_epf.c
@@ -498,18 +498,16 @@ static int ntb_epf_mw_set_trans(struct ntb_dev *ntb, int pidx, int idx,
 	writel(upper_32_bits(addr), ndev->ctrl_reg + NTB_EPF_UPPER_ADDR);
 	writel(lower_32_bits(size), ndev->ctrl_reg + NTB_EPF_LOWER_SIZE);
 	writel(upper_32_bits(size), ndev->ctrl_reg + NTB_EPF_UPPER_SIZE);
-	ntb_epf_send_command(ndev, CMD_CONFIGURE_MW, idx);
-
-	return 0;
+	return ntb_epf_send_command(ndev, CMD_CONFIGURE_MW, idx);
 }
 
 static int ntb_epf_mw_clear_trans(struct ntb_dev *ntb, int pidx, int idx)
 {
 	struct ntb_epf_dev *ndev = ntb_ndev(ntb);
 	struct device *dev = ndev->dev;
-	int ret = 0;
+	int ret;
 
-	ntb_epf_send_command(ndev, CMD_TEARDOWN_MW, idx);
+	ret = ntb_epf_send_command(ndev, CMD_TEARDOWN_MW, idx);
 	if (ret)
 		dev_err(dev, "Failed to teardown memory window\n");
 

base-commit: d135ab453a7400a34930bdda1ef4bdc8acfac80e
-- 
2.43.0