netdev - [PATCH net 2/5] ibmvnic: Unmap DMA login rsp buffer on send login fail

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Date: Thu,  3 Aug 2023 15:20:07 -0500
From: Nick Child <nnac123@...ux.ibm.com>
To: netdev@...r.kernel.org
Cc: haren@...ux.ibm.com, ricklind@...ibm.com, danymadden@...ibm.com,
        tlfalcon@...ux.ibm.com, bjking1@...ux.ibm.com,
        Nick Child <nnac123@...ux.ibm.com>
Subject: [PATCH net 2/5] ibmvnic: Unmap DMA login rsp buffer on send login fail

If the LOGIN CRQ fails to send then we must DMA unmap the response
buffer. Previously, if the CRQ failed then the memory was freed without
DMA unmapping.

Fixes: c98d9cc4170d ("ibmvnic: send_login should check for crq errors")
Signed-off-by: Nick Child <nnac123@...ux.ibm.com>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 996f8037c266..fdc0bac029ad 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -4830,11 +4830,14 @@ static int send_login(struct ibmvnic_adapter *adapter)
 	if (rc) {
 		adapter->login_pending = false;
 		netdev_err(adapter->netdev, "Failed to send login, rc=%d\n", rc);
-		goto buf_rsp_map_failed;
+		goto buf_send_failed;
 	}
 
 	return 0;
 
+buf_send_failed:
+	dma_unmap_single(dev, rsp_buffer_token, rsp_buffer_size,
+			 DMA_FROM_DEVICE);
 buf_rsp_map_failed:
 	kfree(login_rsp_buffer);
 	adapter->login_rsp_buf = NULL;
-- 
2.39.3