netdev - [PATCH net v2 2/5] ibmvnic: Unmap DMA login rsp buffer on send login fail

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Date: Wed,  9 Aug 2023 17:10:35 -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>, Simon Horman <horms@...nel.org>
Subject: [PATCH net v2 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>
Reviewed-by: Simon Horman <horms@...nel.org>
---
 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 f4bb2c9ab9a4..668c67556190 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