[PATCH net 2/3] net: stmmac: free RX resources when TX allocation fails

[Karl Mehltretter <kmehltretter@gmail.com>]

alloc_dma_desc_resources() allocates every RX queue before allocating
TX queues. If TX allocation fails, its error path only frees TX
resources and leaks all RX resources.

Free the RX resources after the TX allocator unwinds its queues.

Found by inspection. On a BeagleV Ahead (TH1520), forcing TX DMA
metadata allocation to fail left the RX cleanup event absent. With this
change, both TX and RX resources were released.

Fixes: 71fedb0198cb ("net: stmmac: break some functions into RX and TX scopes")
Assisted-by: LLM
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 495ff7aef..8fd7d2173 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2425,6 +2425,8 @@ static int alloc_dma_desc_resources(struct stmmac_priv *priv,
 		return ret;
 
 	ret = alloc_dma_tx_desc_resources(priv, dma_conf);
+	if (ret)
+		free_dma_rx_desc_resources(priv, dma_conf);
 
 	return ret;
 }
-- 
2.39.5 (Apple Git-154)