net: ethernet: ec_bhf: Fix dma_free_coherent() dma handle

[ Upstream commit ffe68c3 ]

dma_free_coherent() in error path takes priv->rx_buf.alloc_len as
the dma handle. This would lead to improper unmapping of the buffer.

Change the dma handle to priv->rx_buf.alloc_phys.

Fixes: 6af55ff ("Driver for Beckhoff CX5020 EtherCAT master module.")
Cc: <stable@vger.kernel.org>
Signed-off-by: Thomas Fourier <fourier.thomas@gmail.com>
Link: https://patch.msgid.link/20260213164340.77272-2-fourier.thomas@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: Thomas-fourier

drivers/net/ethernet/ec_bhf.c

@@ -423,7 +423,7 @@ static int ec_bhf_open(struct net_device *net_dev)
 
 error_rx_free:
 	dma_free_coherent(dev, priv->rx_buf.alloc_len, priv->rx_buf.alloc,
-			  priv->rx_buf.alloc_len);
+			  priv->rx_buf.alloc_phys);
 out:
 	return err;
 }