[PATCH net-next 13/14] net: renesas: rswitch: Remove obsolete 32-bit DMA mask fallback

[Ruizhe Zhou <zhouruizhe@resnics.com>]

The DMA API guarantees support for masks of 32 bits or wider and
explicitly identifies retrying a 32-bit mask after a wider request as
incorrect:
https://docs.kernel.org/core-api/dma-api-howto.html#dma-addressing-capabilities

Remove the obsolete fallback while retaining the error check so that a
genuine DMA setup failure still aborts initialization.

Signed-off-by: Ruizhe Zhou <zhouruizhe@resnics.com>
---
 drivers/net/ethernet/renesas/rswitch_main.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/renesas/rswitch_main.c b/drivers/net/ethernet/renesas/rswitch_main.c
index 755232994fcc..64b821ca02f8 100644
--- a/drivers/net/ethernet/renesas/rswitch_main.c
+++ b/drivers/net/ethernet/renesas/rswitch_main.c
@@ -2162,11 +2162,8 @@ static int renesas_eth_sw_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(40));
-	if (ret < 0) {
-		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
-		if (ret < 0)
-			return ret;
-	}
+	if (ret)
+		return ret;
 
 	priv->gwca.index = AGENT_INDEX_GWCA;
 	priv->gwca.num_queues = min(RSWITCH_NUM_PORTS * NUM_QUEUES_PER_NDEV,
-- 
2.27.0