[PATCH net 02/10] net: ethernet: mediatek: fix incorrect return value of devm_clk_get with EPROBE_DEFER

[Sean@vger.kernel.org, Wang@vger.kernel.org]

From: Sean Wang <sean.wang@mediatek.com>

If the return value of devm_clk_get is EPROBE_DEFER, we should
defer probing the driver. The change is verified and works based
on 4.8-rc1 staying with the latest clk-next code for MT7623.

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 6e4a6ca..02b048f 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1851,8 +1851,15 @@ static int mtk_probe(struct platform_device *pdev)
 	eth->clk_gp1 = devm_clk_get(&pdev->dev, "gp1");
 	eth->clk_gp2 = devm_clk_get(&pdev->dev, "gp2");
 	if (IS_ERR(eth->clk_esw) || IS_ERR(eth->clk_gp1) ||
-	    IS_ERR(eth->clk_gp2) || IS_ERR(eth->clk_ethif))
-		return -ENODEV;
+	    IS_ERR(eth->clk_gp2) || IS_ERR(eth->clk_ethif)) {
+		if (PTR_ERR(eth->clk_esw) == -EPROBE_DEFER ||
+		    PTR_ERR(eth->clk_gp1) == -EPROBE_DEFER ||
+		    PTR_ERR(eth->clk_gp1) == -EPROBE_DEFER ||
+		    PTR_ERR(eth->clk_gp2) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+		else
+			return -ENODEV;
+	}
 
 	clk_prepare_enable(eth->clk_ethif);
 	clk_prepare_enable(eth->clk_esw);
-- 
1.9.1