[PATCH AUTOSEL 5.1 219/219] net: mvmdio: defer probe of orion-mdio if a clock is not ready

Sasha Levin
2019-07-15T14:17:56Z

From: Josua Mayer <josua@solid-run.com>

[ Upstream commit 433a06d7d74e677c40b1148c70c48677ff62fb6b ]

Defer probing of the orion-mdio interface when getting a clock returns
EPROBE_DEFER. This avoids locking up the Armada 8k SoC when mdio is used
before all clocks have been enabled.

Signed-off-by: Josua Mayer <josua@solid-run.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/marvell/mvmdio.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/marvell/mvmdio.c b/drivers/net/ethernet/marvell/mvmdio.c
index c5dac6bd2be4..903836e334d8 100644
--- a/drivers/net/ethernet/marvell/mvmdio.c
+++ b/drivers/net/ethernet/marvell/mvmdio.c
@@ -321,6 +321,10 @@ static int orion_mdio_probe(struct platform_device *pdev)

for (i = 0; i < ARRAY_SIZE(dev->clk); i++) {
dev->clk[i] = of_clk_get(pdev->dev.of_node, i);
+ if (PTR_ERR(dev->clk[i]) == -EPROBE_DEFER) {
+ ret = -EPROBE_DEFER;
+ goto out_clk;
+ }
if (IS_ERR(dev->clk[i]))
break;
clk_prepare_enable(dev->clk[i]);
@@ -362,6 +366,7 @@ static int orion_mdio_probe(struct platform_device *pdev)
if (dev->err_interrupt > 0)
writel(0, dev->regs + MVMDIO_ERR_INT_MASK);

+out_clk:
for (i = 0; i < ARRAY_SIZE(dev->clk); i++) {
if (IS_ERR(dev->clk[i]))
break;
--
2.20.1