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net: mvmdio: defer probe of orion-mdio if a clock is not ready 

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>
This commit is contained in:
Josua Mayer 2019-07-09 15:01:01 +02:00 committed by David S. Miller
parent ea664b1bdc
commit 433a06d7d7
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/marvell/mvmdio.c
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@ -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]);
@ -366,6 +370,7 @@ out_mdio:
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;