From a51e2c9da44acad7494ac3f57c48f296890cbe2a Mon Sep 17 00:00:00 2001 From: Russell King Date: Mon, 10 Apr 2017 16:28:20 +0100 Subject: net: mvmdio: disable interrupt if resource size is too small Disable the MDIO interrupt, falling back to polled mode, if the resource size does not allow us to access the interrupt registers. All current DT bindings use a size of 0x84, which allows access, but verifying it is good practice. Signed-off-by: Russell King Reviewed-by: Andrew Lunn Signed-off-by: David S. Miller --- drivers/net/ethernet/marvell/mvmdio.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/net/ethernet/marvell') diff --git a/drivers/net/ethernet/marvell/mvmdio.c b/drivers/net/ethernet/marvell/mvmdio.c index 6ea5caddca62..614dfde657fe 100644 --- a/drivers/net/ethernet/marvell/mvmdio.c +++ b/drivers/net/ethernet/marvell/mvmdio.c @@ -221,6 +221,12 @@ static int orion_mdio_probe(struct platform_device *pdev) clk_prepare_enable(dev->clk); dev->err_interrupt = platform_get_irq(pdev, 0); + if (dev->err_interrupt > 0 && + resource_size(r) < MVMDIO_ERR_INT_MASK + 4) { + dev_err(&pdev->dev, + "disabling interrupt, resource size is too small\n"); + dev->err_interrupt = 0; + } if (dev->err_interrupt > 0) { ret = devm_request_irq(&pdev->dev, dev->err_interrupt, orion_mdio_err_irq, -- cgit v1.2.3