[PATCH 4/6] net: mvmdio: disable interrupt if resource size is too small

[Russell King]

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 <rmk+ker...@armlinux.org.uk>
---
 drivers/net/ethernet/marvell/mvmdio.c | 6 ++++++
 1 file changed, 6 insertions(+)

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,
-- 
2.7.4