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 <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/marvell/mvmdio.c b/drivers/net/ethernet/marvell/mvmdio.c
index 6ea5caddca62bb602b1f50c7aa041c40a1ab9e99..614dfde657fe7ff73145cd6e09d5540041c57e7b 100644 (file)
--- 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,