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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>
This commit is contained in:
Russell King 2017-04-10 16:28:20 +01:00 committed by David S. Miller
parent 2c26122e2c
commit a51e2c9da4
1 changed files with 6 additions and 0 deletions
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6
drivers/net/ethernet/marvell/mvmdio.c
View File

@ -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,