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

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Message-Id: <E1cxbEq-0006gR-Dy@rmk-PC.armlinux.org.uk>
Date:   Mon, 10 Apr 2017 16:28:20 +0100
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     Marcin Wojtas <mw@...ihalf.com>,
        Stefan Chulski <stefanc@...vell.com>,
        Andrew Lunn <andrew@...n.ch>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:     netdev@...r.kernel.org
Subject: [PATCH 4/6] 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@...linux.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