net: mvmdio: Check for a valid interrupt instead of an error

The following commit:

commit 9ec36cafe43bf835f8f29273597a5b0cbc8267ef
Author: Rob Herring <robh@kernel.org>
Date:   Wed Apr 23 17:57:41 2014 -0500

    of/irq: do irq resolution in platform_get_irq

changed platform_get_irq() which now returns EINVAL and EPROBE_DEFER,
in addition to ENXIO. If there's no interrupt for mvmdio, platform_get_irq()
returns EINVAL, but we currently check only for ENXIO.

Fix this by looking for a positive integer, which is the proper way of
validating a virtual interrupt number.

While at it, add a proper handling for the deferral probe case.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Reviewed-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/net/ethernet/marvell/mvmdio.c b/drivers/net/ethernet/marvell/mvmdio.c
index b161a525fc5b..9d5ced263a5e 100644
--- a/drivers/net/ethernet/marvell/mvmdio.c
+++ b/drivers/net/ethernet/marvell/mvmdio.c
@@ -232,7 +232,7 @@ 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 != -ENXIO) {
+        if (dev->err_interrupt > 0) {
                 ret = devm_request_irq(&pdev->dev, dev->err_interrupt,
                                         orion_mdio_err_irq,
                                         IRQF_SHARED, pdev->name, dev);
@@ -241,6 +241,9 @@ static int orion_mdio_probe(struct platform_device *pdev)
 
                 writel(MVMDIO_ERR_INT_SMI_DONE,
                         dev->regs + MVMDIO_ERR_INT_MASK);
+
+        } else if (dev->err_interrupt == -EPROBE_DEFER) {
+                return -EPROBE_DEFER;
         }
 
         mutex_init(&dev->lock);