net: stmmac: Handle different error codes from platform_get_irq_byname

The following patch moved device tree interrupt resolution into
platform_get_irq_byname:

  ad69674 of/irq: do irq resolution in platform_get_irq_byname()

As a result, the function no longer only return -ENXIO on error.
This breaks DT based probing of stmmac, as seen in test runs of
linux-next next-20140526 cubie2-sunxi_defconfig:

  http://lists.linaro.org/pipermail/kernel-build-reports/2014-May/003659.html

This patch makes the stmmac_platform probe function properly handle
error codes, such as returning for deferred probing, and other codes
returned by of_irq_get_by_name.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 110ca1c766d6..057a1208e594 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1753,7 +1753,7 @@ static int stmmac_open(struct net_device *dev)
         }
 
         /* Request the IRQ lines */
-        if (priv->lpi_irq != -ENXIO) {
+        if (priv->lpi_irq > 0) {
                 ret = request_irq(priv->lpi_irq, stmmac_interrupt, IRQF_SHARED,
                                   dev->name, dev);
                 if (unlikely(ret < 0)) {
@@ -1813,7 +1813,7 @@ static int stmmac_release(struct net_device *dev)
         free_irq(dev->irq, dev);
         if (priv->wol_irq != dev->irq)
                 free_irq(priv->wol_irq, dev);
-        if (priv->lpi_irq != -ENXIO)
+        if (priv->lpi_irq > 0)
                 free_irq(priv->lpi_irq, dev);
 
         /* Stop TX/RX DMA and clear the descriptors */