net: ll_temac: fix error checking of irq_of_parse_and_map()

Most kernel functions return negative error codes but some irq functions
return zero on error.  In this code irq_of_parse_and_map(), returns zero
and platform_get_irq() returns negative error codes.  We need to handle
both cases appropriately.

Fixes: 8425c41d1ef7 ("net: ll_temac: Extend support to non-device-tree platforms")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Acked-by: Esben Haabendal <esben@geanix.com>
Reviewed-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Harini Katakam <harini.katakam@amd.com>
Link: https://lore.kernel.org/r/3d0aef75-06e0-45a5-a2a6-2cc4738d4143@moroto.mountain
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
index e0ac1bc..49f3033 100644 (file)
--- a/drivers/net/ethernet/xilinx/ll_temac_main.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -1567,12 +1567,16 @@ static int temac_probe(struct platform_device *pdev)
        }
 
        /* Error handle returned DMA RX and TX interrupts */
-       if (lp->rx_irq < 0)
-               return dev_err_probe(&pdev->dev, lp->rx_irq,
+       if (lp->rx_irq <= 0) {
+               rc = lp->rx_irq ?: -EINVAL;
+               return dev_err_probe(&pdev->dev, rc,
                                     "could not get DMA RX irq\n");
-       if (lp->tx_irq < 0)
-               return dev_err_probe(&pdev->dev, lp->tx_irq,
+       }
+       if (lp->tx_irq <= 0) {
+               rc = lp->tx_irq ?: -EINVAL;
+               return dev_err_probe(&pdev->dev, rc,
                                     "could not get DMA TX irq\n");
+       }
 
        if (temac_np) {
                /* Retrieve the MAC address */