[PATCH v4] drivers: net: smc911x: Check for error irq

As platform_get_irq() could fail and return error irq number.
And the error irq will finally cause the failure of the request_irq().
Consider that platform_get_irq() can now in certain cases return
-EPROBE_DEFER, and the consequences of letting request_irq() effectively
convert that into -EINVAL, even at probe time rather than later on.
So it might be better to check just now.

Fixes: ae150435b59e ("smsc: Move the SMC (SMSC) drivers")
Signed-off-by: Jiasheng Jiang <redacted>
---
Changlog:

v3 -> v4

*Change 1. Using error varaible to check.
*Change 2. Fix commit message.
*Change 3. Refine commit message.
---
 drivers/net/ethernet/smsc/smc911x.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/smsc/smc911x.c b/drivers/net/ethernet/smsc/smc911x.c
index 22cdbf12c823..9470d9c07fed 100644
--- a/drivers/net/ethernet/smsc/smc911x.c
+++ b/drivers/net/ethernet/smsc/smc911x.c

@@ -2069,7 +2069,12 @@ static int smc911x_drv_probe(struct platform_device *pdev)
 	SET_NETDEV_DEV(ndev, &pdev->dev);
 
 	ndev->dma = (unsigned char)-1;
-	ndev->irq = platform_get_irq(pdev, 0);
+
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		goto release_both;
+	ndev->irq = ret;
+
 	lp = netdev_priv(ndev);
 	lp->netdev = ndev;
 #ifdef SMC_DYNAMIC_BUS_CONFIG

-- 
2.25.1