netdev - [PATCH] bcmgenet: add WOL IRQ check

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Date:   Thu, 13 Jan 2022 22:46:07 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Doug Berger <opendmb@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, <netdev@...r.kernel.org>
CC:     <bcm-kernel-feedback-list@...adcom.com>
Subject: [PATCH] bcmgenet: add WOL IRQ check

The driver neglects to check the result of platform_get_irq_optional()'s
call and blithely passes the negative error codes to devm_request_irq()
(which takes *unsigned* IRQ #), causing it to fail with -EINVAL.
Stop calling devm_request_irq() with the invalid IRQ #s.

Signed-off-by: Sergey Shtylyov <s.shtylyov@....ru>

---
This patch is against DaveM's 'net.git' repo.

 drivers/net/ethernet/broadcom/genet/bcmgenet.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

Index: net/drivers/net/ethernet/broadcom/genet/bcmgenet.c
===================================================================
--- net.orig/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ net/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -4020,10 +4020,12 @@ static int bcmgenet_probe(struct platfor
 
 	/* Request the WOL interrupt and advertise suspend if available */
 	priv->wol_irq_disabled = true;
-	err = devm_request_irq(&pdev->dev, priv->wol_irq, bcmgenet_wol_isr, 0,
-			       dev->name, priv);
-	if (!err)
-		device_set_wakeup_capable(&pdev->dev, 1);
+	if (priv->wol_irq > 0) {
+		err = devm_request_irq(&pdev->dev, priv->wol_irq,
+				       bcmgenet_wol_isr, 0, dev->name, priv);
+		if (!err)
+			device_set_wakeup_capable(&pdev->dev, 1);
+	}
 
 	/* Set the needed headroom to account for any possible
 	 * features enabling/disabling at runtime