netdev - [PATCH net] r8169: fix crash if CONFIG_DEBUG

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Date:   Sun, 9 Dec 2018 22:05:11 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net] r8169: fix crash if CONFIG_DEBUG_SHIRQ is enabled

If CONFIG_DEBUG_SHIRQ is enabled __free_irq() intentionally fires
a spurious interrupt. This interrupt causes a crash because
tp->dev->phydev is NULL at that time.

Fixes: 38caff5a445b ("r8169: handle all interrupt events in the hard irq handler")
Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/ethernet/realtek/r8169.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index bb1847fd6..8462553e3 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -6414,7 +6414,7 @@ static irqreturn_t rtl8169_interrupt(int irq, void *dev_instance)
 		goto out;
 	}
 
-	if (status & LinkChg)
+	if (status & LinkChg && tp->dev->phydev)
 		phy_mac_interrupt(tp->dev->phydev);
 
 	if (unlikely(status & RxFIFOOver &&
-- 
2.19.2