netdev - [PATCH] net: thunder: Check for driver data in nicvf

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Date:	Mon, 16 Nov 2015 17:51:34 +0300
From:	Pavel Fedin <p.fedin@...sung.com>
To:	netdev@...r.kernel.org
Cc:	Sunil Goutham <sgoutham@...ium.com>,
	Robert Richter <rric@...nel.org>, youngmin.lee@...ium.com,
	kin-yip.liu@...ium.com
Subject: [PATCH] net: thunder: Check for driver data in nicvf_remove()

In some cases the crash is caused by nicvf_remove() being called from
outside. For example, if we try to feed the device to vfio after the
probe has failed for some reason. So, move the check to better place.

Signed-off-by: Pavel Fedin <p.fedin@...sung.com>
---
 drivers/net/ethernet/cavium/thunder/nicvf_main.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
index 372c39e..7f709cb 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
@@ -1583,8 +1583,14 @@ err_disable_device:
 static void nicvf_remove(struct pci_dev *pdev)
 {
 	struct net_device *netdev = pci_get_drvdata(pdev);
-	struct nicvf *nic = netdev_priv(netdev);
-	struct net_device *pnetdev = nic->pnicvf->netdev;
+	struct nicvf *nic;
+	struct net_device *pnetdev;
+
+	if (!netdev)
+		return;
+
+	nic = netdev_priv(netdev);
+	pnetdev = nic->pnicvf->netdev;
 
 	/* Check if this Qset is assigned to different VF.
 	 * If yes, clean primary and all secondary Qsets.
@@ -1600,9 +1606,6 @@ static void nicvf_remove(struct pci_dev *pdev)
 
 static void nicvf_shutdown(struct pci_dev *pdev)
 {
-	if (!pci_get_drvdata(pdev))
-		return;
-
 	nicvf_remove(pdev);
 }
 
-- 
2.4.4

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