netdev - [PATCH] netxen: check for root bus in netxen_mask_aer

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Date:	Fri, 14 Sep 2012 17:50:03 +0200
From:	nikolay@...hat.com
To:	sony.chacko@...gic.com
Cc:	rajesh.borundia@...gic.com, netdev@...r.kernel.org
Subject: [PATCH] netxen: check for root bus in netxen_mask_aer_correctable

From: Nikolay Aleksandrov <nikolay@...hat.com>

Add a check if pdev->bus->self == NULL (root bus). When attaching
a netxen NIC to a VM it can be on the root bus and the guest would
crash in netxen_mask_aer_correctable() because of a NULL pointer
dereference if CONFIG_PCIEAER is present.

Signed-off-by: Nikolay Aleksandrov <nikolay@...hat.com>
---
 drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c b/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
index 342b3a7..e2a4858 100644
--- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
+++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
@@ -1378,6 +1378,10 @@ static void netxen_mask_aer_correctable(struct netxen_adapter *adapter)
 	struct pci_dev *root = pdev->bus->self;
 	u32 aer_pos;
 
+	/* root bus? */
+	if (!root)
+		return;
+
 	if (adapter->ahw.board_type != NETXEN_BRDTYPE_P3_4_GB_MM &&
 		adapter->ahw.board_type != NETXEN_BRDTYPE_P3_10G_TP)
 		return;
-- 
1.7.11.4

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