netdev - [PATCH 2/2] ixgbe: add missing rtnl

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Date:	Thu,  5 Apr 2012 11:11:04 -0400
From:	Benjamin Poirier <bpoirier@...e.de>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Cc:	Alex Duyck <alexander.h.duyck@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	Carolyn Wyborny <carolyn.wyborny@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	e1000-devel@...ts.sourceforge.net,
	Emil Tantilov <emil.s.tantilov@...el.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Greg Rose <gregory.v.rose@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Subject: [PATCH 2/2] ixgbe: add missing rtnl_lock in PM resume path

Upon resume from standby, ixgbe may trigger the ASSERT_RTNL() in
netif_set_real_num_tx_queues(). The call stack is:
	netif_set_real_num_tx_queues
	ixgbe_set_num_queues
	ixgbe_init_interrupt_scheme
	ixgbe_resume

Signed-off-by: Benjamin Poirier <bpoirier@...e.de>

---
Unlike patch 1 for igb, we cannot lock rtnl closer to the point where
netif_set_real_num_tx_queues() is called because ixgbe_init_interrupt_scheme()
is also called by the dcb code, already under rtnl.
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 3e26b1f..ff6edab 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -4836,7 +4836,9 @@ static int ixgbe_resume(struct pci_dev *pdev)
 
 	pci_wake_from_d3(pdev, false);
 
+	rtnl_lock();
 	err = ixgbe_init_interrupt_scheme(adapter);
+	rtnl_unlock();
 	if (err) {
 		e_dev_err("Cannot initialize interrupts for device\n");
 		return err;
-- 
1.7.7

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