[Intel-wired-lan] [PATCH v2] ixgbevf: handle race between close and suspend on shutdown

[Singh, Krishneil K]

-----Original Message-----
From: Intel-wired-lan [mailto:intel-wired-lan-bounces at lists.osuosl.org] On Behalf Of Emil Tantilov
Sent: Tuesday, November 1, 2016 1:11 PM
To: intel-wired-lan at lists.osuosl.org
Subject: [Intel-wired-lan] [PATCH v2] ixgbevf: handle race between close and suspend on shutdown

When an interface is part of a namespace it is possible that
ixgbevf_close() may be called while ixgbevf_suspend() is running which ends up in a double free WARN and/or a BUG in free_msi_irqs()

To handle this situation we extend the rtnl_lock() to protect the call to netif_device_detach() and check for !netif_device_present() to avoid entering close while in suspend.

Also added rtnl locks to ixgbevf_queue_reset_subtask().

-v2 handle the race with netif_device_detach/present() and rtnl locks as suggested by Alex Duyck

CC: Alexander Duyck <alexander.h.duyck at intel.com>
Signed-off-by: Emil Tantilov <emil.s.tantilov at intel.com>
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Tested-by: Krishneil Singh <krishneil.k.singh at intel.com>