ixgbe: delay rx_ring freeing

"cat /proc/net/dev" uses RCU protection only.

Its quite possible we call a driver get_stats() method while device is
dismantling and freeing its data structures.

So get_stats() methods must be very careful not accessing driver private
data without appropriate locking.

In ixgbe case, we access rx_ring pointers. These pointers are freed in
ixgbe_clear_interrupt_scheme() and set to NULL, this can trigger NULL
dereference in ixgbe_get_stats64()

A possible fix is to use RCU locking in ixgbe_get_stats64() and defer
rx_ring freeing after a grace period in ixgbe_clear_interrupt_scheme()

Signed-off-by: Eric Dumazet <[email protected]>
Reported-by: Tantilov, Emil S <[email protected]>
Tested-by: Ross Brattain <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>

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