tree 25eaf1eae76db5e562eae34d0ea921d03566c8c0
parent 00cd5adb0313f540aa58672d14e764d164586a43
author Eric Dumazet <edumazet@google.com> 1412941696 -0700
committer David S. Miller <davem@davemloft.net> 1412969848 -0400

ixgbe: fix race accessing page->_count

This is illegal to use atomic_set(&page->_count, 2) even if we 'own'
the page. Other entities in the kernel need to use get_page_unless_zero()
to get a reference to the page before testing page properties, so we could
loose a refcount increment.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>