From: Eric Dumazet <edumazet@google.com>
Date: Fri, 10 Oct 2014 11:48:17 +0000 (-0700)
Subject: mlx4: fix race accessing page->_count
X-Git-Tag: fixes-against-v3.18-rc2~115^2~1^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=98226208c8a1fe5834e92d827a2a1e8051a17943;p=pandora-kernel.git

mlx4: fix race accessing page->_count

This is illegal to use atomic_set(&page->_count, ...) 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>
Signed-off-by: David S. Miller <davem@davemloft.net>
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