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Dominik Heidler authored
commit 9b3dc0a1 upstream. This fixes a counter problem on 32bit systems: When the rx_bytes counter reached 2 GiB, it jumpd to (2^64 Bytes - 2GiB) Bytes. rtnl_link_stats64 has __u64 type and atomic_long_read returns atomic_long_t which is signed. Due to the conversation we get an incorrect value on 32bit systems if the MSB of the atomic_long_t value is set. CC: Tom Parkin <tparkin@katalix.com> Fixes: 7b7c0719 ("l2tp: avoid deadlock in l2tp stats update") Signed-off-by: Dominik Heidler <dheidler@suse.de> Signed-off-by: David S. Miller <davem@davemloft.net> [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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