From: Bjørn Mork <bjorn@mork.no>
Date: Fri, 22 May 2015 11:15:22 +0000 (+0200)
Subject: cdc_ncm: Fix tx_bytes statistics
X-Git-Tag: omap-for-v4.2/wakeirq-drivers-v2^2~2^2~65^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=44f6731d8b68fa02f5ed65eaceac41f8c3c9279e;p=pandora-kernel.git

cdc_ncm: Fix tx_bytes statistics

The tx_curr_frame_payload field is u32. When we try to calculate a
small negative delta based on it, we end up with a positive integer
close to 2^32 instead.  So the tx_bytes pointer increases by about
2^32 for every transmitted frame.

Fix by calculating the delta as a signed long.

Cc: Ben Hutchings <ben.hutchings@codethink.co.uk>
Reported-by: Florian Bruhin <me@the-compiler.org>
Fixes: 7a1e890e2168 ("usbnet: Fix tx_bytes statistic running backward in cdc_ncm")
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
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