From: Michal Schmidt <mschmidt@redhat.com>
Date: Mon, 1 Jul 2013 15:23:30 +0000 (+0200)
Subject: ethtool: make .get_dump_data() harder to misuse by drivers
X-Git-Tag: v3.11-rc1~64^2~50
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c590b5e2f05b5e98e614382582b7ae4cddb37599;p=pandora-kernel.git

ethtool: make .get_dump_data() harder to misuse by drivers

As the patch "bnx2x: remove zeroing of dump data buffer" showed,
it is too easy implement .get_dump_data incorrectly in a driver.

Let's make sure drivers cannot get confused by userspace requesting
a too big dump.

Also WARN if the driver sets dump->len to something weird and make
sure the length reported to userspace is the actual length of data
copied to userspace.

Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Reviewed-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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