From: Yijing Wang <wangyijing@huawei.com>
Date: Mon, 26 Aug 2013 08:33:06 +0000 (+0800)
Subject: PCI: Warn if unsafe MPS settings detected
X-Git-Tag: v3.12-rc1~177^2~2^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5895af79158a55562753f7f05762f3bd766d32b9;p=pandora-kernel.git

PCI: Warn if unsafe MPS settings detected

If a BIOS configures MPS incorrectly, devices may not work normally.
For example, if a bridge has MPS set larger than an endpoint below it,
the endpoint may discard packets.

To help diagnose this issue, print a warning if we find an endpoint
MPS setting different than that of the upstream bridge.

[bhelgaas: changelog, "bridge" temporary, warning text]
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=60799
Reported-by: Joe Jin <joe.jin@oracle.com>
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Jon Mason <jdmason@kudzu.us>
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