tree 20fb5b9194982ff50d6795dc435dd8e09264233e
parent a94c248113b86bbbc47d027a4004b70f2be298b1
author Benjamin Li <benli@broadcom.com> 1215021544 -0700
committer Jesse Barnes <jbarnes@virtuousgeek.org> 1215023154 -0700

PCI: Limit VPD read/write lengths for Broadcom 5706, 5708, 5709 rev.

For Broadcom 5706, 5708, 5709 rev. A nics, any read beyond the
VPD end tag will hang the device.  This problem was initially
observed when a vpd entry was created in sysfs
('/sys/bus/pci/devices/<id>/vpd').   A read to this sysfs entry
will dump 32k of data.  Reading a full 32k will cause an access
beyond the VPD end tag causing the device to hang.  Once the device
is hung, the bnx2 driver will not be able to reset the device.
We believe that it is legal to read beyond the end tag and
therefore the solution is to limit the read/write length.

A majority of this patch is from Matthew Wilcox who gave code for
reworking the PCI vpd size information.  A PCI quirk added for the
Broadcom NIC's to limit the read/write's.

Signed-off-by: Benjamin Li <benli@broadcom.com>
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>