tree 392180002bbc3b399881332d8bf2232a2c3fa274
parent cd4d8fdad1f13205c769266dfa99015e226b6e07
author Don Skidmore <donald.c.skidmore@intel.com> 1235259776 -0800
committer David S. Miller <davem@davemloft.net> 1235259776 -0800

ixgbe: fix for 82598 Si errata causing buffer overflow

The failure happens when an interrupt occurs and the driver is reading
EICR.  This read will cause a clear-by-read which leads to two TLP
being inserted in the PCIe retry buffer leading to an overflow of the
buffer and corruption of TLPs.

The solution is different depending where the reading of EICR takes place.

For ixgbe_msix_lsc() since we are in MSIX mode and know OCD is enabled a
clear-by-write is done instead of the normal clear-by-read.

For ixgbe_intr() 0xffffffff is written to EIMC before the read, masking the
interrupts.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Acked-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>