RE: [PATCH] pch_gbe: Adding read memory barriers

Under a strong incoming packet stream and/or high cpu usage,
the pch_gbe driver reports "Receive CRC Error" and discards packet.

It occurred on an Intel ATOM E620T while running a 
300mbit/sec multicast
network stream leading to a ~100% cpu usage.

Adding rmb() calls before considering the network card's status solve
this issue.

Getting it into stable would be perfect as it solves 
reliability issues.

Signed-off-by: Erwan Velu <redacted>
---
  .../net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c   |    3 +++
  1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c 

b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
index 8035e5f..ace3654 100644

--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c

@@ -1413,6 +1413,7 @@ static irqreturn_t pch_gbe_intr(int 

irq, void *data)
  			pch_gbe_mac_set_pause_packet(hw);
  		}
  	}
+	smp_rmb(); /* prevent any other reads before*/