diff mbox

[net-next-2.6,3/5] jme: Prevent possible read re-order error

Message ID 1287447044-24471-3-git-send-email-cooldavid@cooldavid.org
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Guo-Fu Tseng Oct. 19, 2010, 12:10 a.m. UTC 
From: Guo-Fu Tseng <cooldavid@cooldavid.org>

Adding read memory barrier in between flag reading and data reading of
receive descriptors. This prevents the data being read before hardware
complete writing informations.

Reported-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Guo-Fu Tseng <cooldavid@cooldavid.org>
---
 drivers/net/jme.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
diff mbox

Patch

diff --git a/drivers/net/jme.c b/drivers/net/jme.c
index 0ea0da3..095f899 100644
--- a/drivers/net/jme.c
+++ b/drivers/net/jme.c
@@ -989,6 +989,7 @@  jme_process_receive(struct jme_adapter *jme, int limit)
 			goto out;
 		--limit;
 
+		rmb();
 		desccnt = rxdesc->descwb.desccnt & RXWBDCNT_DCNT;
 
 		if (unlikely(desccnt > 1 ||