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jme: Prevent possible read re-order error 

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>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Guo-Fu Tseng 2010-10-18 14:10:42 +00:00 committed by David S. Miller
parent 3ee94018a9
commit ea192aa89c
1 changed files with 1 additions and 0 deletions
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drivers/net/jme.c
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@ -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 ||