jme: Prevent possible read re-order error · ea192aa89c - Gogs

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>

Guo-Fu Tseng 14 years ago

parent

3ee94018a9

commit

ea192aa89c

1 changed files with 1 additions and 0 deletions

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							+ 1
							
							- 0
						
drivers/net/jme.c
							 
								View File
							
				@@ -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 ||