smc91x: Add code to detect errors caused by bad memory timings

Add code to detect errors caused by bad memory timings
Signed-off-by: Tony Lindgren <tony@atomide.com>

drivers/net/smc91x.c

@@ -497,6 +497,11 @@ static inline void  smc_rcv(struct net_device *dev)
 		dev->name, packet_number, status,
 		packet_len, packet_len);
 
+	if (unlikely(packet_len == 0 && !(status & RS_ERRORS))) {
+		printk(KERN_ERR "%s: bad memory timings: rxlen %u status %x\n",
+			dev->name, packet_len, status);
+		status |= RS_TOOSHORT;
+	}
 	back:
 	if (unlikely(packet_len < 6 || status & RS_ERRORS)) {
 		if (status & RS_TOOLONG && packet_len <= (1514 + 4 + 6)) {