sfc: Hold efx_nic::stats_lock while reading efx_nic::mac_stats

efx_nic::stats_lock is used to serialise stats updates, but each
reader was dropping it before it finished reading efx_nic::mac_stats.

If there were concurrent stats reads using procfs, or one using procfs
and one using ethtool, an update could race with a read.  On a 32-bit
system, the reader could see word-tearing of 64-bit stats (32 bits of
the old value and 32 bits of the new).

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

drivers/net/ethernet/sfc/net_driver.h

@@ -704,6 +704,7 @@ struct efx_filter_state;
  *	can provide.  Generic code converts these into a standard
  *	&struct net_device_stats.
  * @stats_lock: Statistics update lock. Serialises statistics fetches
+ *	and access to @mac_stats.
  *
  * This is stored in the private area of the &struct net_device.
  */