[PATCH 1/5] net: mediatek: constify ethtool_ops structures

[Julia Lawall]

Check for ethtool_ops structures that are only stored in the ethtool_ops
field of a net_device structure or passed as the second argument to
netdev_set_default_ethtool_ops.  These contexts are declared const, so
ethtool_ops structures that have these properties can be declared as const
also.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct ethtool_ops i at p = { ... };

@ok1@
identifier r.i;
struct net_device e;
position p;
@@
e.ethtool_ops = &i at p;

@ok2@
identifier r.i;
expression e;
position p;
@@
netdev_set_default_ethtool_ops(e, &i at p)

@bad@
position p != {r.p,ok1.p,ok2.p};
identifier r.i;
@@
i at p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct ethtool_ops i = { ... };
// </smpl>

Suggested-by: Stephen Hemminger <stephen at networkplumber.org>

Signed-off-by: Julia Lawall <Julia.Lawall at lip6.fr>

---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 1801fd8..98f22cd 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1692,7 +1692,7 @@ static void mtk_get_ethtool_stats(struct net_device *dev,
 	} while (u64_stats_fetch_retry_irq(&hwstats->syncp, start));
 }
 
-static struct ethtool_ops mtk_ethtool_ops = {
+static const struct ethtool_ops mtk_ethtool_ops = {
 	.get_settings		= mtk_get_settings,
 	.set_settings		= mtk_set_settings,
 	.get_drvinfo		= mtk_get_drvinfo,