[PATCH net-next v3 1/2] rswitch: Use unsigned int for port related array index

[Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>]

Array index should not be negative, so modify the condition of
rswitch_for_each_enabled_port_continue_reverse() macro, and then
use unsigned int instead.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
 drivers/net/ethernet/renesas/rswitch.c | 10 ++++++----
 drivers/net/ethernet/renesas/rswitch.h |  2 +-
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/renesas/rswitch.c b/drivers/net/ethernet/renesas/rswitch.c
index 112e605f104a..e5a41e7880d8 100644
--- a/drivers/net/ethernet/renesas/rswitch.c
+++ b/drivers/net/ethernet/renesas/rswitch.c
@@ -1405,7 +1405,8 @@ static void rswitch_ether_port_deinit_one(struct rswitch_device *rdev)
 
 static int rswitch_ether_port_init_all(struct rswitch_private *priv)
 {
-	int i, err;
+	unsigned int i;
+	int err;
 
 	rswitch_for_each_enabled_port(priv, i) {
 		err = rswitch_ether_port_init_one(priv->rdev[i]);
@@ -1786,7 +1787,8 @@ static void rswitch_device_free(struct rswitch_private *priv, int index)
 
 static int rswitch_init(struct rswitch_private *priv)
 {
-	int i, err;
+	unsigned int i;
+	int err;
 
 	for (i = 0; i < RSWITCH_NUM_PORTS; i++)
 		rswitch_etha_init(priv, i);
@@ -1816,7 +1818,7 @@ static int rswitch_init(struct rswitch_private *priv)
 	for (i = 0; i < RSWITCH_NUM_PORTS; i++) {
 		err = rswitch_device_alloc(priv, i);
 		if (err < 0) {
-			for (i--; i >= 0; i--)
+			for (; i-- > 0; )
 				rswitch_device_free(priv, i);
 			goto err_device_alloc;
 		}
@@ -1959,7 +1961,7 @@ static int renesas_eth_sw_probe(struct platform_device *pdev)
 
 static void rswitch_deinit(struct rswitch_private *priv)
 {
-	int i;
+	unsigned int i;
 
 	rswitch_gwca_hw_deinit(priv);
 	rcar_gen4_ptp_unregister(priv->ptp_priv);
diff --git a/drivers/net/ethernet/renesas/rswitch.h b/drivers/net/ethernet/renesas/rswitch.h
index 04f49a7a5843..27c9d3872c0e 100644
--- a/drivers/net/ethernet/renesas/rswitch.h
+++ b/drivers/net/ethernet/renesas/rswitch.h
@@ -20,7 +20,7 @@
 		else
 
 #define rswitch_for_each_enabled_port_continue_reverse(priv, i)	\
-	for (i--; i >= 0; i--)					\
+	for (; i-- > 0; )					\
 		if (priv->rdev[i]->disabled)			\
 			continue;				\
 		else
-- 
2.25.1