[PATCH 2/3] staging: vt6656: Add comment and change macro to function

[Philipp Hortmann <philipp.g.hortmann@xxxxxxxxx>]

This patch fixes the checkpatch.pl warnings like:
- CHECK: spinlock_t definition without comment
- CHECK: Avoid CamelCase: <uVar>
- CHECK: Macro argument reuse 'uVar' - possible side-effects?
and moved the only twice used macro to a function in the file
where the function is used.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@xxxxxxxxx>
---
 drivers/staging/vt6656/device.h | 11 ++---------
 drivers/staging/vt6656/wcmd.c   | 13 +++++++++++--
 2 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/vt6656/device.h b/drivers/staging/vt6656/device.h
index 8b6623a751f0..eb84590d5eeb 100644
--- a/drivers/staging/vt6656/device.h
+++ b/drivers/staging/vt6656/device.h
@@ -268,8 +268,8 @@ struct vnt_private {
 	u32 rx_buf_sz;
 	int mc_list_count;
 
-	spinlock_t lock;
-	struct mutex usb_lock;
+	spinlock_t lock;		/*prepare tx USB URB*/
+	struct mutex usb_lock;		/*USB control messages*/
 
 	unsigned long flags;
 
@@ -381,13 +381,6 @@ struct vnt_private {
 	struct ieee80211_low_level_stats low_stats;
 };
 
-#define ADD_ONE_WITH_WRAP_AROUND(uVar, uModulo) {	\
-	if ((uVar) >= ((uModulo) - 1))			\
-		(uVar) = 0;				\
-	else						\
-		(uVar)++;				\
-}
-
 int vnt_init(struct vnt_private *priv);
 
 #endif
diff --git a/drivers/staging/vt6656/wcmd.c b/drivers/staging/vt6656/wcmd.c
index e8ee2fbee76c..77c6d898f660 100644
--- a/drivers/staging/vt6656/wcmd.c
+++ b/drivers/staging/vt6656/wcmd.c
@@ -31,6 +31,15 @@ static void vnt_cmd_timer_wait(struct vnt_private *priv, unsigned long msecs)
 	schedule_delayed_work(&priv->run_command_work, msecs_to_jiffies(msecs));
 }
 
+static u32 add_one_with_wrap_around(u32 u_var, u8 u_modulo)
+{
+	if (u_var >= (u_modulo - 1))
+		u_var = 0;
+	else
+		u_var++;
+	return u_var;
+}
+
 static int vnt_cmd_complete(struct vnt_private *priv)
 {
 	priv->command_state = WLAN_CMD_IDLE;
@@ -42,7 +51,7 @@ static int vnt_cmd_complete(struct vnt_private *priv)
 
 	priv->command = priv->cmd_queue[priv->cmd_dequeue_idx];
 
-	ADD_ONE_WITH_WRAP_AROUND(priv->cmd_dequeue_idx, CMD_Q_SIZE);
+	priv->cmd_dequeue_idx = add_one_with_wrap_around(priv->cmd_dequeue_idx, CMD_Q_SIZE);
 	priv->free_cmd_queue++;
 	priv->cmd_running = true;
 
@@ -157,7 +166,7 @@ int vnt_schedule_command(struct vnt_private *priv, enum vnt_cmd command)
 
 	priv->cmd_queue[priv->cmd_enqueue_idx] = command;
 
-	ADD_ONE_WITH_WRAP_AROUND(priv->cmd_enqueue_idx, CMD_Q_SIZE);
+	priv->cmd_enqueue_idx = add_one_with_wrap_around(priv->cmd_enqueue_idx, CMD_Q_SIZE);
 	priv->free_cmd_queue--;
 
 	if (!priv->cmd_running)
-- 
2.25.1