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[PATCH 1/4] mt76: introduce mt76_{incr,decr} utility routines

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Add mt76_{incr,decr} utility routines to increment/decrement a value
with wrap-around (they will be used by mt76x2 DFS sw detector)

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@xxxxxxxxxx>
---
 drivers/net/wireless/mediatek/mt76/mt76.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index d2166fbf50ff..96e9798bb8a0 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -390,6 +390,18 @@ struct dentry *mt76_register_debugfs(struct mt76_dev *dev);
 int mt76_eeprom_init(struct mt76_dev *dev, int len);
 void mt76_eeprom_override(struct mt76_dev *dev);
 
+/* increment with wrap-around */
+static inline int mt76_incr(int val, int size)
+{
+	return (val + 1) & (size - 1);
+}
+
+/* decrement with wrap-around */
+static inline int mt76_decr(int val, int size)
+{
+	return (val - 1) & (size - 1);
+}
+
 static inline struct ieee80211_txq *
 mtxq_to_txq(struct mt76_txq *mtxq)
 {
-- 
2.17.1




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