ath9k: add reset for airtime station debugfs

Let user can reset station airtime status by debugfs, it will
reset all airtime deficit to ATH_AIRTIME_QUANTUM and reset rx/tx
airtime accumulate to 0.

Signed-off-by: Louie Lu <git@louie.lu>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/ath/ath9k/debug_sta.c b/drivers/net/wireless/ath/ath9k/debug_sta.c
index ed8b77a..e8fcd3e 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/debug_sta.c
+++ b/drivers/net/wireless/ath/ath9k/debug_sta.c
@@ -286,9 +286,25 @@ static ssize_t read_airtime(struct file *file, char __user *user_buf,
        return retval;
 }
 
+static ssize_t
+write_airtime_reset_stub(struct file *file, const char __user *ubuf,
+                  size_t count, loff_t *ppos)
+{
+       struct ath_node *an = file->private_data;
+       struct ath_airtime_stats *astats;
+       int i;
+
+       astats = &an->airtime_stats;
+       astats->rx_airtime = 0;
+       astats->tx_airtime = 0;
+       for (i = 0; i < 4; i++)
+               an->airtime_deficit[i] = ATH_AIRTIME_QUANTUM;
+       return count;
+}
 
 static const struct file_operations fops_airtime = {
        .read = read_airtime,
+       .write = write_airtime_reset_stub,
        .open = simple_open,
        .owner = THIS_MODULE,
        .llseek = default_llseek,
@@ -304,5 +320,5 @@ void ath9k_sta_add_debugfs(struct ieee80211_hw *hw,
 
        debugfs_create_file("node_aggr", 0444, dir, an, &fops_node_aggr);
        debugfs_create_file("node_recv", 0444, dir, an, &fops_node_recv);
-       debugfs_create_file("airtime", 0444, dir, an, &fops_airtime);
+       debugfs_create_file("airtime", 0644, dir, an, &fops_airtime);
 }