[PATCH v2 19/65] staging: wfx: fix __wfx_flush() when drop == false

[Jérôme Pouiller]

From: Jérôme Pouiller <jerome.pouil...@silabs.com>

wfx_tx_queues_clear() only clear not yet sent requests. So, it always
necessary to wait for tx_queue_stats.wait_link_id_empty whatever the
value of "drop" argument.

In add, it is not necessary to return with tx queue locked since all
calls to __wfx_flush() unlock the tx queue just after the call to
__wfx_tx_flush().

Signed-off-by: Jérôme Pouiller <jerome.pouil...@silabs.com>
---
 drivers/staging/wfx/queue.c |  2 --
 drivers/staging/wfx/sta.c   | 42 ++++++++++---------------------------
 2 files changed, 11 insertions(+), 33 deletions(-)

diff --git a/drivers/staging/wfx/queue.c b/drivers/staging/wfx/queue.c
index abfbad7c9f75..92bb9a794f30 100644
--- a/drivers/staging/wfx/queue.c
+++ b/drivers/staging/wfx/queue.c
@@ -31,8 +31,6 @@ void wfx_tx_flush(struct wfx_dev *wdev)
 {
        int ret;
 
-       WARN(!atomic_read(&wdev->tx_lock), "tx_lock is not locked");
-
        // Do not wait for any reply if chip is frozen
        if (wdev->chip_frozen)
                return;
diff --git a/drivers/staging/wfx/sta.c b/drivers/staging/wfx/sta.c
index 0c73691ab736..3d665eef8ba7 100644
--- a/drivers/staging/wfx/sta.c
+++ b/drivers/staging/wfx/sta.c
@@ -343,42 +343,25 @@ int wfx_set_rts_threshold(struct ieee80211_hw *hw, u32 
value)
        return 0;
 }
 
-/* If successful, LOCKS the TX queue! */
 static int __wfx_flush(struct wfx_dev *wdev, bool drop)
 {
-       int ret;
-
        for (;;) {
-               if (drop) {
+               if (drop)
                        wfx_tx_queues_clear(wdev);
-               } else {
-                       ret = wait_event_timeout(
-                               wdev->tx_queue_stats.wait_link_id_empty,
-                               wfx_tx_queues_is_empty(wdev),
-                               2 * HZ);
-               }
-
-               if (!drop && ret <= 0) {
-                       ret = -ETIMEDOUT;
-                       break;
-               }
-               ret = 0;
-
-               wfx_tx_lock_flush(wdev);
-               if (!wfx_tx_queues_is_empty(wdev)) {
-                       /* Highly unlikely: WSM requeued frames. */
-                       wfx_tx_unlock(wdev);
-                       continue;
-               }
-               break;
+               if (wait_event_timeout(wdev->tx_queue_stats.wait_link_id_empty,
+                                      wfx_tx_queues_is_empty(wdev),
+                                      2 * HZ) <= 0)
+                       return -ETIMEDOUT;
+               wfx_tx_flush(wdev);
+               if (wfx_tx_queues_is_empty(wdev))
+                       return 0;
+               dev_warn(wdev->dev, "frames queued while flushing tx queues");
        }
-       return ret;
 }
 
 void wfx_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
                  u32 queues, bool drop)
 {
-       struct wfx_dev *wdev = hw->priv;
        struct wfx_vif *wvif;
 
        if (vif) {
@@ -389,10 +372,8 @@ void wfx_flush(struct ieee80211_hw *hw, struct 
ieee80211_vif *vif,
                    !wvif->enable_beacon)
                        drop = true;
        }
-
        // FIXME: only flush requested vif
-       if (!__wfx_flush(wdev, drop))
-               wfx_tx_unlock(wdev);
+       __wfx_flush(hw->priv, drop);
 }
 
 /* WSM callbacks */
@@ -1046,8 +1027,7 @@ static int wfx_set_tim_impl(struct wfx_vif *wvif, bool 
aid0_bit_set)
        skb = ieee80211_beacon_get_tim(wvif->wdev->hw, wvif->vif,
                                       &tim_offset, &tim_length);
        if (!skb) {
-               if (!__wfx_flush(wvif->wdev, true))
-                       wfx_tx_unlock(wvif->wdev);
+               __wfx_flush(wvif->wdev, true);
                return -ENOENT;
        }
        tim_ptr = skb->data + tim_offset;
-- 
2.25.0

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