netdev - [PATCH 29/32] staging: wfx: wfx_flush() did not ensure that frames are processed

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Date:   Wed,  1 Apr 2020 13:04:02 +0200
From:   Jerome Pouiller <Jerome.Pouiller@...abs.com>
To:     devel@...verdev.osuosl.org, linux-wireless@...r.kernel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jérôme Pouiller 
        <jerome.pouiller@...abs.com>
Subject: [PATCH 29/32] staging: wfx: wfx_flush() did not ensure that frames are processed

From: Jérôme Pouiller <jerome.pouiller@...abs.com>

wfx_flush() exited once all frames are retrieved from the device.
However, it did not ensure they were processed by driver before to
return. Therefore, some frame may be processed after the interface has
disappear.

Change the place we signal that the queue is empty to fix that.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
---
 drivers/staging/wfx/bh.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/wfx/bh.c b/drivers/staging/wfx/bh.c
index 9fcab00a3733..ba7fa0a7cd9a 100644
--- a/drivers/staging/wfx/bh.c
+++ b/drivers/staging/wfx/bh.c
@@ -108,8 +108,6 @@ static int rx_helper(struct wfx_dev *wdev, size_t read_len, int *is_cnf)
 			release_count = 1;
 		WARN(wdev->hif.tx_buffers_used < release_count, "corrupted buffer counter");
 		wdev->hif.tx_buffers_used -= release_count;
-		if (!wdev->hif.tx_buffers_used)
-			wake_up(&wdev->hif.tx_buffers_empty);
 	}
 	_trace_hif_recv(hif, wdev->hif.tx_buffers_used);
 
@@ -123,6 +121,8 @@ static int rx_helper(struct wfx_dev *wdev, size_t read_len, int *is_cnf)
 	skb_put(skb, hif->len);
 	// wfx_handle_rx takes care on SKB livetime
 	wfx_handle_rx(wdev, skb);
+	if (!wdev->hif.tx_buffers_used)
+		wake_up(&wdev->hif.tx_buffers_empty);
 
 	return piggyback;
 
-- 
2.25.1