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Date: Wed, 3 Jan 2018 12:35:41 +0100
From: Stanislaw Gruszka <sgruszka@redhat.com>
To: Enrico Mioso <mrkiko.rs@gmail.com>
Cc: linux-wireless@vger.kernel.org,
        Johannes Berg <johannes.berg@intel.com>,
        Daniel Golle <daniel@makrotopia.org>,
        Arnd Bergmann <arnd@arndb.de>, John Crispin <john@phrozen.org>,
        nbd@nbd.name
Subject: Re: ieee80211 phy0: rt2x00queue_write_tx_frame: Error - Dropping
 frame due to full tx queue...?
Message-ID: <20180103113540.GA10306@redhat.com> (sfid-20180103_123548_324482_710BA23E)
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Hi

On Sun, Dec 24, 2017 at 01:19:06PM +0100, Enrico Mioso wrote:
> Unfortunately, the error di appear again. Still, I experienced no stalls.
> But i am starting to think this doesn't happen necessarily when a device is going out of range. Now I think I don't know when this triggers.

<sni>
> Sun Dec 24 10:10:50 2017 authpriv.info dropbear[840]: Exit (root): Disconnect received
> Sun Dec 24 11:04:33 2017 kern.err kernel: [ 1510.616638] ieee80211 phy0: rt2x00queue_write_tx_frame: Error - Dropping frame due to full tx queue 2
> Sun Dec 24 11:04:33 2017 kern.err kernel: [ 1510.626106] ieee80211 phy0: rt2x00queue_write_tx_frame: Error - Dropping frame due to full tx queue 2
> Sun Dec 24 11:04:33 2017 kern.err kernel: [ 1510.635562] ieee80211 phy0: rt2x00queue_write_tx_frame: Error - Dropping frame due to full tx queue 2

I would also try bigger threshold for waking queue like
in below patch for those errors:

diff --git a/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c b/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c
index 357c0941aaad..b8bdf57ed7ea 100644
--- a/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/ralink/rt2x00/rt2x00dev.c
@@ -416,7 +416,7 @@ static void rt2x00lib_clear_entry(struct rt2x00_dev *rt2x00dev,
 	 * before it was stopped.
 	 */
 	spin_lock_bh(&entry->queue->tx_lock);
-	if (!rt2x00queue_threshold(entry->queue))
+	if (rt2x00queue_available(queue) > 2*queue->threshold)
 		rt2x00queue_unpause_queue(entry->queue);
 	spin_unlock_bh(&entry->queue->tx_lock);
 }