[ 3.5.y.z extended stable ] Patch "iwlwifi: pcie: wake the queue if stopped when being unmapped" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    iwlwifi: pcie: wake the queue if stopped when being unmapped

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From e8e2d0a04eb9ae2c7f47fd01e38f81520b553eb6 Mon Sep 17 00:00:00 2001
From: Emmanuel Grumbach <emmanuel.grumbach at intel.com>
Date: Thu, 13 Jun 2013 13:10:00 +0300
Subject: [PATCH] iwlwifi: pcie: wake the queue if stopped when being unmapped

commit 8a487b1a7432b20ff3f82387a8ce7555a964b44e upstream.

When the queue is unmapped while it was so loaded that
mac80211's was stopped, we need to wake the queue after
having freed all the packets in the queue.
Not doing so can result in weird stuff like:

* run lots of traffic (mac80211's queue gets stopped)
* RFKILL
* de-assert RFKILL
* no traffic

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach at intel.com>
Signed-off-by: Johannes Berg <johannes.berg at intel.com>
[ luis: backported to 3.5: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/net/wireless/iwlwifi/iwl-trans-pcie.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c b/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
index a1fb025..844d0f6 100644
--- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
+++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
@@ -439,6 +439,9 @@ static void iwl_tx_queue_unmap(struct iwl_trans *trans, int txq_id)
 		q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd);
 	}
 	spin_unlock_bh(&txq->lock);
+
+	/* just in case - this queue may have been stopped */
+	iwl_wake_queue(trans, txq);
 }

 /**
--
1.8.1.2