linux-kernel - [PATCH 3.16 086/133] mac80211: flush hw_roc

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Date:   Wed, 22 Nov 2017 01:58:13 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Avraham Stern" <avraham.stern@...el.com>,
        "Luca Coelho" <luciano.coelho@...el.com>,
        "Johannes Berg" <johannes.berg@...el.com>
Subject: [PATCH 3.16 086/133] mac80211: flush hw_roc_start work before
 cancelling the ROC

3.16.51-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Avraham Stern <avraham.stern@...el.com>

commit 6e46d8ce894374fc135c96a8d1057c6af1fef237 upstream.

When HW ROC is supported it is possible that after the HW notified
that the ROC has started, the ROC was cancelled and another ROC was
added while the hw_roc_start worker is waiting on the mutex (since
cancelling the ROC and adding another one also holds the same mutex).
As a result, the hw_roc_start worker will continue to run after the
new ROC is added but before it is actually started by the HW.
This may result in notifying userspace that the ROC has started before
it actually does, or in case of management tx ROC, in an attempt to
tx while not on the right channel.

In addition, when the driver will notify mac80211 that the second ROC
has started, mac80211 will warn that this ROC has already been
notified.

Fix this by flushing the hw_roc_start work before cancelling an ROC.

Signed-off-by: Avraham Stern <avraham.stern@...el.com>
Signed-off-by: Luca Coelho <luciano.coelho@...el.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/mac80211/cfg.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -2891,6 +2891,8 @@ static int ieee80211_cancel_roc(struct i
 	struct ieee80211_roc_work *roc, *tmp, *found = NULL;
 	int ret;

+	flush_work(&local->hw_roc_start);
+
 	mutex_lock(&local->mtx);
 	list_for_each_entry_safe(roc, tmp, &local->roc_list, list) {
 		struct ieee80211_roc_work *dep, *tmp2;