This is a note to let you know that I've just added the patch titled
mac80211: properly flush delayed scan work on interface removal
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mac80211-properly-flush-delayed-scan-work-on-interface-removal.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 46238845bd609a5c0fbe076e1b82b4c5b33360b2 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Date: Tue, 21 Oct 2014 20:56:42 +0200
Subject: mac80211: properly flush delayed scan work on interface removal
From: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
commit 46238845bd609a5c0fbe076e1b82b4c5b33360b2 upstream.
When an interface is deleted, an ongoing hardware scan is canceled and
the driver must abort the scan, at the very least reporting completion
while the interface is removed.
However, if it scheduled the work that might only run after everything
is said and done, which leads to cfg80211 warning that the scan isn't
reported as finished yet; this is no fault of the driver, it already
did, but mac80211 hasn't processed it.
To fix this situation, flush the delayed work when the interface being
removed is the one that was executing the scan.
Reported-by: Sujith Manoharan <sujith@xxxxxxxxxxx>
Tested-by: Sujith Manoharan <sujith@xxxxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/mac80211/iface.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -760,10 +760,12 @@ static void ieee80211_do_stop(struct iee
int i, flushed;
struct ps_data *ps;
struct cfg80211_chan_def chandef;
+ bool cancel_scan;
clear_bit(SDATA_STATE_RUNNING, &sdata->state);
- if (rcu_access_pointer(local->scan_sdata) == sdata)
+ cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
+ if (cancel_scan)
ieee80211_scan_cancel(local);
/*
@@ -973,6 +975,9 @@ static void ieee80211_do_stop(struct iee
ieee80211_recalc_ps(local, -1);
+ if (cancel_scan)
+ flush_delayed_work(&local->scan_work);
+
if (local->open_count == 0) {
ieee80211_stop_device(local);
Patches currently in stable-queue which might be from johannes@xxxxxxxxxxxxxxxx are
queue-3.14/mac80211-properly-flush-delayed-scan-work-on-interface-removal.patch
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