linux-kernel - [PATCH 4.15 006/146] mac80211_hwsim: dont use WQ_MEM

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Date:   Tue, 13 Mar 2018 16:22:53 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+41cdaf4232c50e658934@...kaller.appspotmail.com,
        Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 4.15 006/146] mac80211_hwsim: dont use WQ_MEM_RECLAIM

4.15-stable review patch.  If anyone has any objections, please let me know.

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

From: Johannes Berg <johannes.berg@...el.com>

commit ce162bfbc0b601841886965baba14877127c7c7c upstream.

We're obviously not part of a memory reclaim path, so don't set the flag.

This also causes a warning in check_flush_dependency() since we end up
in a code path that flushes a non-reclaim workqueue, and we shouldn't do
that if we were really part of reclaim.

Reported-by: syzbot+41cdaf4232c50e658934@...kaller.appspotmail.com
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/mac80211_hwsim.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -3455,7 +3455,7 @@ static int __init init_mac80211_hwsim(vo
 
 	spin_lock_init(&hwsim_radio_lock);
 
-	hwsim_wq = alloc_workqueue("hwsim_wq",WQ_MEM_RECLAIM,0);
+	hwsim_wq = alloc_workqueue("hwsim_wq", 0, 0);
 	if (!hwsim_wq)
 		return -ENOMEM;