linux-kernel - [PATCH 3.10 168/268] mac80211: flush delayed work when entering suspend

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Message-Id: <1497897167-14556-169-git-send-email-w@1wt.eu>
Date:   Mon, 19 Jun 2017 20:31:07 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Matt Chen <matt.chen@...el.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 168/268] mac80211: flush delayed work when entering suspend

From: Matt Chen <matt.chen@...el.com>

commit a9e9200d8661c1a0be8c39f93deb383dc940de35 upstream.

The issue was found when entering suspend and resume.
It triggers a warning in:
mac80211/key.c: ieee80211_enable_keys()
...
WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
             sdata->crypto_tx_tailroom_pending_dec);
...

It points out sdata->crypto_tx_tailroom_pending_dec isn't cleaned up successfully
in a delayed_work during suspend. Add a flush_delayed_work to fix it.

Signed-off-by: Matt Chen <matt.chen@...el.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/mac80211/pm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/mac80211/pm.c b/net/mac80211/pm.c
index efb510e..a1f47b8 100644
--- a/net/mac80211/pm.c
+++ b/net/mac80211/pm.c
@@ -114,6 +114,7 @@ int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
 			break;
 		}
 
+		flush_delayed_work(&sdata->dec_tailroom_needed_wk);
 		drv_remove_interface(local, sdata);
 	}
 
-- 
2.8.0.rc2.1.gbe9624a