linux-kernel - [PATCH 3.12 56/60] mac80211: flush delayed work when entering suspend

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Message-Id: <d4952005c6054d8c4731ca8c3b5077b3e257e64b.1489497268.git.jslaby@suse.cz>
Date:   Tue, 14 Mar 2017 14:15:47 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Matt Chen <matt.chen@...el.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 56/60] mac80211: flush delayed work when entering suspend

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

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

===============

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: Jiri Slaby <jslaby@...e.cz>
---
 net/mac80211/pm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/mac80211/pm.c b/net/mac80211/pm.c
index efb510e6f206..a1f47b8d8013 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);
 	}
 
-- 
2.12.0