linux-kernel - [PATCH 4.9 38/63] mac80211: flush delayed work when entering suspend

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Message-Id: <20170313083416.945157264@linuxfoundation.org>
Date:   Mon, 13 Mar 2017 16:39:25 +0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Matt Chen <matt.chen@...el.com>,
        Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 4.9 38/63] mac80211: flush delayed work when entering suspend

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

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

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: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/mac80211/pm.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/mac80211/pm.c
+++ b/net/mac80211/pm.c
@@ -168,6 +168,7 @@ int __ieee80211_suspend(struct ieee80211
 			break;
 		}
 
+		flush_delayed_work(&sdata->dec_tailroom_needed_wk);
 		drv_remove_interface(local, sdata);
 	}