linux-kernel - [PATCH 3.12 152/182] iwlwifi: dvm: take mutex when sending SYNC BT config command

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Message-Id: <52b4d8aa6be6766b88187b92b18aced0d9c27619.1399973152.git.jslaby@suse.cz>
Date:	Tue, 13 May 2014 11:28:24 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 152/182] iwlwifi: dvm: take mutex when sending SYNC BT config command

From: Emmanuel Grumbach <emmanuel.grumbach@...el.com>

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

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

commit 82e5a649453a3cf23516277abb84273768a1592b upstream.

There is a flow in which we send the host command in SYNC
mode, but we don't take priv->mutex.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1046495

Reviewed-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/net/wireless/iwlwifi/dvm/main.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/iwlwifi/dvm/main.c b/drivers/net/wireless/iwlwifi/dvm/main.c
index 7aad766865cf..ca9c4f1f9b0a 100644
--- a/drivers/net/wireless/iwlwifi/dvm/main.c
+++ b/drivers/net/wireless/iwlwifi/dvm/main.c
@@ -252,13 +252,17 @@ static void iwl_bg_bt_runtime_config(struct work_struct *work)
 	struct iwl_priv *priv =
 		container_of(work, struct iwl_priv, bt_runtime_config);
 
+	mutex_lock(&priv->mutex);
 	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
-		return;
+		goto out;
 
 	/* dont send host command if rf-kill is on */
 	if (!iwl_is_ready_rf(priv))
-		return;
+		goto out;
+
 	iwlagn_send_advance_bt_config(priv);
+out:
+	mutex_unlock(&priv->mutex);
 }
 
 static void iwl_bg_bt_full_concurrency(struct work_struct *work)
-- 
1.9.3

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