linux-kernel - Re: [BUG] 2.6.30-rc4 hid bluetooth not working

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Date:	Fri, 01 May 2009 02:37:00 +0200
From:	"Marc Pignat" <Marc.Pignat@...s.ch>
To:	<marcel@...tmann.org>, <jkosina@...e.cz>
Cc:	<ext-roger.quadros@...ia.com>, <linux-bluetooth@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [BUG] 2.6.30-rc4 hid bluetooth not working

Subject: bluetooth: Fix serialization when adding/deleting connections in hci_sysfs

add_conn and del_conn should be serialized, but flush_workqueue can't be used
by the worker thread on it's own queue, so use flush_work to serialize add_conn
and del_conn against each other.

Signed-off-by: Marc Pignat <marc.pignat@...s.ch>
---

patch against 2.6.30-rc4.


diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
index b7c5108..42695e3 100644
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c
@@ -89,8 +89,8 @@ static void add_conn(struct work_struct *work)
 {
 	struct hci_conn *conn = container_of(work, struct hci_conn, work_add);
 
-	/* ensure previous add/del is complete */
-	flush_workqueue(bluetooth);
+	/* ensure previous del is complete */
+	flush_work(&conn->work_del);
 
 	if (device_add(&conn->dev) < 0) {
 		BT_ERR("Failed to register connection device");
@@ -134,8 +134,8 @@ static void del_conn(struct work_struct *work)
 	struct hci_conn *conn = container_of(work, struct hci_conn, work_del);
 	struct hci_dev *hdev = conn->hdev;
 
-	/* ensure previous add/del is complete */
-	flush_workqueue(bluetooth);
+	/* ensure previous add is complete */
+	flush_work(&conn->work_add);
 
 	while (1) {
 		struct device *dev;

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