[PATCH 1/1] (pre-stable) Bluetooth: Fix HCI_RESET command synchonization

Andy Whitcroft apw at canonical.com
Sun Apr 17 11:35:04 UTC 2011


From: Gustavo F. Padovan <padovan at profusion.mobi>

We can't send new commands before a cmd_complete for the HCI_RESET command
shows up.

Reported-by: Mikko Vinni <mmvinni at yahoo.com>
Reported-by: Justin P. Mattock <justinmattock at gmail.com>
Reported-by: Ed Tomlinson <edt at aei.ca>
Signed-off-by: Gustavo F. Padovan <padovan at profusion.mobi>
Tested-by: Justin P. Mattock <justinmattock at gmail.com>
Tested-by: Mikko Vinni <mmvinni at yahoo.com>
Tested-by: Ed Tomlinson <edt at aei.ca>

backported from commit f630cf0d5434e3923e1b8226ffa2753ead6b0ce5 upstream
[Justin P. Mattock: backported to stable. did not have the time to
compile test this, but patch applies.]
[apw at canonical.com: fixed up missing close brace.]
BugLink: http://bugs.launchpad.net/bugs/700292
Signed-off-by: Andy Whitcroft <apw at canonical.com>
---
 include/net/bluetooth/hci.h |    1 +
 net/bluetooth/hci_core.c    |    5 ++++-
 net/bluetooth/hci_event.c   |    4 +++-
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 29a7a8c..845ab1d 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -74,6 +74,7 @@ enum {
 	HCI_AUTH,
 	HCI_ENCRYPT,
 	HCI_INQUIRY,
+	HCI_RESET,
 
 	HCI_RAW,
 };
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 9c4541b..fa8212b 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -184,6 +184,7 @@ static void hci_reset_req(struct hci_dev *hdev, unsigned long opt)
 	BT_DBG("%s %ld", hdev->name, opt);
 
 	/* Reset device */
+	set_bit(HCI_RESET, &hdev->flags);
 	hci_send_cmd(hdev, HCI_OP_RESET, 0, NULL);
 }
 
@@ -210,8 +211,10 @@ static void hci_init_req(struct hci_dev *hdev, unsigned long opt)
 	/* Mandatory initialization */
 
 	/* Reset */
-	if (!test_bit(HCI_QUIRK_NO_RESET, &hdev->quirks))
+	if (!test_bit(HCI_QUIRK_NO_RESET, &hdev->quirks)) {
+                        set_bit(HCI_RESET, &hdev->flags);
 			hci_send_cmd(hdev, HCI_OP_RESET, 0, NULL);
+	}
 
 	/* Read Local Supported Features */
 	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_FEATURES, 0, NULL);
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index a290854..d2a0bf0 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -183,6 +183,8 @@ static void hci_cc_reset(struct hci_dev *hdev, struct sk_buff *skb)
 
 	BT_DBG("%s status 0x%x", hdev->name, status);
 
+	clear_bit(HCI_RESET, &hdev->flags);
+
 	hci_req_complete(hdev, HCI_OP_RESET, status);
 }
 
@@ -1398,7 +1400,7 @@ static inline void hci_cmd_complete_evt(struct hci_dev *hdev, struct sk_buff *sk
 		break;
 	}
 
-	if (ev->ncmd) {
+	if (ev->ncmd && !test_bit(HCI_RESET, &hdev->flags)) {
 		atomic_set(&hdev->cmd_cnt, 1);
 		if (!skb_queue_empty(&hdev->cmd_q))
 			tasklet_schedule(&hdev->cmd_task);
-- 
1.7.4.1




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