From ce6bb9297c1bab350811d5003526704b9cd79c47 Mon Sep 17 00:00:00 2001 From: Marcel Holtmann Date: Wed, 28 Jan 2015 01:58:40 -0800 Subject: [PATCH] Bluetooth: btusb: Handle out of order firmware loading complete event When loading the Intel firmware it can happen that the firmware loading complete vendor event arrives before the command complete event for the last firmware fragment. < HCI Command: Vendor (0x3f|0x0009) plen 7 01 02 fc 03 00 00 00 > HCI Event: Vendor (0xff) plen 5 06 00 00 00 00 > HCI Event: Command Complete (0x0e) plen 4 Vendor (0x3f|0x0009) ncmd 31 Status: Success (0x00) This is mainly caused by the fact that the vendor command and its command complete event are transported over the bulk endpoints. The firmware loading complete event however is send over the interrupt endpoint. So with just bad timing one event arrives before the other. Currently the code does not account for it. There are precautions for receiving firmware loading complete event quickly, but not for receiving it before the command complete. Introduce an extra flag that tracks when the firmware sending has completed from the driver point of view and track the completion of the firmware loading procedure with a different flag. That way the wakeup can be handled properly. Signed-off-by: Marcel Holtmann Signed-off-by: Johan Hedberg --- drivers/bluetooth/btusb.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 4fac692..25ca93d 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -280,8 +280,9 @@ static const struct usb_device_id blacklist_table[] = { #define BTUSB_DID_ISO_RESUME 4 #define BTUSB_BOOTLOADER 5 #define BTUSB_DOWNLOADING 6 -#define BTUSB_BOOTING 7 +#define BTUSB_FIRMWARE_LOADED 7 #define BTUSB_FIRMWARE_FAILED 8 +#define BTUSB_BOOTING 9 struct btusb_data { struct hci_dev *hdev; @@ -1788,7 +1789,9 @@ static int btusb_recv_event_intel(struct hci_dev *hdev, struct sk_buff *skb) if (skb->data[3] != 0x00) test_bit(BTUSB_FIRMWARE_FAILED, &data->flags); - if (test_and_clear_bit(BTUSB_DOWNLOADING, &data->flags)) + if (test_and_clear_bit(BTUSB_DOWNLOADING, + &data->flags) && + test_bit(BTUSB_FIRMWARE_LOADED, &data->flags)) wake_up_interruptible(&hdev->req_wait_q); } @@ -2151,6 +2154,8 @@ static int btusb_setup_intel_new(struct hci_dev *hdev) fw_ptr += cmd_len; } + set_bit(BTUSB_FIRMWARE_LOADED, &data->flags); + /* Before switching the device into operational mode and with that * booting the loaded firmware, wait for the bootloader notification * that all fragments have been successfully received. -- 2.7.4