Re: [PATCH v2] Bluetooth: Shutdown controller after workqueues are flushed or cancelled

Hi Mattijs,

On Thu, Aug 5, 2021 at 2:55 PM Mattijs Korpershoek
[off-list ref] wrote:

quoted

Hi Kai-Heng,

Thanks for your patch,

Kai-Heng Feng [off-list ref] writes:

[snipped]

quoted

I confirm this diff works for me:

root@i500-pumpkin:~# hciconfig hci0 up
root@i500-pumpkin:~# hciconfig hci0 down
root@i500-pumpkin:~# hciconfig hci0 up
root@i500-pumpkin:~# hciconfig hci0
hci0:   Type: Primary  Bus: SDIO
        BD Address: 00:0C:E7:55:FF:12  ACL MTU: 1021:8  SCO MTU: 244:4
        UP RUNNING
        RX bytes:11268 acl:0 sco:0 events:829 errors:0
        TX bytes:182569 acl:0 sco:0 commands:829 errors:0

root@i500-pumpkin:~# hcitool scan
Scanning ...
        <redacted>       Pixel 3 XL

Tested-by: Mattijs Korpershoek <redacted>

I found that btmtksdio_flush() only cancels the work instead of doing
flush_work(). That probably explains why putting ->shutdown right
before ->flush doesn't work.
So can you please test the following again:

diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
index 9872ef18f9fea..b33c05ad2150b 100644
--- a/drivers/bluetooth/btmtksdio.c
+++ b/drivers/bluetooth/btmtksdio.c

@@ -649,9 +649,9 @@ static int btmtksdio_flush(struct hci_dev *hdev)
 {
        struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);

-       skb_queue_purge(&bdev->txq);
+       flush_work(&bdev->tx_work);

-       cancel_work_sync(&bdev->tx_work);
+       skb_queue_purge(&bdev->txq);

        return 0;
 }

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 2560ed2f144d4..a61e610a400cb 100644

--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c

@@ -1785,6 +1785,14 @@ int hci_dev_do_close(struct hci_dev *hdev)
        aosp_do_close(hdev);
        msft_do_close(hdev);

+       if (!hci_dev_test_flag(hdev, HCI_UNREGISTER) &&
+           !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
+           test_bit(HCI_UP, &hdev->flags)) {
+               /* Execute vendor specific shutdown routine */
+               if (hdev->shutdown)
+                       hdev->shutdown(hdev);
+       }
+
        if (hdev->flush)
                hdev->flush(hdev);

@@ -1798,14 +1806,6 @@ int hci_dev_do_close(struct hci_dev *hdev)
                clear_bit(HCI_INIT, &hdev->flags);
        }

-       if (!hci_dev_test_flag(hdev, HCI_UNREGISTER) &&
-           !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
-           test_bit(HCI_UP, &hdev->flags)) {
-               /* Execute vendor specific shutdown routine */
-               if (hdev->shutdown)
-                       hdev->shutdown(hdev);
-       }
-
        /* flush cmd  work */
        flush_work(&hdev->cmd_work);