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From b26cba86bfa2f29841279d7d3950cf1d4db0e6af Mon Sep 17 00:00:00 2001
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: Thu, 25 Nov 2021 12:44:48 -0500
Subject: [PATCH] Bluetooth: virtio_bt: fix device removal
Device removal is clearly out of virtio spec: it attempts to remove
unused buffers from a VQ before invoking device reset. To fix, make
open/close NOPs and do all cleanup/setup in probe/remove.
The cost here is a single skb wasted on an unused bt device - which
seems modest.
NB: with this fix in place driver still suffers from a race condition if
an interrupt triggers while device is being reset. Work on a fix for
that issue is in progress.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Upstream-Status: Submitted [https://lore.kernel.org/all/20211125174200.133230-1-mst@redhat.com/]
---
drivers/bluetooth/virtio_bt.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/drivers/bluetooth/virtio_bt.c b/drivers/bluetooth/virtio_bt.c
index 67c21263f9e0..1dd734aef87b 100644
--- a/drivers/bluetooth/virtio_bt.c
+++ b/drivers/bluetooth/virtio_bt.c
@@ -50,8 +50,11 @@ static int virtbt_add_inbuf(struct virtio_bluetooth *vbt)
static int virtbt_open(struct hci_dev *hdev)
{
- struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
+ return 0;
+}
+static int virtbt_open_vdev(struct virtio_bluetooth *vbt)
+{
if (virtbt_add_inbuf(vbt) < 0)
return -EIO;
@@ -61,7 +64,11 @@ static int virtbt_open(struct hci_dev *hdev)
static int virtbt_close(struct hci_dev *hdev)
{
- struct virtio_bluetooth *vbt = hci_get_drvdata(hdev);
+ return 0;
+}
+
+static int virtbt_close_vdev(struct virtio_bluetooth *vbt)
+{
int i;
cancel_work_sync(&vbt->rx);
@@ -354,8 +361,14 @@ static int virtbt_probe(struct virtio_device *vdev)
goto failed;
}
+ virtio_device_ready(vdev);
+ if (virtbt_open_vdev(vbt))
+ goto open_failed;
+
return 0;
+open_failed:
+ hci_free_dev(hdev);
failed:
vdev->config->del_vqs(vdev);
return err;
@@ -368,6 +381,7 @@ static void virtbt_remove(struct virtio_device *vdev)
hci_unregister_dev(hdev);
virtio_reset_device(vdev);
+ virtbt_close_vdev(vbt);
hci_free_dev(hdev);
vbt->hdev = NULL;
--
2.37.1
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