diff options
Diffstat (limited to 'drivers/usb/host/xhci-ring.c')
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 152daca..4027779 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -311,6 +311,9 @@ static int room_on_ring(struct xhci_hcd *xhci, struct xhci_ring *ring, /* Ring the host controller doorbell after placing a command on the ring */ void xhci_ring_cmd_db(struct xhci_hcd *xhci) { + if (!(xhci->cmd_ring_state & CMD_RING_STATE_RUNNING)) + return; + xhci_dbg(xhci, "// Ding dong!\n"); xhci_writel(xhci, DB_VALUE_HOST, &xhci->dba->doorbell[0]); /* Flush PCI posted writes */ |