xhci: dbc: Flush queued requests before stopping dbc

commit efe3e3ae5a66cb38ef29c909e951b4039044bae9 upstream.

Flush dbc requests when dbc is stopped and transfer rings are freed.
Failure to flush them lead to leaking memory and dbc completing odd
requests after resuming from suspend, leading to error messages such as:

[   95.344392] xhci_hcd 0000:00:0d.0: no matched request

Cc: stable <stable@kernel.org>
Fixes: dfba2174dc42 ("usb: xhci: Add DbC support in xHCI driver")
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20250627144127.3889714-5-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c
index c88293f55c4db560c1c00d31d30d3b87d7704721..1091f6fd14c9fd3bbe9391fa16bb0caa86fed2b4 100644 (file)
--- a/drivers/usb/host/xhci-dbgcap.c
+++ b/drivers/usb/host/xhci-dbgcap.c
@@ -639,6 +639,10 @@ static void xhci_dbc_stop(struct xhci_dbc *dbc)
        case DS_DISABLED:
                return;
        case DS_CONFIGURED:
+               spin_lock(&dbc->lock);
+               xhci_dbc_flush_requests(dbc);
+               spin_unlock(&dbc->lock);
+
                if (dbc->driver->disconnect)
                        dbc->driver->disconnect(dbc);
                break;