thunderbolt: Use maximum USB3 link rate when reclaiming if link is not up

If the USB3 link is not up the actual link rate is 0 so when reclaiming
bandwidth we should look at maximum supported link rate instead.

Cc: stable@vger.kernel.org
Fixes: 0bd680cd900c ("thunderbolt: Add USB3 bandwidth management")
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

diff --git a/drivers/thunderbolt/tunnel.c b/drivers/thunderbolt/tunnel.c
index 2aae2c76d880dd49074b2e040627523691f3df94..d50e5b93632a7a6620c45f9342aaa4fd49f27475 100644 (file)
--- a/drivers/thunderbolt/tunnel.c
+++ b/drivers/thunderbolt/tunnel.c
@@ -951,10 +951,18 @@ static void tb_usb3_reclaim_available_bandwidth(struct tb_tunnel *tunnel,
        int ret, max_rate, allocate_up, allocate_down;
 
        ret = usb4_usb3_port_actual_link_rate(tunnel->src_port);
-       if (ret <= 0) {
-               tb_tunnel_warn(tunnel, "tunnel is not up\n");
+       if (ret < 0) {
+               tb_tunnel_warn(tunnel, "failed to read actual link rate\n");
                return;
+       } else if (!ret) {
+               /* Use maximum link rate if the link valid is not set */
+               ret = usb4_usb3_port_max_link_rate(tunnel->src_port);
+               if (ret < 0) {
+                       tb_tunnel_warn(tunnel, "failed to read maximum link rate\n");
+                       return;
+               }
        }
+
        /*
         * 90% of the max rate can be allocated for isochronous
         * transfers.