linux-kernel - [PATCH 5.19 106/155] thunderbolt: Check router generation before connecting xHCI

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Date:   Tue,  6 Sep 2022 15:30:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: [PATCH 5.19 106/155] thunderbolt: Check router generation before connecting xHCI

From: Mika Westerberg <mika.westerberg@...ux.intel.com>

commit 93a3c0d4e8bfbb15145e5dd7da68a3de4b904aba upstream.

Only Thunderbolt 3 routers need the xHCI connection flow. This also
ensures the router actually has both lane adapters (1 and 3). While
there move declaration of the boolean variables inside the block where
they are being used.

Fixes: 30a4eca69b76 ("thunderbolt: Add internal xHCI connect flows for Thunderbolt 3 devices")
Cc: stable@...r.kernel.org
Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/thunderbolt/switch.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -3781,14 +3781,18 @@ int tb_switch_pcie_l1_enable(struct tb_s
  */
 int tb_switch_xhci_connect(struct tb_switch *sw)
 {
-	bool usb_port1, usb_port3, xhci_port1, xhci_port3;
 	struct tb_port *port1, *port3;
 	int ret;
 
+	if (sw->generation != 3)
+		return 0;
+
 	port1 = &sw->ports[1];
 	port3 = &sw->ports[3];
 
 	if (tb_switch_is_alpine_ridge(sw)) {
+		bool usb_port1, usb_port3, xhci_port1, xhci_port3;
+
 		usb_port1 = tb_lc_is_usb_plugged(port1);
 		usb_port3 = tb_lc_is_usb_plugged(port3);
 		xhci_port1 = tb_lc_is_xhci_connected(port1);