thunderbolt: Do not call PM runtime functions in tb_retimer_scan()

We cannot call PM runtime functions in tb_retimer_scan() because it will
also be called when retimers are scanned from userspace (happens when
there is no device connected on ChromeOS for instance) and at the same
USB4 port runtime resume hook. This leads to hang because neither can
proceed.

Fix this by runtime resuming USB4 ports in tb_scan_port() instead. This
makes sure the ports are runtime PM active when retimers are added under
it while avoiding the reported hang as well.

Reported-by: Utkarsh Patel <utkarsh.h.patel@intel.com>
Fixes: 1e56c88adecc ("thunderbolt: Runtime resume USB4 port when retimers are scanned")
Cc: stable@vger.kernel.org
Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

1 files changed, 3 insertions, 14 deletions

diff --git a/drivers/thunderbolt/retimer.c b/drivers/thunderbolt/retimer.c
index 6ebe7a2886ec..56008eb91e2e 100644
--- a/drivers/thunderbolt/retimer.c
+++ b/drivers/thunderbolt/retimer.c
@@ -427,13 +427,6 @@ int tb_retimer_scan(struct tb_port *port, bool add)
 {
 	u32 status[TB_MAX_RETIMER_INDEX + 1] = {};
 	int ret, i, last_idx = 0;
-	struct usb4_port *usb4;
-
-	usb4 = port->usb4;
-	if (!usb4)
-		return 0;
-
-	pm_runtime_get_sync(&usb4->dev);
 
 	/*
 	 * Send broadcast RT to make sure retimer indices facing this
@@ -441,7 +434,7 @@ int tb_retimer_scan(struct tb_port *port, bool add)
 	 */
 	ret = usb4_port_enumerate_retimers(port);
 	if (ret)
-		goto out;
+		return ret;
 
 	/*
 	 * Enable sideband channel for each retimer. We can do this
@@ -471,11 +464,11 @@ int tb_retimer_scan(struct tb_port *port, bool add)
 			break;
 	}
 
-	ret = 0;
 	if (!last_idx)
-		goto out;
+		return 0;
 
 	/* Add on-board retimers if they do not exist already */
+	ret = 0;
 	for (i = 1; i <= last_idx; i++) {
 		struct tb_retimer *rt;
 
@@ -489,10 +482,6 @@ int tb_retimer_scan(struct tb_port *port, bool add)
 		}
 	}
 
-out:
-	pm_runtime_mark_last_busy(&usb4->dev);
-	pm_runtime_put_autosuspend(&usb4->dev);
-
 	return ret;
 }