linux-kernel - [PATCH] usb: dwc3: gadget: remove warning during kernel boot

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Date: Tue, 20 Feb 2024 16:12:04 +0800
From: Ray Chi <raychi@...gle.com>
To: Thinh.Nguyen@...opsys.com, gregkh@...uxfoundation.org, 
	quic_uaggarwa@...cinc.com
Cc: albertccwang@...gle.com, linux-usb@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Ray Chi <raychi@...gle.com>, stable@...r.kernel.org
Subject: [PATCH] usb: dwc3: gadget: remove warning during kernel boot

The dwc3->gadget_driver is not initialized during the dwc3 probe
process. This leads to a warning when the runtime power management (PM)
attempts to suspend the gadget using dwc3_gadget_suspend().

This patch adds a check to prevent the warning.

Cc: stable@...r.kernel.org
Fixes: 61a348857e86 ("usb: dwc3: gadget: Fix NULL pointer dereference in dwc3_gadget_suspend")
Signed-off-by: Ray Chi <raychi@...gle.com>
---
 drivers/usb/dwc3/gadget.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 28f49400f3e8..de987cffe1ec 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -4708,6 +4708,9 @@ int dwc3_gadget_suspend(struct dwc3 *dwc)
 	unsigned long flags;
 	int ret;
 
+	if (!dwc->gadget_driver)
+		return 0;
+
 	ret = dwc3_gadget_soft_disconnect(dwc);
 	if (ret)
 		goto err;
-- 
2.44.0.rc0.258.g7320e95886-goog