linux-kernel - [PATCH RTF 3/3] usb: renesas_usbhs: Flush the notify_hotplug

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Message-ID: <20250219161239.1751756-4-claudiu.beznea.uj@bp.renesas.com>
Date: Wed, 19 Feb 2025 18:12:39 +0200
From: Claudiu <claudiu.beznea@...on.dev>
To: gregkh@...uxfoundation.org,
	biju.das.jz@...renesas.com,
	geert+renesas@...der.be,
	yoshihiro.shimoda.uh@...esas.com,
	laurent.pinchart@...asonboard.com,
	phil.edworthy@...esas.com,
	balbi@...com,
	kuninori.morimoto.gx@...esas.com
Cc: claudiu.beznea@...on.dev,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
	stable@...r.kernel.org
Subject: [PATCH RTF 3/3] usb: renesas_usbhs: Flush the notify_hotplug_work

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

When performing continuous unbind/bind operations on the USB drivers
available on the Renesas RZ/G2L SoC, a kernel crash with the message
"Unable to handle kernel NULL pointer dereference at virtual address"
may occur. This issue points to the usbhsc_notify_hotplug() function.

Flush the delayed work to avoid its execution when driver resources are
unavailable.

Fixes: bc57381e6347 ("usb: renesas_usbhs: use delayed_work instead of work_struct")
Cc: stable@...r.kernel.org
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---
 drivers/usb/renesas_usbhs/common.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/renesas_usbhs/common.c b/drivers/usb/renesas_usbhs/common.c
index 6c7857b66a21..4b35ef216125 100644
--- a/drivers/usb/renesas_usbhs/common.c
+++ b/drivers/usb/renesas_usbhs/common.c
@@ -781,6 +781,8 @@ static void usbhs_remove(struct platform_device *pdev)
 
 	dev_dbg(&pdev->dev, "usb remove\n");
 
+	flush_delayed_work(&priv->notify_hotplug_work);
+
 	/* power off */
 	if (!usbhs_get_dparam(priv, runtime_pwctrl))
 		usbhsc_power_ctrl(priv, 0);
-- 
2.43.0