5.4-stable review patch. If anyone has any objections, please let me know.
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From: Claudiu Beznea claudiu.beznea.uj@bp.renesas.com
commit 552ca6b87e3778f3dd5b87842f95138162e16c82 upstream.
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 stable@kernel.org Reviewed-by: Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com Tested-by: Yoshihiro Shimoda yoshihiro.shimoda.uh@renesas.com Signed-off-by: Claudiu Beznea claudiu.beznea.uj@bp.renesas.com Link: https://lore.kernel.org/r/20250225110248.870417-4-claudiu.beznea.uj@bp.renes... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/renesas_usbhs/common.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/usb/renesas_usbhs/common.c +++ b/drivers/usb/renesas_usbhs/common.c @@ -779,6 +779,8 @@ static int usbhs_remove(struct platform_
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);