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

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Date: Tue, 20 Feb 2024 09:39:00 +0100
From: Greg KH <gregkh@...uxfoundation.org>
To: Ray Chi <raychi@...gle.com>
Cc: Thinh.Nguyen@...opsys.com, quic_uaggarwa@...cinc.com,
	albertccwang@...gle.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] usb: dwc3: gadget: remove warning during kernel boot

On Tue, Feb 20, 2024 at 04:20:50PM +0800, Ray Chi wrote:
> On Tue, Feb 20, 2024 at 4:12 PM Ray Chi <raychi@...gle.com> wrote:
> >
> > 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
> >
> 
> Attached the warning message.
> 
> 02-20 06:01:24.227725  root    86    86 W Call trace:
> 02-20 06:01:24.227730  root    86    86 W         :
> dwc3_ep0_out_start+0xec/0x22c
> 02-20 06:01:24.227738  root    86    86 W         :
> dwc3_ep0_stall_and_restart+0xb8/0xd4
> 02-20 06:01:24.227747  root    86    86 W         :
> dwc3_gadget_soft_disconnect+0x1a8/0x284
> 02-20 06:01:24.227756  root    86    86 W         :
> dwc3_gadget_suspend+0x18/0xe4
> 02-20 06:01:24.227764  root    86    86 W         :
> dwc3_suspend_common+0x5c/0x320
> 02-20 06:01:24.227774  root    86    86 W         :
> dwc3_runtime_suspend+0x30/0x4c
> 02-20 06:01:24.227783  root    86    86 W         :
> pm_generic_runtime_suspend+0x3c/0x54
> 02-20 06:01:24.227793  root    86    86 W         : __rpm_callback+0xfc/0x76c
> 02-20 06:01:24.227802  root    86    86 W         : rpm_suspend+0x534/0xd78
> 02-20 06:01:24.227811  root    86    86 W         : dwc3_runtime_idle+0xcc/0x104
> 02-20 06:01:24.227819  root    86    86 W         : rpm_idle+0x228/0x4e0
> 02-20 06:01:24.227827  root    86    86 W         : update_autosuspend+0x50/0xb8
> 02-20 06:01:24.227836  root    86    86 W         :
> __pm_runtime_use_autosuspend+0x50/0x6c

That's a kernel warning?  Odd wrapping :(

Can you clean it up a bit and put it in the changelog?  There should be
more info before the "Call trace" portion, right?  What is causing the
warning exactly?

thanks,

greg k-h